Lighting system and control method for lighting system

Abstract

To reduce power consumption in a lighting system and improve the responsiveness of control related to turning on a lighting device.SOLUTION: A lighting system includes a plurality of lighting devices, a power feeding device, and a control device. Each lighting device includes a first control unit that controls a circuit that supplies power to a light source, and a first communication unit. The power feeding device supplies power to each lighting device via a power line. The control device includes a second control unit that switches power supply to each lighting device by the power feeding device on and off, and a second communication unit that communicates with the first communication unit of each lighting device. The lighting system includes one or more power storage units. The second control unit alternately sets the power feeding device to a first state and a second state when the light sources of all the lighting devices are not emitting illumination light. In the first state, power is supplied from the power feeding device to each lighting device via a first power line, and each power storage unit stores power. In the second state, power is not supplied from the power feeding device to each lighting device via the first power line, and the one or more power storage units supply power to the first control unit and the first communication unit of each lighting device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a lighting system and a method for controlling a lighting system. [Background technology]

[0002] 2. Description of the Related Art There is a lighting system that includes a plurality of lighting devices and a controller that switches on and off the supply of power to the plurality of lighting devices (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-27762 A [Patent Document 2] JP 2018-6221 A Summary of the Invention [Problem to be solved by the invention]

[0004] Regarding the lighting system, there is room for improvement in terms of reducing power consumption and improving responsiveness in controlling the lighting of lighting devices. [Means for solving the problem]

[0005] A lighting system and a method for controlling a lighting system are disclosed.

[0006] One aspect of the lighting system includes a plurality of lighting devices, a power supply device, and a control device. Each of the plurality of lighting devices has a light source that emits illumination light, a light source drive circuit that supplies power to the light source, a first control unit that controls the light source drive circuit, and a first communication unit. The power supply device supplies power to each of the plurality of lighting devices via a first power line. The control device has a second control unit that controls switching between supplying power to the plurality of lighting devices by the power supply device and a second communication unit that communicates with the first communication unit of each of the plurality of lighting devices. The lighting system includes one or more power storage units electrically connected to the first power line. The second control unit alternately sets the power supply device to a first state and a second state during a standby state in which the light source does not emit illumination light in all of the plurality of lighting devices. The first state is a state in which power is supplied from the power supply device to each of the plurality of lighting devices via the first power line. The second state is a state in which power is not supplied from the power supply device to each of the plurality of lighting devices via the first power line. When the power supply device is set to the first state, each of the one or more power storage units stores power in response to the supply of power from the power supply device via the first power line. When the power supply device is set to the second state, the one or more power storage units supply power to the first control unit and the first communication unit in each of the plurality of lighting devices. When the power supply device is set to the second state, the second control unit sets the power supply device from the second state to the first state before a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of each of the plurality of lighting devices drops to a predetermined first threshold.

[0007] One aspect of the method for controlling a lighting system includes a first step and a second step. The lighting system includes a plurality of lighting devices, a power supply device, and a control device. Each of the plurality of lighting devices includes a light source that emits illumination light, a light source drive circuit that supplies power to the light source, a first control unit that controls the light source drive circuit, and a first communication unit. The power supply device supplies power to each of the plurality of lighting devices via a first power line. The control device includes a second control unit that controls switching between the supply of power to the plurality of lighting devices by the power supply device and the first communication unit of each of the plurality of lighting devices. The lighting system includes one or more power storage units electrically connected to the first power line. The first step and the second step are alternately performed during a standby state in which the light source does not emit illumination light in all of the plurality of lighting devices. The first step is a step in which the power supply device is set to a first state by the second control unit. The second step is a step in which the power supply device is set to a second state by the second control unit. The first state is a state in which power is supplied from the power supply device to each of the plurality of lighting devices via the first power line. The second state is a state in which power is not supplied from the power supply device to each of the plurality of lighting devices via the first power line. In the first step, each of the one or more power storage units stores power in response to the supply of power from the power supply device via the first power line. In the second step, the one or more power storage units supply power to the first control unit and the first communication unit in each of the plurality of lighting devices, and the second control unit transitions from the second step to the first step before a voltage of the power supplied from the one or more power storage units to the first control unit and the first communication unit of each of the plurality of lighting devices drops to a preset first threshold. Effect of the Invention

[0008] In a lighting system, it is possible to reduce power consumption and improve responsiveness in controlling the lighting of lighting devices. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram illustrating an example of an electrical configuration of a lighting system according to a first embodiment. [Diagram 2] FIG. 2 is a diagram illustrating an example of the configuration of a lighting system according to the first embodiment. [Diagram 3] FIG. 3 is a block diagram illustrating an example of an electrical configuration of the lighting device. [Figure 4] FIG. 4 is a block diagram illustrating an example of an electrical configuration of the control device. [Diagram 5] FIG. 5 is a timing chart showing an example of the second power supply operation in the lighting system according to the first embodiment. [Figure 6] FIG. 6 is a flowchart showing an example of an operation flow relating to a power supply control method in a lighting system. [Figure 7] FIG. 7 is a flowchart showing an example of an operation flow relating to a control method of the second power supply operation in the lighting system. [Figure 8] FIG. 8 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the first embodiment. [Figure 9] FIG. 9 is a block diagram illustrating another example of the electrical configuration of the lighting device. [Figure 10] FIG. 10 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the first embodiment. [Figure 11] FIG. 11 is a block diagram illustrating an example of an electrical configuration of a lighting device applied to a lighting system according to the second embodiment. [Figure 12] FIG. 12 is a timing chart showing an example of the second power supply operation in the lighting system according to the second embodiment. [Figure 13] FIG. 13 is a block diagram illustrating another example of the electrical configuration of the lighting device applied to the lighting system according to the second embodiment. [Figure 14]FIG. 14 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the second embodiment. [Figure 15] FIG. 15 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the second embodiment. [Figure 16] FIG. 16 is a block diagram illustrating an example of an electrical configuration of the lighting system according to the second embodiment. [Figure 17] FIG. 17 is a block diagram illustrating an example of an electrical configuration of a lighting system according to the third embodiment. [Figure 18] FIG. 18 is a block diagram illustrating an example of an electrical configuration of a control device applied to a lighting system according to the third embodiment. [Figure 19] FIG. 19 is a timing chart showing an example of the second power supply operation in the lighting system according to the third embodiment. [Figure 20] FIG. 20 is a block diagram illustrating an example of an electrical configuration of the lighting system according to the third embodiment. [Figure 21] FIG. 21 is a block diagram illustrating roughly another example of the electrical configuration of the control device applied to the lighting system according to the third embodiment. [Figure 22] FIG. 22 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the third embodiment. [Diagram 23] FIG. 23 is a block diagram illustrating an example of an electrical configuration of a control device applied to a lighting system according to the fourth embodiment. [Figure 24] FIG. 24 is a timing chart showing an example of the second power supply operation in the lighting system according to the fourth embodiment. [Diagram 25] FIG. 25 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the fourth embodiment. [Figure 26] FIG. 26 is a block diagram illustrating another example of the electrical configuration of the control device applied to the lighting system according to the fourth embodiment. [Figure 27]FIG. 27 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the fourth embodiment. [Figure 28] FIG. 28 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the fourth embodiment. [Figure 29] FIG. 29 is a timing chart showing an example of the second power supply operation in the lighting system according to the fifth embodiment. [Diagram 30] FIG. 30 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the fifth embodiment. [Diagram 31] FIG. 31 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the fifth embodiment. [Diagram 32] FIG. 32 is a block diagram illustrating roughly another example of the electrical configuration of the lighting system according to the fifth embodiment. [Diagram 33] FIG. 33 is a timing chart showing a reference example of the relationship between the timing of turning on a plurality of lighting devices in a lighting system and the current output from a power supply device. [Diagram 34] FIG. 34 is a timing chart showing an example of the relationship between the timing of turning on a plurality of lighting devices in the lighting system according to each embodiment and the current output from the power supply device. [Diagram 35] FIG. 35 is a timing chart showing another example of the relationship between the timing of turning on a plurality of lighting devices in the lighting system according to each embodiment and the current output from the power supply device. [Diagram 36] FIG. 36 is a timing chart showing another example of the relationship between the timing of turning on a plurality of lighting devices in the lighting system according to each embodiment and the current output from the power supply device. [Figure 37] FIG. 37 is a diagram illustrating an example of the configuration of a lighting system. [Figure 38] FIG. 38 is a timing diagram showing an example of the timing of turning on a plurality of lighting devices in a lighting system. [Figure 39]FIG. 39 is a timing diagram showing another example of the lighting timing of a plurality of lighting devices in a lighting system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 2. Description of the Related Art A lighting system including a plurality of lighting devices and a controller that switches on and off the supply of power to the plurality of lighting devices is known.

[0011] As an example of this lighting system, a lighting system including a plurality of lighting devices each including a light-emitting device that emits light and a functional device having an additional function other than the emission of light, and a controller that switches between the supply of power to these lighting devices is considered. For example, a human sensor, a brightness sensor, or an environmental sensor is applied to the functional device. In this lighting system, the controller switches between the supply of power to one or more of the lighting devices based on the operation information of each of the light-emitting device and the functional device, thereby appropriately operating the additional function of the lighting device and reducing the power consumption in the lighting system. Here, various information related to the layout, schedule, or current operation state of the light-emitting device may be applied to the operation information of the light-emitting device. Various information related to the layout, schedule, or current operation state of the functional device may be applied to the operation information of the functional device.

[0012] Also, as an example of a lighting system, a lighting system including a plurality of lighting devices and a plurality of relays that control the supply of power to the plurality of lighting devices is conceivable. In this lighting system, a controller switches the supply of power to the lighting devices by the relays depending on whether various conditions are satisfied, thereby reducing the power consumed by the lighting devices when they are turned off (also called standby power), and thereby reducing the power consumption of the lighting system.

[0013] However, in the above lighting system, for example, when a state in which power is not being supplied to the lighting device is shifted to a state in which power is being supplied to the lighting device, it may take time to start up the microcomputer of the lighting device, etc. Therefore, for example, in a state in which power is not being supplied to the lighting device, it is difficult to quickly start control related to the lighting of the lighting device.

[0014] That is, there is room for improvement in the lighting system in terms of reducing power consumption and improving responsiveness in controlling the lighting of lighting devices.

[0015] In view of this, the inventors of the present disclosure have created a technology for a lighting system that can reduce power consumption and improve responsiveness in controlling the lighting of lighting devices.

[0016] In the following, various embodiments and examples will be described with reference to the drawings. In the drawings, parts having the same or similar configurations and functions are denoted by the same reference numerals. In the following description, duplicated descriptions are omitted.

[0017] <1. First embodiment> <1-1. Lighting system configuration> FIG. 1 is a block diagram that shows an example of an electrical configuration of a lighting system 1 according to a first embodiment. FIG. 2 is a diagram that shows an example of a configuration of the lighting system 1. As shown in FIG. 1, the lighting system 1 includes a plurality of lighting devices 2, a power supply device 3, and a control device 4. In the example of FIG. 1, the lighting system 1 includes three lighting devices 2 as the plurality of lighting devices 2. The plurality of lighting devices 2 is not limited to three lighting devices 2, and may be two lighting devices 2, or any number of lighting devices 2 equal to or greater than four. In the following, as an example, a configuration in which the plurality of lighting devices 2 are three lighting devices 2 will be described. Here, when distinguishing between the three lighting devices 2, the first lighting device 2 may be referred to as the first lighting device 2a, the second lighting device 2 may be referred to as the second lighting device 2b, and the third lighting device 2 may be referred to as the third lighting device 2c. In other words, the plurality of lighting devices 2 includes the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c.

[0018] Further, the lighting system 1 includes one or more power storage units 5. In the example of FIG. 1, the lighting system 1 includes a power storage unit 5 built into each lighting device 2 as one or more power storage units 5. Here, when distinguishing between the power storage units 5 built into each lighting device 2, the first power storage unit 5 built into the first lighting device 2a may be referred to as the 1A power storage unit 5a, the second power storage unit 5 built into the second lighting device 2b may be referred to as the 1B power storage unit 5b, and the third power storage unit 5 built into the third lighting device 2c may be referred to as the 1C power storage unit 5c. In other words, the one or more power storage units 5 include the 1A power storage unit 5a, the 1B power storage unit 5b, and the 1C power storage unit 5c.

[0019] Each lighting device 2 is a device that emits illumination light L1 into an illumination space H1. The illumination space H1 may be, for example, a space within a room of a specific building, or a passage space connecting each room. As shown in FIG. 2, each lighting device 2 may be installed, for example, in an installation space H2 above the ceiling of the illumination space H1. In the example of FIG. 2, each lighting device 2 emits illumination light L1 from the ceiling into the illumination space H1. The power supply device 3 and the control device 4 may be installed, for example, in the installation space H2 above the ceiling of the illumination space H1.

[0020] <1-1-1. Configuration of lighting equipment> Fig. 3 is a block diagram illustrating an example of an electrical configuration of the lighting device 2. As illustrated in Fig. 3, each lighting device 2 has a light source 21, a light source drive circuit 22, a first control unit 23, and a first communication unit 24. Each lighting device 2 may also have a power receiving unit 25 and a power storage unit 5.

[0021] The light source 21 emits illumination light L1. The illumination light L1 may be visible light such as white light. The light source 21 may include a light emitting element such as a light emitting diode (LED), a semiconductor laser element such as a laser diode (LD), a vertical cavity surface emitting laser (VCSEL), or a super luminescent diode (SLD).

[0022] The light source 21 may further include a wavelength conversion member that emits fluorescence. In this structure, the light emitting element of the light source 21 emits excitation light to the wavelength conversion member. The excitation light may be, for example, light having a peak wavelength in a wavelength range from 380 nanometers (nm) to 415 nm. As a specific example, the excitation light may be purple light having a peak wavelength near 405 nm. The excitation light is not necessarily limited to purple light, and may be, for example, blue light having a peak wavelength near 450 nm. The excitation light does not have to be emitted to the illumination space H1.

[0023] The wavelength conversion member includes a phosphor and emits fluorescence as illumination light L1 based on the incident excitation light. The fluorescence has a spectrum different from the spectrum of the excitation light. Specifically, the peak wavelength of the fluorescence is longer than the peak wavelength of the excitation light, and the fluorescence is visible light. The wavelength conversion member is made of a phosphor material that converts the excitation light into blue light, such as BaMgAl 10 O 17 :Eu, (Sr,Ca,Ba) 10 (PO4)6Cl2:Eu, or (Sr,Ba) 10The wavelength conversion member may contain, for example, (Sr,Ba,Ca)5(PO4)3Cl:Eu or Sr4Al as a phosphor material that converts the excitation light into blue-green light. 14 O 25 The wavelength conversion member may contain, for example, SrSi2(O,Cl)2N2:Eu, (Sr,Ba,Mg)2SiO4:Eu, etc. as a phosphor material that converts the excitation light into green light. 2+ , ZnS:Cu,Al, or Zn2SiO4:Mn. The wavelength conversion member may contain, for example, Y2O2S:Eu, Y2O3:Eu, SrCaClAlSiN3:Eu as a phosphor material that converts the excitation light into red light. 2+ , CaAlSiN3:Eu, or CaAlSi(ON)3:Eu. The wavelength conversion member may contain 3Ga5O 12 :Cr, or (Gd x Y (1-x) )3Ga5O 12 :Cr (0≦x≦1). If the wavelength conversion member contains multiple types of phosphor materials corresponding to multiple colors of light, the wavelength conversion member can emit fluorescence with high color rendering. Specifically, if the excitation light is light having a peak wavelength from 380 nm to 415 nm and the wavelength conversion member contains phosphor materials corresponding to the three colors of light of red, green, and blue, the color rendering of the fluorescence can be particularly improved.

[0024] The light source driving circuit 22 is electrically connected to the light source 21. The light source driving circuit 22 supplies power to the light source 21 (more specifically, the light emitting element of the light source 21). The light source 21 emits the illumination light L1 with a light amount corresponding to the power supplied from the light source driving circuit 22. The light source driving circuit 22 is also electrically connected to the first control unit 23. The light source driving circuit 22 is controlled by the first control unit 23. In other words, the first control unit 23 controls the light source driving circuit 22. Specifically, the first control unit 23 outputs a control signal (also called a light source control signal) to the light source driving circuit 22, and the light source driving circuit 22 operates based on this light source control signal. The light source control signal may include, for example, a signal for switching between starting and stopping the emission of the illumination light L1 by the light source 21. Hereinafter, the start of emission of the illumination light L1 by the light source 21 is also referred to as "turning on", and the stop of emission of the illumination light L1 by the light source 21 is also referred to as "turning off". In the following, the state in which the light source 21 emits the illumination light L1 is also referred to as a "light-on state," and the state in which the light source 21 does not emit the illumination light L1 is also referred to as a "light-off state."

[0025] The light source drive circuit 22 may have a mechanism for gradually adjusting the amount of the illumination light L1 (also referred to as a dimming mechanism). The light source drive circuit 22 may include, for example, a dimming circuit and a dimming drive circuit.

[0026] The dimming circuit may be a power supply circuit including a switching element such as a transistor. For example, when the light source 21 includes a current-driven light-emitting element such as an LED, a constant current circuit can be applied as the dimming circuit. The dimming circuit is electrically connected to the light source 21. The dimming circuit outputs a current to the light source 21. The light source 21 emits the illumination light L1 with a light amount corresponding to the value of the current output from the dimming circuit. That is, the light amount of the illumination light L1 emitted by the light source 21 can be adjusted by adjusting the value of the current output by the dimming circuit. The dimming circuit may operate, for example, by a pulse width modulation (PWM) method. The dimming circuit may also be called a light amount control circuit. The light source 21 may also include a voltage-driven light-emitting element. In this structure, for example, a constant voltage circuit can be applied as the dimming circuit, and the dimming circuit outputs a voltage to the light source 21. In the following, as an example, a configuration in which a current-driven light-emitting element is applied to the light source 21 will be described.

[0027] The dimming drive circuit is a circuit for driving the dimming circuit. The dimming drive circuit is electrically connected to the dimming circuit. The dimming drive circuit is also electrically connected to the first control unit 23. The dimming drive circuit receives a signal (also called a dimming signal) for dimming the illumination light L1 emitted by the light source 21 from the first control unit 23. This dimming signal may include, for example, a data signal indicating a target value for the amount of light of the illumination light L1. The dimming drive circuit generates a drive signal according to the data signal, and outputs this drive signal to the dimming circuit. As a more specific example, the dimming drive circuit outputs the drive signal to a control terminal of a switching element of the dimming circuit. The switching element switches between on and off based on the drive signal. The drive signal has a pulse train, and the dimming circuit outputs power to the light source 21 according to a duty ratio, which is the ratio of the on time to one period of the pulse train. The dimming drive circuit adjusts the duty ratio of the drive signal according to the data signal (i.e., the target value of the light amount), so that the switching element of the dimming circuit can be switched on and off based on the duty ratio of the drive signal (i.e., the target value of the light amount). As a result, a current according to the target value of the light amount flows through the light source 21, and the light source 21 can emit the illumination light L1 with the light amount according to the target value. The dimming drive circuit may also be called a light amount driver.

[0028] The dimming drive circuit may generate a drive signal based on, for example, a comparison between a target value of the light amount and a triangular wave. The triangular wave may be generated by, for example, a timer circuit (not shown) included in the dimming drive circuit. The function of generating a drive signal in the dimming drive circuit does not necessarily need to be realized by a circuit separate from the first control unit 23, and may be realized by the first control unit 23. In other words, the first control unit 23 may have the function of the dimming drive circuit. In this structure, the first control unit 23 outputs a drive signal to the dimming circuit.

[0029] The first control unit 23 is an electronic circuit. The first control unit 23 includes, for example, a first processing circuit 231 and a first storage unit 232.

[0030] The first processing circuit 231 may be, for example, a processing circuit such as a central processing unit (CPU). The first storage unit 232 includes, for example, a non-transient storage medium that the first processing circuit 231 can read. This storage medium includes, for example, a non-volatile storage medium such as a ROM (Read Only Memory) and a volatile storage medium such as a RAM (Random Access Memory). The first storage unit 232 stores a program such as a control program in a non-volatile storage medium. The first storage unit 232 can function as a working memory for the first processing circuit 231 by the volatile storage medium. The first processing circuit 231 and the first storage unit 232 are electrically connected to each other by wiring such as a bus. The control program is, for example, firmware. The control program may, for example, define a control operation by the first processing circuit 231 regarding the control of the light source 21. The first processing circuit 231 can read out the control program from the non-volatile storage medium of the first storage unit 232 and execute the control program while using the volatile storage medium of the first storage unit 232 as a working memory. The first processing circuit 231 operates according to the control operation of the control program, thereby enabling the first control unit 23 to control the light source 21.

[0031] The first processing circuit 231 and the first storage unit 232 may be implemented in a single chip, for example. The first control unit 23 may also be called an embedded processor.

[0032] The first control unit 23 may turn on the light source 21 based on, for example, a control signal (also referred to as a lighting control signal) from the control device 4 instructing the lighting of the light source 21. The first control unit 23 may turn off the light source 21 based on, for example, a control signal (also referred to as a lighting control signal) from the control device 4 instructing the turning off of the light source 21. The first control unit 23 may change the amount of light of the illumination light L1 emitted from the light source 21 based on, for example, a control signal (also referred to as a dimming control signal) from the control device 4 instructing the dimming of the illumination light L1 emitted by the light source 21.

[0033] The first communication unit 24 is a communication circuit. This first communication unit 24 can transmit and receive signals to and from the control device 4 via the first communication line Ln1. The first communication unit 24 may be, for example, a communication IC (Integrated Circuit). The first communication unit 24 may also be called a communication interface. The communication standard of the first communication unit 24 is not particularly limited, but may be, for example, a communication standard for serial communication with a communication speed of less than 1 megabit per second (Mbps). The first communication line Ln1 is not particularly limited, but may have, for example, two signal lines for serial communication. The first communication unit 24 is electrically connected to the first control unit 23. The first communication unit 24 receives a transmission signal from the first control unit 23 and performs various processes on the transmission signal according to the communication standard. The first communication unit 24 transmits the processed transmission signal to the control device 4, for example, via the first communication line Ln1. On the other hand, the first communication unit 24 receives a signal from the control device 4 through the first communication line Ln1, and performs various signal processing on the received signal according to the communication standard. The first communication unit 24 outputs the processed received signal to the first control unit 23. This operation allows communication between the lighting device 2 and the control device 4. The control program stored in the first storage unit 232 may define a communication operation with the control device 4 through the first communication unit 24. This allows the first control unit 23 to transmit and receive signals to and from the first communication unit 24 while the control program is being executed.

[0034] The power receiving unit 25 is electrically connected to the power supply device 3 by the first power line Lp1. The power receiving unit 25 has, for example, a terminal and a wiring. The power receiving unit 25 can receive power from the power supply device 3 via the first power line Lp1. The power receiving unit 25 is electrically connected to the light source driving circuit 22, the first control unit 23, and the first communication unit 24. Therefore, the power receiving unit 25 can supply power to each of the light source driving circuit 22, the first control unit 23, and the first communication unit 24. The first control unit 23 and the first communication unit 24 may have built-in electronic components such as a voltage regulator that converts the voltage of the power input from the power receiving unit 25 or the like into a voltage (also referred to as a first operating voltage) required for the operation of the first control unit 23 and the first communication unit 24. This first operating voltage may be, for example, 3.3 volts (V).

[0035] The power storage unit 5 is electrically connected to the first power line Lp1. In the example of FIG. 3, the power storage unit 5 is electrically connected to the power receiving unit 25. In this structure, the power storage unit 5 can receive power from the power supply device 3 via the first power line Lp1 and the power receiving unit 25 and store the power. More specifically, the power storage unit 5 can receive DC power from the power supply device 3 via the first power line Lp1 and the power receiving unit 25 and store the DC power. When there is no power supply from the power supply device 3 via the first power line Lp1, the power storage unit 5 can supply the power stored in the power storage unit 5 to the first control unit 23 and the first communication unit 24. More specifically, when there is no power supply from the power supply device 3 via the first power line Lp1, the power storage unit 5 can supply the DC power stored in the power storage unit 5 to the first control unit 23 and the first communication unit 24. The power storage unit 5 may be, for example, a component such as a capacitor that can temporarily store electricity and release the stored electricity. In other words, the power storage unit 5 may be, for example, a component that can charge and discharge electricity such as a capacitor. Here, the positive electrode of the power storage unit 5 is connected to the positive electric wire of the first power line Lp1, and the negative electrode of the power storage unit 5 is connected to the negative electric wire of the first power line Lp1. The power storage unit 5 may be, for example, a storage battery such as a secondary battery.

[0036] <1-1-2. Configuration of power supply device> The power supply device 3 is a device that supplies power to each of the multiple lighting devices 2 via the first power line Lp1. The power supply device 3 is connected to each of the multiple lighting devices 2 via the first power line Lp1. The power supply device 3 may be a device having a converter that converts AC power into DC power. The power supply device 3 may be connected to a power line (also referred to as an external power line) Lp0 for inputting AC power from outside the lighting system 1, and may be connected to a first power line Lp1 as a power line for outputting DC power. The power supply device 3 can convert the AC power input from the external power line Lp0 into DC power by, for example, a converter, and output the DC power to the first power line Lp1. This allows the power supply device 3 to supply DC power to each of the multiple lighting devices 2 via the first power line Lp1. The power supply device 3 can convert, for example, AC power having a predetermined voltage (also referred to as a first input voltage) inputted through an external power line Lp0 into DC power having a predetermined voltage (also referred to as a first output voltage) and supply this first output voltage power through the first power line Lp1 to each of the multiple lighting devices 2. For example, 100 V is applied to the first input voltage, and 12 V is applied to the first output voltage.

[0037] The first power line Lp1 may have, for example, a portion connected to the power supply device 3 and a plurality of portions branched from this portion. Here, when distinguishing between the plurality of portions before and after the branching of the first power line Lp1, the portion of the first power line Lp1 connected to the power supply device 3 may be referred to as the first base power line Lp1o. The portion of the first power line Lp1 connected to the first lighting device 2a may be referred to as the 1A power line Lp1a. The portion of the first power line Lp1 connected to the second lighting device 2b may be referred to as the 1B power line Lp1b. The portion of the first power line Lp1 connected to the third lighting device 2c is referred to as the 1C power line Lp1c. In other words, the first power line Lp1 includes the first base power line Lp1o, the 1A power line Lp1a, the 1B power line Lp1b, and the 1C power line Lp1c.

[0038] Here, for example, the first power line Lp1 may not branch, and the wiring may branch within the power supply device 3. In this case, the power supply device 3 and the first lighting device 2a may be electrically connected by the 1A power line Lp1a. The power supply device 3 and the second lighting device 2b may be electrically connected by the 1B power line Lp1b. The power supply device 3 and the third lighting device 2c may be electrically connected by the 1C power line Lp1c.

[0039] The power supply device 3 has a section (also referred to as a switching section) 31 that selectively sets a state in which the power supply device 3 outputs power to the first power line Lp1 (also referred to as a power output state) and a state in which the power supply device 3 does not output power to the first power line Lp1 (also referred to as a power non-output state). For example, a switching element such as a transistor or a relay may be applied to the switching section 31. For example, the switching section 31 operates based on a control signal (also referred to as a power supply control signal) from the control device 4. In this way, the control device 4 controls switching between the supply of power to the multiple lighting devices 2 by the power supply device 3. Here, for example, when a switching element or a relay constituting the switching section 31 is turned on in response to the power supply control signal from the control device 4, the power supply device 3 may be set to the power output state. Also, for example, when a switching element or a relay constituting the switching section 31 is turned off in response to the power supply control signal from the control device 4, the power supply device 3 may be set to the power non-output state.

[0040] The switching unit 31 may be a part that realizes a function (also called a remote control function) of selectively setting the power supply device 3 to either a power output state or a power non-output state. The switching unit 31 includes, for example, a terminal (more specifically, an external input terminal), wiring and elements that configure the circuit of the power supply device 3, and the like. The external input terminal is also called a remote control terminal. Here, for example, the power supply device 3 can be set to the power non-output state by stopping the operation of the power supply device 3 itself in response to a voltage signal input to the external input terminal. The voltage signal input to the external input terminal may be, for example, a control signal (power supply control signal) from the control device 4, or may be a voltage signal input via a switch that opens and closes in response to a control signal (power supply control signal) from the control device 4. This switch may be included in the switching unit 31, for example. The operation of the power supply device 3 itself may include, for example, conversion from AC power to DC power by a converter. Furthermore, the power supply device 3 is switched from a non-power output state in which the operation of the power supply device 3 itself is stopped to a power output state in response to switching of a voltage signal to the external input terminal. If the power supply device 3 having the above remote control function is adopted, the power consumption of the power supply device 3 can be significantly reduced when the power supply device 3 is set to the non-power output state. As a result, it is possible to significantly reduce the power consumption of the lighting system 1. Note that, for example, a well-known power supply device having a general remote control function can be applied to the power supply device 3 having the remote control function.

[0041] <1-1-3. Configuration of the control device> Fig. 4 is a block diagram illustrating an example of an electrical configuration of the control device 4. As illustrated in Fig. 4, the control device 4 has a second control unit 41 and a second communication unit 42. The control device 4 may also have a power receiving unit 44. The control device 4 may also have a third communication unit 45.

[0042] The second control unit 41 controls the operation of the control device 4. The second control unit 41 is an electronic circuit. The second control unit 41 includes, for example, a second processing circuit 411 and a second storage unit 412.

[0043] The second processing circuit 411 may be, for example, a processing circuit such as a central processing unit (CPU). The second storage unit 412 includes, for example, a non-transient storage medium readable by the second processing circuit 411. This storage medium includes, for example, a non-volatile storage medium such as a ROM, and a volatile storage medium such as a RAM. The second storage unit 412 stores a program such as a control program in a non-volatile storage medium. The second storage unit 412 can function as a working memory for the second processing circuit 411 by the volatile storage medium. The second processing circuit 411 and the second storage unit 412 are electrically connected to each other by wiring such as a bus. The control program is, for example, firmware. The control program may, for example, prescribe the control operations of the multiple lighting devices 2 and the power supply device 3. The second processing circuit 411 can read the control program from the non-volatile storage medium of the second storage unit 412 and execute the control program while using the volatile storage medium of the second storage unit 412 as a working memory. The second processing circuit 411 operates according to the control operations of the control program, so that the second control unit 41 can control each of the plurality of lighting devices 2 and the power supply device 3.

[0044] For example, the second control unit 41 can control switching between the supply of power to the plurality of lighting devices 2 by the power supply device 3. More specifically, the second control unit 41 can selectively set the power supply device 3 to a power output state and a power non-output state by the switching unit 31 by transmitting a power supply control signal to the switching unit 31 of the power supply device 3. Here, for example, the power supply device 3 can be set to the power output state by the switching unit 31 in response to the power supply control signal transmitted from the second control unit 41. Also, for example, the power supply device 3 can be set to the power non-output state by the switching unit 31 in response to the power supply control signal transmitted from the second control unit 41. Here, the power supply control signal may be set to, for example, a signal (also referred to as an on signal) for putting the power supply device 3 into a power output state or a signal (also referred to as an off signal) for putting the power supply device 3 into a power non-output state.

[0045] The second processing circuit 411 and the second storage unit 412 may be implemented in a single chip, for example. In other words, the second control unit 41 may be an embedded processor.

[0046] The second communication unit 42 is a communication circuit. This second communication unit 42 can transmit and receive signals to and from each lighting device 2 via the first communication line Ln1. The second communication unit 42 may be, for example, a communication IC. The second communication unit 42 may also be called a communication interface. Here, the same communication standard as that of the first communication unit 24 is applied to the communication standard of the second communication unit 42. The second communication unit 42 is electrically connected to the second control unit 41. The second communication unit 42 receives a transmission signal from the second control unit 41 and performs various processes on the transmission signal according to the communication standard. The second communication unit 42 transmits the processed transmission signal to the lighting device 2, for example, via the first communication line Ln1. On the other hand, the second communication unit 42 receives a reception signal from the lighting device 2 via the first communication line Ln1 and performs various signal processes on the reception signal according to the communication standard. The second communication unit 42 outputs the processed reception signal to the second control unit 41. This operation allows communication between the lighting device 2 and the control device 4. More specifically, the second communication unit 42 can communicate with the first communication unit 24 of each of the multiple lighting devices 2. The control program stored in the second storage unit 412 may define a communication operation with the lighting device 2 via the second communication unit 42. This allows the second control unit 41 to transmit and receive signals to and from the second communication unit 42 while the control program is being executed.

[0047] Furthermore, the second communication unit 42 can transmit signals such as a power supply control signal to the power supply device 3 via the second communication line Ln2. Here, the second communication unit 42 may be able to transmit and receive signals to and from the power supply device 3 via the second communication line Ln2.

[0048] As shown in FIG. 2 and FIG. 4, the lighting system 1 may further include a wall switch 10. The wall switch 10 may be located on a wall surface of the lighting space H1 in which the plurality of lighting devices 2 are installed. The wall switch 10 may include, for example, a switch for switching the on and off states of the light source 21 in the plurality of lighting devices 2. Here, the wall switch 10 may include, for example, a switch for switching the on and off states of the light source 21 common to all of the plurality of lighting devices 2, or may include a switch for switching the on and off states of the light source 21 for each of the plurality of lighting devices 2. The wall switch 10 may further include, for example, a switch for designating the amount of light of the illumination light L1. Here, the wall switch 10 may include, for example, a switch for designating the amount of light of the illumination light L1 common to all of the plurality of lighting devices 2, or may include a switch for designating the amount of light of the illumination light L1 for each of the plurality of lighting devices 2. The wall switch 10 outputs, for example, a signal indicating the operation state of various switches to the control device 4.

[0049] The second control unit 41 of the control device 4 may generate an instruction signal for the lighting device 2 based on a signal from the wall switch 10, and transmit the instruction signal to the lighting device 2 through the second communication unit 42. For example, a control signal (on control signal) instructing to turn on the light source 21 and a control signal (off control signal) instructing to turn off the light source 21 may be applied as the instruction signal. Furthermore, for example, a control signal (dimming control signal) instructing to dim the illumination light L1 emitted by the light source 21 may be applied as the instruction signal. Here, the wall switch 10 functions as an operation unit for a user to operate the lighting device 2.

[0050] The power receiving unit 44 is electrically connected to the second power line Lp2. Here, the lighting system 1 may include the second power line Lp2. The second power line Lp2 does not connect the power supply device 3 and the control device 4, and supplies power to the control device 4. This allows power to be stably supplied to the control device 4 regardless of the state of the power supply device 3.

[0051] Here, for example, when the second power line Lp2 supplies DC power to the power receiving unit 44, the DC power is supplied to the power receiving unit 44 via the second power line Lp2 from a power supply device including a converter that converts AC power to DC power. In this case, the power receiving unit 44 has, for example, a terminal and a wiring. The power receiving unit 44 receives DC power from the second power line Lp2. The power receiving unit 44 is electrically connected to the second control unit 41 and the second communication unit 42. Therefore, the power receiving unit 44 can supply power to each of the second control unit 41 and the second communication unit 42. This allows the second control unit 41 and the second communication unit 42 of the control device 4 to be stably maintained in an operating state. The second control unit 41 and the second communication unit 42 may have built-in electronic components such as a voltage regulator that converts the voltage of the power input from the power receiving unit 44 or the like into a voltage (also referred to as a second operating voltage) required for the operation of the second control unit 41 and the second communication unit 42. This second operating voltage may be, for example, 3.3 V. Here, when the second power line Lp2 supplies AC power to the power receiving unit 44, the power receiving unit 44 may have a converter that converts the AC power into DC power.

[0052] As shown in FIG. 4, the lighting system 1 may include an operation terminal 9 such as a remote controller. In this case, the control device 4 may have, for example, a third communication unit 45 that performs wireless communication with the operation terminal 9. Here, the third communication unit 45 may be electrically connected to the power receiving unit 44, so that power may be supplied from the power receiving unit 44. In addition, the third communication unit 45 is electrically connected to the second control unit 41, and can perform communication with the operation terminal 9. The operation terminal 9 may include, for example, a switch that switches between a light source 21 in the multiple lighting devices 2 and an off state. Here, the operation terminal 9 may include, for example, a switch that switches between a light source 21 in a light source common to all of the multiple lighting devices 2 and an off state, or may include a switch that switches between a light source 21 in each of the multiple lighting devices 2 and an off state. Furthermore, the operation terminal 9 may include, for example, a switch for specifying the amount of light of the illumination light L1. Here, the operation terminal 9 may include, for example, a switch for designating the light intensity of the illumination light L1 common to all of the plurality of lighting devices 2, or may include a switch for designating the light intensity of the illumination light L1 for each of the plurality of lighting devices 2. The operation terminal 9 outputs, for example, signals indicating the operation states of the various switches to the control device 4.

[0053] The second control unit 41 of the control device 4 may generate an instruction signal for the lighting device 2 based on a signal from the operation terminal 9, and transmit the instruction signal to the lighting device 2 via the second communication unit 42. The instruction signal may include, for example, a turn-on control signal and a turn-off control signal. The instruction signal may further include a dimming control signal. Here, the operation terminal 9 functions as an operation unit for a user to operate the lighting device 2.

[0054] <1-2. Power supply operation when the lighting system is in standby mode> For example, when the light sources 21 in one or more of the multiple lighting devices 2 are in a state where they emit illumination light L1, the lighting system 1 executes a normal power supply operation (also referred to as a first power supply operation) from the power supply device 3 to the multiple lighting devices 2. On the other hand, when the light sources 21 in all of the multiple lighting devices 2 are in a state where they are not emitting illumination light L1 (also referred to as a standby state), the lighting system 1 executes a power supply operation (also referred to as a second power supply operation) different from the first power supply operation from the power supply device 3 to the multiple lighting devices 2 in order to reduce power consumed by the multiple lighting devices 2 (also referred to as standby power).

[0055] The first supply operation may be an operation for maintaining a state in which power is supplied from the power supply device 3 to the plurality of lighting devices 2.

[0056] Fig. 5 is a timing diagram of an example of the second power supply operation in the lighting system 1 according to the first embodiment. In Fig. 5, the horizontal axis indicates time, and from the top to bottom, the solid lines indicate the time changes of each of [i] the state of the power supply control signal transmitted from the second control unit 41 of the control device 4 to the switching unit 31 of the power supply device 3, [ii] the presence or absence of power output from the power supply device 3 to the first power line Lp1, [iii] the voltage (also referred to as the first voltage) of the power supplied to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, [iv] the voltage (also referred to as the second voltage) of the power supplied to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, and [v] the voltage (also referred to as the third voltage) of the power supplied to the first control unit 23 and the first communication unit 24 of the third lighting device 2c. In Fig. 5, for the state of the power supply control signal in [i], "ON" indicates that the power supply control signal is in the state of an on signal, and "OFF" indicates that the power supply control signal is in the state of an off signal.

[0057] As shown in FIG. 5, the power supply control signal is alternately set to an on signal and an off signal. The first period P1 during which the power supply control signal is maintained as an on signal may be, for example, a predetermined time (also referred to as a first predetermined time). The second period P2 during which the power supply control signal is maintained as an off signal may be, for example, a predetermined time (also referred to as a second predetermined time). In the example of FIG. 5, the period from time t0 to time t1, the period from time t2 to time t3, the period from time t4 to time t5, and the period from time t6 to time t7 are each the first period P1. Also, the period from time t1 to time t2, the period from time t3 to time t4, the period from time t5 to time t6, and the period after time t7 are each the second period P2. 5 illustrates four first periods P1 and four second periods P2, but is not limited thereto, and the first period P1 and the second period P2 may be alternately repeated a number of times according to the length of time of the standby state in the lighting system 1. For example, in the lighting system 1, the first period P1 and the second period P2 may be alternately repeated as long as the standby state is maintained.

[0058] As shown in Fig. 5, regarding the presence or absence of power output from the power supply device 3 to the first power line Lp1, the power supply device 3 is set to a power output state in a first period P1 in which the power supply control signal is maintained as an on signal, and the power supply device 3 is set to a power non-output state in a second period P2 in which the power supply control signal is maintained as an off signal. As a result, the power supply device 3 is alternately set to a state (also referred to as a first state) in which the power supply device 3 supplies power to each of the multiple lighting devices 2 via the first power line Lp1, and a state (also referred to as a second state) in which the power supply device 3 does not supply power to each of the multiple lighting devices 2 via the first power line Lp1. In other words, the second control unit 41 of the control device 4 alternately sets the power supply device 3 to the first state and the second state during a standby state in which the light sources 21 in all of the multiple lighting devices 2 do not emit the illumination light L1. 5, the power supply device 3 is set to the first state in the first period P1, and is set to the second state in the second period P2. This causes the power supply device 3 to intermittently supply power to each of the multiple lighting devices 2 via the first power line Lp1.

[0059] 5, in the first period P1, the power supply device 3 supplies power to each of the plurality of lighting devices 2 via the first power line Lp1. Therefore, the voltage of the power supplied to the first control unit 23 and the first communication unit 24 of each lighting device 2 becomes a voltage Vh1 corresponding to the first output voltage of the power supply device 3. More specifically, in the first period P1, the first voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, the second voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, and the third voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the third lighting device 2c each become a voltage Vh1 corresponding to the first output voltage of the power supply device 3.

[0060] Incidentally, for example, when the power supply device 3 is set to the first state, the power supply device 3 also supplies power to each power storage unit 5 via the first power line Lp1. Therefore, when the power supply device 3 is set to the first state, each of the three power storage units 5 as one or more power storage units 5 stores power in response to the supply of power from the power supply device 3 via the first power line Lp1. In the example of FIG. 5, when the power supply device 3 is set to the first state in the first period P1, the 1A power storage unit 5a of the first lighting device 2a stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, the 1B power storage unit 5b of the second lighting device 2b stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, and the 1C power storage unit 5c of the third lighting device 2c stores power in response to the supply of power from the power supply device 3 via the first power line Lp1.

[0061] Also, for example, when the power supply device 3 is set to the second state, the power supply device 3 does not supply power to each lighting device 2 via the first power line Lp1, and does not supply power to each power storage unit 5 via the first power line Lp1. Therefore, each power storage unit 5 may release the stored power. Here, when the power supply device 3 is set to the second state, the three power storage units 5 as the one or more power storage units 5 supply power to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2.

[0062] In the example of FIG. 5, when the power supply device 3 is set to the second state in the second period P2, the 1A power storage unit 5a of the first lighting device 2a supplies power to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, the 1B power storage unit 5b of the second lighting device 2b supplies power to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, and the 1C power storage unit 5c of the third lighting device 2c supplies power to the first control unit 23 and the first communication unit 24 of the third lighting device 2c.

[0063] Here, for example, the three power storage units 5 serving as one or more power storage units 5 release the stored power, and the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2 consume the power. As a result, the voltage of the power supplied from the three power storage units 5 serving as one or more power storage units 5 to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2 gradually decreases. For example, as shown in FIG. 5, in the second period P2, the first voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, the second voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, and the third voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the third lighting device 2c gradually decrease from the voltage Vh1 corresponding to the first output voltage of the power supply device 3.

[0064] Also, for example, when the power supply device 3 is set to the second state, the power supply device 3 is set to the first state from the second state before the voltage of the power supplied from the three power storage units 5 as one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each of the multiple lighting devices 2 drops to a preset threshold (also referred to as a first threshold) Vt1. In other words, when the power supply device 3 is set to the second state, the second control unit 41 of the control device 4 sets the power supply device 3 from the second state to the first state before the voltage of the power supplied from the three power storage units 5 as one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each of the multiple lighting devices 2 drops to the preset first threshold Vt1. For example, a first operating voltage required for the operation of the first control unit 23 and the first communication unit 24 may be applied to the first threshold Vt1.

[0065] 5, when the power supply device 3 is set to the second state in the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the first voltage of the power supplied from the 1A power storage unit 5a of the first lighting device 2a to the first control unit 23 and the first communication unit 24 of the first lighting device 2a drops to the preset first threshold value Vt1. When the power supply device 3 is set to the second state in the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the second voltage of the power supplied from the 1B power storage unit 5b of the second lighting device 2b to the first control unit 23 and the first communication unit 24 of the second lighting device 2b drops to the preset first threshold value Vt1. When the power supply device 3 is set to the second state during the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the third voltage of the power supplied from the first C power storage unit 5c of the third lighting device 2c to the first control unit 23 and the first communication unit 24 of the third lighting device 2c drops to a predetermined first threshold value Vt1.

[0066] This allows the first control unit 23 and the first communication unit 24 of each lighting device 2 to be maintained in operation during the standby state. Thus, each lighting device 2 can quickly receive control signals, such as a lighting control signal and a dimming control signal, from the control device 4 via the first communication unit 24, and can quickly control the lighting of the light source 21 in response to the control signals, such as the lighting control signal and the dimming control signal, via the first control unit 23.

[0067] Here, the first predetermined time of the first period P1 may be set to, for example, a time required for sufficient storage of the three power storage units 5 as the one or more power storage units 5. This first predetermined time may be, for example, about several seconds to several hundred seconds. The second predetermined time of the second period P2 may be set to, for example, a time during which the voltage of the power supplied from the three power storage units 5 as the one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each of the multiple lighting devices 2 does not drop to the first threshold value Vt1. In other words, the second predetermined time of the second period P2 may be set to, for example, a time during which each of the first voltage, the second voltage, and the third voltage does not drop to the first threshold value Vt1. For example, if the first threshold value Vt1 is 3.3V, the second predetermined time of the second period P2 may be set to a time during which the voltage of the power supplied from the three power storage units 5 as the one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each of the multiple lighting devices 2 drops to a predetermined voltage of about 4V to 6V. In other words, the second predetermined time of the second period P2 may be set to a time for each of the first voltage, the second voltage, and the third voltage to drop to a predetermined voltage of about 4 V to 6 V. This second predetermined time may be, for example, about 10 seconds to several hundred seconds. Each of the first predetermined time of the first period P1 and the second predetermined time of the second period P2 may be set based on, for example, design information of the lighting system 1, or may be set based on experimental results using the lighting system 1.

[0068] Here, in the lighting system 1, for example, when the light sources 21 of one or more lighting devices 2 are in a turned-on state, the first supply operation is executed, and the power supply device 3 continues to supply power to each of the multiple lighting devices 2 via the first power line Lp1. As a result, the voltage of the power supplied to the first control unit 23 and the first communication unit 24 of each lighting device 2 can be constant at voltage Vh1 corresponding to the first output voltage of the power supply device 3.

[0069] In contrast, in the lighting system 1, for example, when in a standby state, as described above, the second supply operation is performed to cause the power supply device 3 to intermittently supply power to each of the multiple lighting devices 2 via the first power line Lp1. As a result, during multiple second periods P2 in which the power supply device 3 does not supply power to each of the multiple lighting devices 2 via the first power line Lp1, the voltage of the power supplied to the first control unit 23 and the first communication unit 24 of each lighting device 2 may be lower than the voltage Vh1 corresponding to the first output voltage of the power supply device 3. As a result, the power consumption in the multiple lighting devices 2 may be reduced.

[0070] Therefore, during standby, the first control unit 23 and the first communication unit 24 of each lighting device 2 are maintained in operation, and standby power consumption in the multiple lighting devices 2 can be reduced. Therefore, in the lighting system 1, power consumption can be reduced and responsiveness in control of lighting of the lighting devices 2 can be improved.

[0071] Also, for example, assume that the power supply device 3 is designed to have high power efficiency when the light source 21 of the lighting device 2 is in a light-on state. In this case, as described above, in the lighting system 1, for example, when in a standby state, the power supply device 3 intermittently supplies power to each of the multiple lighting devices 2 via the first power line Lp1. This reduces the time period during which the current output from the power supply device 3 (also referred to as output current) is lower than when the light source 21 of the lighting device 2 is in a light-on state, and the power efficiency of the power supply device 3 can be improved. As a result, the power consumption in the lighting system 1 can be reduced.

[0072] <1-3. Power supply control operation of lighting system> Next, a description will be given of a method for controlling power supply in the lighting system 1. In other words, an example of a method for controlling the lighting system 1 will be described.

[0073] Fig. 6 is a flow chart showing an example of an operation flow relating to a method for controlling power supply in the lighting system 1. The operation flow in Fig. 6 may be referred to as an operation flow relating to a method for controlling the lighting system 1. This operation flow is realized, for example, by executing a control program in the second control unit 41 of the control device 4. Here, for example, the processes from step S1 to step S5 in Fig. 6 are performed in the order described here.

[0074] In step S1, the second control unit 41 determines whether or not all of the lighting devices 2 are set to a standby state in which the light source 21 does not emit the illumination light L1. Here, the second control unit 41 can determine whether or not the lighting devices 2 are set to a standby state based on, for example, the state of transmission of an off control signal and an on control signal to each of the lighting devices 2. More specifically, the second control unit 41 may store, for example, information indicating which of the off control signal and the on control signal was most recently transmitted to each of the lighting devices 2, and determine that the lighting devices 2 are set to a standby state if the lighting devices 2 have most recently transmitted an off control signal. Here, the determination process of step S1 is repeated until the lighting devices 2 are set to a standby state, and when the lighting devices 2 are set to a standby state, the process proceeds to step S2.

[0075] In step S2, the second control unit 41 starts the second power supply operation, and the process proceeds to step S3.

[0076] In step S3, the second control unit 41 determines whether or not the light source 21 of one or more lighting devices 2 among the multiple lighting devices 2 is in a state to be turned on. Here, the second control unit 41 may determine whether or not the light source 21 of one or more lighting devices 2 is in a state to be turned on, for example, based on a signal instructing turning on from the wall switch 10 as an operation unit or the operation terminal 9. Here, the determination process of step S3 is repeated until the light source 21 of one or more lighting devices 2 among the multiple lighting devices 2 is in a state to be turned on, and when the light source 21 of one or more lighting devices 2 among the multiple lighting devices 2 is in a state to be turned on, the process proceeds to step S4.

[0077] In step S4, the second control unit 41 starts the first power supply operation, and the process proceeds to step S5. Here, the second power supply operation is ended and the first power supply operation is started.

[0078] In step S5, the second control unit 41 sets the light sources 21 in one or more of the multiple lighting devices 2 to a turned-on state, and the process returns to step S1. In this step S5, for example, the control device 4 transmits a turn-on control signal to one or more of the multiple lighting devices 2 via the second control unit 41 and the second communication unit 42, thereby turning on the light sources 21 of each of the one or more lighting devices 2.

[0079] Next, a description will be given of a control method for the second power supply operation in the lighting system 1. In other words, an example of a control method for the lighting system 1 will be described.

[0080] Fig. 7 is a flow chart showing an example of an operation flow relating to a control method of the second power supply operation in the lighting system 1. The operation flow in Fig. 7 may be referred to as an operation flow relating to a control method of the lighting system 1. This operation flow is realized, for example, by executing a control program in the second control unit 41 of the control device 4. Here, for example, the processes of steps S11 to S16 in Fig. 7 are performed.

[0081] In step S11, the second control unit 41 sets the power supply device 3 to the first state, and the process proceeds to step S12. Here, for example, the second control unit 41 transmits an ON signal as a power supply control signal to the switching unit 31 of the power supply device 3, thereby causing the switching unit 31 to set the power supply device 3 to a power output state. This sets the power supply device 3 to the first state in which the power supply device 3 supplies power to each of the multiple lighting devices 2 via the first power line Lp1.

[0082] In step S12, the second control unit 41 determines whether or not a first condition is satisfied. Here, the first condition may be, for example, a condition that the time during which the power supply device 3 is maintained in the first state reaches the above-mentioned first predetermined time. In this step S12, if the first condition is not satisfied, the process proceeds to step S13, and if the first condition is satisfied, the process proceeds to step S14.

[0083] In step S13, the second control unit 41 determines whether or not the light source 21 of one or more of the lighting devices 2 is turned on. Here, as in step S3 above, the second control unit 41 may determine whether or not the light source 21 of one or more of the lighting devices 2 is turned on based on, for example, a signal instructing turning on from the wall switch 10 or the operation terminal 9 as an operation unit. In this step S13, if the light source 21 of one or more of the lighting devices 2 is not turned on, the process returns to step S12. On the other hand, in this step S13, if the light source 21 of one or more of the lighting devices 2 is turned on, the operation flow related to the control method of the second power supply operation in FIG. 7 is ended. In this case, as shown in step S4 in FIG. 6, the second power supply operation may be ended and the first power supply operation may be started.

[0084] In step S14, the second control unit 41 sets the power supply device 3 to the second state, and the process proceeds to step S15. Here, for example, the second control unit 41 transmits an OFF signal as a power supply control signal to the switching unit 31 of the power supply device 3, thereby causing the switching unit 31 to set the power supply device 3 to a power non-output state. This sets the power supply device 3 to the second state in which the power supply device 3 does not supply power to each of the multiple lighting devices 2 via the first power line Lp1.

[0085] In step S15, the second control unit 41 determines whether or not the second condition is satisfied. Here, the second condition may be, for example, a condition that the time during which the power supply device 3 is maintained in the second state reaches the above-mentioned second predetermined time. In this step S15, if the second condition is not satisfied, the process proceeds to step S16, and if the second condition is satisfied, the process returns to step S11.

[0086] In step S16, as in step S13 above, the second control unit 41 determines whether the light source 21 of one or more lighting devices 2 among the plurality of lighting devices 2 is turned on. Here, as in steps S3 and S13 above, the second control unit 41 may determine whether the light source 21 of one or more lighting devices 2 is turned on based on a signal instructing turning on from the wall switch 10 or the operation terminal 9 as an operation unit. In this step S16, if the light source 21 of one or more lighting devices 2 among the plurality of lighting devices 2 is not turned on, the process returns to step S15. On the other hand, in this step S16, if the light source 21 of one or more lighting devices 2 among the plurality of lighting devices 2 is turned on, the operation flow related to the control method of the second power supply operation in FIG. 7 is ended. In this case, as shown in step S4 in FIG. 6, the second power supply operation may be ended and the first power supply operation may be started.

[0087] According to the above operation flow, the control method for the lighting system 1 has a first step and a second step that are alternately executed during a standby state in which the light sources 21 of all of the lighting devices 2 are not emitting illumination light L1. The first step is a step in which the second control unit 41 sets the power supply device 3 to the above-mentioned first state. The second step is a step in which the second control unit 41 sets the power supply device 3 to the above-mentioned second state. Here, the first step corresponds to the first period P1 in the example of FIG. 5, and the second step corresponds to the second period P2 in the example of FIG. 5.

[0088] In the first step, since the power supply device 3 is set to the first state, each of the three power storage units 5 as the one or more power storage units 5 stores power in response to the supply of power from the power supply device 3 via the first power line Lp1. Here, for example, in the first step, when the power supply device 3 is set to the first state, the 1A power storage unit 5a of the first lighting device 2a stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, the 1B power storage unit 5b of the second lighting device 2b stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, and the 1C power storage unit 5c of the third lighting device 2c stores power in response to the supply of power from the power supply device 3 via the first power line Lp1.

[0089] In the second step, since the power supply device 3 is set to the second state, the three power storage units 5 as one or more power storage units 5 supply power to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2. Here, for example, when the power supply device 3 is set to the second state in the second step, the power supply device 3 does not supply power to each lighting device 2 via the first power line Lp1, and does not supply power to each power storage unit 5 via the first power line Lp1, so each power storage unit 5 releases the stored power. In the second step, as illustrated in FIG. 5, for example, the second control unit 41 transitions from the second step to the first step before the voltage of the power supplied from the three power storage units 5 as one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each of the multiple lighting devices 2 drops to the preset first threshold value Vt1. More specifically, before the first voltage of the power supplied from the 1A power storage unit 5a of the first lighting device 2a to the first control unit 23 and the first communication unit 24 of the first lighting device 2a drops to the first threshold Vt1 set in advance, the second control unit 41 shifts from the second step to the first step. Before the second voltage of the power supplied from the 1B power storage unit 5b of the second lighting device 2b to the first control unit 23 and the first communication unit 24 of the second lighting device 2b drops to the first threshold Vt1 set in advance, the second control unit 41 shifts from the second step to the first step. Before the third voltage of the power supplied from the 1C power storage unit 5c of the third lighting device 2c to the first control unit 23 and the first communication unit 24 of the third lighting device 2c drops to the first threshold Vt1 set in advance, the second control unit 41 shifts from the second step to the first step.

[0090] As a result, the second power supply operation can maintain the first control unit 23 and the first communication unit 24 of each lighting device 2 in operation in the standby state. Thus, each lighting device 2 can quickly receive control signals such as a lighting control signal and a dimming control signal from the control device 4 by the first communication unit 24, and can quickly control the lighting of the light source 21 in response to the control signals such as the lighting control signal and the dimming control signal by the first control unit 23.

[0091] Furthermore, as described above, by performing the second supply operation, power is intermittently supplied to each of the multiple lighting devices 2 via the first power line Lp1 by the power supply device 3. As a result, in the second step in which power is not supplied to each of the multiple lighting devices 2 via the first power line Lp1 by the power supply device 3, the voltage of the power supplied to the first control unit 23 and the first communication unit 24 of each lighting device 2 may be lower than the voltage Vh1 corresponding to the first output voltage of the power supply device 3, as illustrated in Fig. 5, for example. As a result, the power consumption of the multiple lighting devices 2 may be reduced.

[0092] Therefore, during standby, the first control unit 23 and the first communication unit 24 of each lighting device 2 are maintained in operation, and standby power consumption in the multiple lighting devices 2 can be reduced. Therefore, in the lighting system 1, power consumption can be reduced and responsiveness in control of lighting of the lighting devices 2 can be improved.

[0093] <1-4. Variations in the placement of the power storage unit> In the above description, each lighting device 2 includes the power storage unit 5, but this is not limited to the above. One or more power storage units 5 for supplying power to the first control unit 23 and the first communication unit 24 of each lighting device 2 may be electrically connected to the first power line Lp1 that electrically connects the power supply device 3 and the lighting device 2.

[0094] Fig. 8 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the first embodiment. Fig. 9 is a block diagram illustrating another example of the electrical configuration of the lighting device 2.

[0095] As shown in Fig. 8, the lighting system 1 according to the first embodiment may include, for each of the multiple lighting devices 2, a power storage unit 5 located inside the lighting device 2, or may include a power storage unit 5 located outside the lighting device 2. In Fig. 8, for convenience, the power storage unit 5 located inside the lighting device 2 and the power storage unit 5 located outside the lighting device 2 are drawn by thin dashed lines for each lighting device 2.

[0096] For example, the lighting system 1 may include, for the first lighting device 2a, a firstA power storage unit 5a as a first power storage unit 5 electrically connected to a firstA power line Lp1a as a portion of the first power line Lp1 connected to the first lighting device 2a and located outside the first lighting device 2a. In this case, the firstA power storage unit 5a may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the firstA power line Lp1a.

[0097] For example, the lighting system 1 may include, for the second lighting device 2b, a 1B power storage unit 5b as a second power storage unit 5 electrically connected to a 1B power line Lp1b as a portion of the first power line Lp1 connected to the second lighting device 2b and located outside the second lighting device 2b. In this case, the 1B power storage unit 5b may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the 1B power line Lp1b.

[0098] For example, the lighting system 1 may include, for the third lighting device 2c, a first-cell power storage unit 5c as a third power storage unit 5 electrically connected to a first-cell power line Lp1c as a portion of the first power line Lp1 connected to the third lighting device 2c and located outside the third lighting device 2c. In this case, the first-cell power storage unit 5c may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first-cell power line Lp1c.

[0099] Here, among the plurality of lighting devices 2, the lighting device 2 in which the power storage unit 5 is located may have, for example, the configuration illustrated in Fig. 3. Also, among the plurality of lighting devices 2, the lighting device 2 in which the power storage unit 5 is not located may have, for example, the configuration illustrated in Fig. 9 in which the power storage unit 5 is removed from the lighting device 2 illustrated in Fig. 3.

[0100] FIG. 10 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the first embodiment.

[0101] As shown in FIG. 10, the lighting system 1 according to the first embodiment may include, as one or more power storage units 5, one power storage unit 5 capable of supplying power to each of the plurality of lighting devices 2, instead of including a power storage unit 5 located inside each of the plurality of lighting devices 2. In other words, the lighting system 1 may include, as one or more power storage units 5, one power storage unit 5 common to the plurality of lighting devices 2. In this case, the one power storage unit 5 may be electrically connected to the first base power line Lp1o. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. One power storage unit 5 may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first base power line Lp1o and the first C power line Lp1c. Again, the lighting device 2 may have, for example, the configuration illustrated in FIG.

[0102] <1-5. Summary of the first embodiment> As described above, in both the lighting system 1 and the control method for the lighting system 1 according to the first embodiment, during a standby state in which the light sources 21 in all of the lighting devices 2 do not emit the illumination light L1, the power supply device 3 is alternately set to a first state in which the power supply device 3 supplies power to each of the lighting devices 2 via the first power line Lp1, and a second state in which the power supply device 3 does not supply power to each of the lighting devices 2 via the first power line Lp1. Here, when the power supply device 3 is set to the first state, each of the one or more power storage units 5 stores power in response to the supply of power from the power supply device 3 via the first power line Lp1. When the power supply device 3 is set to the second state, the one or more power storage units 5 supply power to the first control unit 23 and the first communication unit 24 in each of the lighting devices 2. Then, when the power supply device 3 is set to the second state, the second control unit 41 of the control device 4 sets the power supply device 3 from the second state to the first state before the voltage of the power supplied from the one or more power storage units 5 to the first control units 23 and the first communication units 24 of each of the multiple lighting devices 2 drops to a predetermined first threshold value Vt1.

[0103] By adopting this configuration, the first control unit 23 and the first communication unit 24 of each lighting device 2 can be maintained in operation during the standby state. This allows each lighting device 2 to quickly receive control signals such as a lighting control signal and a dimming control signal from the control device 4 by the first communication unit 24. As a result, each lighting device 2 can quickly control the lighting of the light source 21 according to the control signal such as the lighting control signal and the dimming control signal by the first control unit 23. In addition, the power supply device 3 intermittently supplies power to each of the multiple lighting devices 2 via the first power line Lp1, so that the power consumption of the multiple lighting devices 2 can be reduced. Therefore, while the first control unit 23 and the first communication unit 24 of each lighting device 2 are maintained in operation during the standby state, the standby power consumption of the multiple lighting devices 2 can be reduced. Therefore, in the lighting system 1, the power consumption can be reduced and the responsiveness of the control related to the lighting of the lighting devices 2 can be improved.

[0104] <2. Other embodiments> The present disclosure is not limited to the first embodiment described above, and various modifications and improvements are possible without departing from the gist of the present disclosure.

[0105] <2-1. Second embodiment> In the first embodiment, for example, the lighting system 1 may include one or more sensors that detect the voltage of the power supplied from one or more power storage units 5 to the first control unit 23 and the first communication unit 24 in each of the lighting devices 2. Then, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the one or more sensors. In other words, in the above-mentioned control method for the lighting system 1, in the second step, the second control unit 41 may transition from the second step to the first step in response to the voltage detected by the one or more sensors. For example, various voltage sensors may be applied to each of the one or more sensors.

[0106] If this configuration is adopted, the first control unit 23 and the first communication unit 24 of each lighting device 2 can be more stably maintained in operation during standby, while reducing the standby power consumption of the multiple lighting devices 2. Therefore, in the lighting system 1, it is possible to more stably reduce power consumption and improve responsiveness in the control of lighting of the lighting devices 2.

[0107] Fig. 11 is a block diagram showing an example of an electrical configuration of the lighting device 2 applied to the lighting system 1 according to the second embodiment. The lighting device 2 shown in Fig. 11 has a configuration in which a first sensor 6 is added to the lighting device 2 shown in Fig. 3.

[0108] Here, for example, the lighting system 1 may include a plurality of first sensors 6 as one or more sensors. Then, for example, as shown in FIG. 11, each of the plurality of lighting devices 2 may include one of the plurality of first sensors 6. In this way, if each of the plurality of lighting devices 2 includes one first sensor 6, the one first sensor 6 in each of the plurality of lighting devices 2 can detect the voltage of the power supplied from one or more power storage units 5 to the first control unit 23 and the first communication unit 24. For example, various voltage sensors are applied to the first sensor 6. In this case, for example, the first sensor 6 may be electrically connected to the power receiving unit 25 and measure the voltage supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 via the power receiving unit 25.

[0109] Here, the first sensor 6 is electrically connected to, for example, the first control unit 23. The first sensor 6 may transmit a signal related to the voltage as a measurement result to the first control unit 23. The first control unit 23 may transmit a signal related to the voltage measured by the first sensor 6 to the control device 4 via the first communication unit 24. In other words, for example, in each of the plurality of lighting devices 2, the first communication unit 24 may transmit a signal related to the voltage detected by one of the first sensors 6 to the second communication unit 42. In other words, in the above-mentioned control method for the lighting system 1, in each of the plurality of lighting devices 2, in the above-mentioned second step, the first communication unit 24 may transmit a signal related to the voltage detected by one of the first sensors 6 to the second communication unit 42. According to this configuration, in each lighting device 2, a signal related to the voltage detected by the first sensor 6 in the lighting device 2 is transmitted to the control device 4 by the first communication unit 24 in the lighting device 2, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0110] Fig. 12 is a timing diagram showing an example of the second power supply operation in the lighting system 1 according to the second embodiment. The timing diagram in Fig. 12 is based on the timing diagram shown in Fig. 5, and adds straight thin dashed dotted lines indicating the first predetermined value Vp1 for each of the first voltage, the second voltage, and the third voltage.

[0111] Here, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to a voltage detected by the first sensors 6 as one or more sensors dropping to a preset value (also referred to as a first preset value) Vp1. In other words, in the above-mentioned method of controlling the lighting system 1, in the second step, in response to a voltage detected by the first sensors 6 as one or more sensors dropping to a preset first preset value Vp1, the second control unit 41 may transition from the second step to the first step. The first preset value Vp1 may be a value larger than the above-mentioned first threshold value Vt1.

[0112] In this case, the above-mentioned second condition may be, for example, a condition in which the voltage detected by the first sensors 6 as one or more sensors drops to a preset first predetermined value Vp1. The first predetermined value Vp1 may be a value smaller than the voltage Vh1 corresponding to the first output voltage of the power supply device 3. For example, if the first threshold value Vt1 is 3.3 V and the voltage Vh1 is 12 V, a voltage value of about 4 V to 6 V may be applied to the first predetermined value Vp1.

[0113] If this configuration is adopted, the first control unit 23 and the first communication unit 24 of each lighting device 2 can be more stably maintained in operation during standby, while reducing the standby power consumption of the multiple lighting devices 2. Therefore, in the lighting system 1, it is possible to more stably reduce power consumption and improve responsiveness in the control of lighting of the lighting devices 2.

[0114] Here, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the first sensor 6 in one of the multiple lighting devices 2 dropping to a first predetermined value Vp1.

[0115] More specifically, for example, in each of the multiple lighting devices 2, the first control unit 23 may transmit a signal indicating that the voltage detected by the first sensor 6 has dropped to a first predetermined value Vp1 (also referred to as a first signal) as a signal related to the voltage measured by the first sensor 6 to the second communication unit 42 via the first communication unit 24. In this case, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the first signal from the first control unit 23 of any one of the multiple lighting devices 2.

[0116] Also, for example, in each of the plurality of lighting devices 2, the first control unit 23 may transmit a signal (also referred to as a voltage signal) indicating the voltage detected by the first sensor 6 as a signal related to the voltage measured by the first sensor 6 to the second communication unit 42 via the first communication unit 24. In this case, for example, the second control unit 41 can detect that the voltage measured by the first sensor 6 has dropped to a first predetermined value Vp1 based on a voltage signal from the first control unit 23 of any one of the plurality of lighting devices 2 when the power supply device 3 is set to the second state. Then, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the first sensor 6 of any one of the plurality of lighting devices 2 dropping to a first predetermined value Vp1 when the power supply device 3 is set to the second state. Here, the above-mentioned second condition is not limited to the condition that the voltage detected by the plurality of first sensors 6 as one or more sensors has dropped to a first predetermined value Vp1. The second condition may be, for example, a condition in which a predetermined time has elapsed after the voltage detected by a plurality of first sensors 6 as one or more sensors has dropped to a predetermined first predetermined value Vp1.

[0117] In the example of Fig. 11, each lighting device 2 includes a power storage unit 5, but this is not limited thereto. One or more power storage units 5 for supplying power to the first control unit 23 and the first communication unit 24 of each lighting device 2 may be electrically connected to the first power line Lp1 electrically connecting the power supply device 3 and the lighting device 2. Here, as illustrated in Fig. 8, the lighting system 1 according to the second embodiment may include, for example, a power storage unit 5 located inside the lighting device 2 for each of the multiple lighting devices 2, or may include a power storage unit 5 located outside the lighting device 2.

[0118] FIG. 13 is a block diagram illustrating another example of the electrical configuration of the lighting device 2 applied to the lighting system 1 according to the second embodiment.

[0119] Here, among the plurality of lighting devices 2, the lighting device 2 in which the power storage unit 5 is located may have, for example, the configuration illustrated in Fig. 11. Also, among the plurality of lighting devices 2, the lighting device 2 in which the power storage unit 5 is not located may have, for example, the configuration illustrated in Fig. 13 in which the power storage unit 5 is deleted from the lighting device 2 illustrated in Fig. 11.

[0120] In the above description, each lighting device 2 includes the first sensor 6, but this is not limited to the above. For example, the lighting system 1 according to the second embodiment may include a first sensor 6 located outside the lighting device 2 instead of the first sensor 6 located inside the lighting device 2, as long as the lighting system 1 includes a power storage unit 5 located outside the lighting device 2 instead of the power storage unit 5 located inside the lighting device 2.

[0121] FIG. 14 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the second embodiment.

[0122] As shown in FIG. 14, the lighting system 1 according to the second embodiment may, for example, include, for each of a plurality of lighting devices 2, a power storage unit 5 and a first sensor 6 located outside the lighting device 2, instead of a power storage unit 5 and a first sensor 6 located inside the lighting device 2.

[0123] For example, the lighting system 1 may include, for the first lighting device 2a, a first A power storage unit 5a and a first A sensor 6a as a first first sensor 6, which are electrically connected to the first A power line Lp1a and located outside the first lighting device 2a. In this case, the first A sensor 6a may be electrically connected to a portion of the first A power line Lp1a that is closer to the first lighting device 2a than the portion to which the first A power storage unit 5a is electrically connected. This allows the first A sensor 6a to detect the voltage of the power that the first A power storage unit 5a supplies to the first lighting device 2a via the first A power line Lp1a. More specifically, the first A sensor 6a can detect the voltage of the power that the first A power storage unit 5a supplies to the first control unit 23 and the first communication unit 24 of the first lighting device 2a via the first A power line Lp1a. For example, the 1A sensor 6a may directly transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and the first lighting device 2a. In Fig. 14, as an example, a signal line through which the 1A sensor 6a directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0124] For example, the lighting system 1 may include, for the second lighting device 2b, a firstB power storage unit 5b and a firstB sensor 6b as a second first sensor 6, which are electrically connected to the firstB power line Lp1b and located outside the second lighting device 2b. In this case, the firstB sensor 6b may be electrically connected to a portion of the firstB power line Lp1b that is closer to the second lighting device 2b than the portion to which the firstB power storage unit 5b is electrically connected. This allows the firstB sensor 6b to detect the voltage of the power that the firstB power storage unit 5b supplies to the second lighting device 2b via the firstB power line Lp1b. More specifically, the firstB sensor 6b can detect the voltage of the power that the firstB power storage unit 5b supplies to the first control unit 23 and the first communication unit 24 of the second lighting device 2b via the firstB power line Lp1b. The 1B sensor 6b may, for example, directly transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and the second lighting device 2b. In Fig. 14, as an example, a signal line through which the 1B sensor 6b directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted diagrammatically by a thin dashed line.

[0125] For example, the lighting system 1 may include, for the third lighting device 2c, a first-C storage unit 5c and a first-C sensor 6c as a third first sensor 6, which are electrically connected to the first-C power line Lp1c and located outside the third lighting device 2c. In this case, the first-C sensor 6c may be electrically connected to a portion of the first-C power line Lp1c that is closer to the third lighting device 2c than the portion to which the first-C storage unit 5c is electrically connected. This allows the first-C sensor 6c to detect the voltage of the power that the first-C storage unit 5c supplies to the third lighting device 2c via the first-C power line Lp1c. More specifically, the first-C sensor 6c can detect the voltage of the power that the first-C storage unit 5c supplies to the first control unit 23 and the first communication unit 24 of the third lighting device 2c via the first-C power line Lp1c. The first C sensor 6c may, for example, directly transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and the third lighting device 2c. In Fig. 14, as an example, a signal line through which the first C sensor 6c directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted diagrammatically by a thin dashed line.

[0126] Here, among the multiple lighting devices 2, a lighting device 2 in which the storage unit 5 and the first sensor 6 are not located inside may have a configuration in which the first sensor 6 is deleted from the lighting device 2 illustrated in FIG. 13, as illustrated in FIG. 9, for example.

[0127] Fig. 15 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the second embodiment. Fig. 16 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the second embodiment.

[0128] As shown in FIG. 15 and FIG. 16, the lighting system 1 according to the second embodiment may include, as one or more power storage units 5, one power storage unit 5 capable of supplying power to each of the plurality of lighting devices 2, instead of including a power storage unit 5 located inside each of the plurality of lighting devices 2. In other words, the lighting system 1 may include, as one or more power storage units 5, one power storage unit 5 common to the plurality of lighting devices 2. In this case, the one power storage unit 5 may be electrically connected to the first base power line Lp1o. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. One power storage unit 5 may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first base power line Lp1o and the first C power line Lp1c.

[0129] 15, the lighting system 1 may include, for example, a first sensor 6 built into each of the multiple lighting devices 2, or may include a first sensor 6 located outside the lighting device 2. In FIG. 15, for convenience, the first sensor 6 located inside the lighting device 2 and the first sensor 6 located outside the lighting device 2 are drawn by thin dashed lines for each lighting device 2.

[0130] For example, the lighting system 1 may include a 1A sensor 6a for the first lighting device 2a, which is electrically connected to the 1A power line Lp1a and located outside the first lighting device 2a. This allows the 1A sensor 6a to detect the voltage of the power supplied from the power storage unit 5 to the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. More specifically, the 1A sensor 6a can detect the voltage of the power supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The 1A sensor 6a may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and the first lighting device 2a. In FIG. 15, as an example, a signal line through which the 1A sensor 6a directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0131] For example, the lighting system 1 may include a 1B sensor 6b for the second lighting device 2b that is electrically connected to the 1B power line Lp1b and located outside the second lighting device 2b. This allows the 1B sensor 6b to detect the voltage of the power supplied from the power storage unit 5 to the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. More specifically, the 1B sensor 6b can detect the voltage of the power supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. The 1B sensor 6b may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and the second lighting device 2b. In FIG. 15, as an example, a signal line through which the 1B sensor 6b directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0132] For example, the lighting system 1 may include a 1C sensor 6c for the third lighting device 2c, which is electrically connected to the 1C power line Lp1c and located outside the third lighting device 2c. This allows the 1C sensor 6c to detect the voltage of the power supplied from the power storage unit 5 to the third lighting device 2c via the first base power line Lp1o and the 1C power line Lp1c. More specifically, the 1C sensor 6c can detect the voltage of the power supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 of the third lighting device 2c via the first base power line Lp1o and the 1C power line Lp1c. The 1C sensor 6c may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and the third lighting device 2c. In FIG. 15, as an example, a signal line through which the first C sensor 6c directly transmits a signal related to a voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0133] Here, among the multiple lighting devices 2, the lighting device 2 in which the first sensor 6 is located may have, for example, the configuration illustrated in Fig. 13. Also, among the multiple lighting devices 2, the lighting device 2 in which the first sensor 6 is not located may have, for example, the configuration illustrated in Fig. 9, in which the first sensor 6 is deleted from the lighting device 2 illustrated in Fig. 13.

[0134] Here, for example, a case is assumed in which one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in this one lighting device 2 may transmit a signal related to the voltage detected by the first sensor 6 included in this one lighting device 2 to the second communication unit 42 of the control device 4. In other words, in the above-mentioned control method of the lighting system 1, in the above-mentioned second step, the first communication unit 24 in this one lighting device 2 may transmit a signal related to the voltage detected by the first sensor 6 included in this one lighting device 2 to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in one lighting device 2 detects the voltage of the power supplied from one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of one lighting device 2. If this configuration is adopted, the signal related to the voltage detected by the first sensor 6 in the lighting device 2 is transmitted to the control device 4 by the first communication unit 24 in the lighting device 2, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0135] For example, assume that the first lighting device 2a as one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in the first lighting device 2a may transmit a signal related to the voltage detected by the first sensor 6 included in the first lighting device 2a to the second communication unit 42 of the control device 4. In other words, in the above-mentioned control method for the lighting system 1, in the above-mentioned second step, the first communication unit 24 in the first lighting device 2a may transmit a signal related to the voltage detected by the first sensor 6 included in the first lighting device 2a to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in the first lighting device 2a detects the voltage of the power supplied by one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of the first lighting device 2a. As a result, by transmitting a signal related to the voltage detected by the first sensor 6 in the first lighting device 2a to the control device 4 by the first communication unit 24 in the first lighting device 2a, the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0136] For example, assume that the second lighting device 2b as one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in the second lighting device 2b may transmit a signal related to the voltage detected by the first sensor 6 included in the second lighting device 2b to the second communication unit 42 of the control device 4. In other words, in the above-mentioned control method for the lighting system 1, in the above-mentioned second step, the first communication unit 24 in the second lighting device 2b may transmit a signal related to the voltage detected by the first sensor 6 included in the second lighting device 2b to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in the second lighting device 2b detects the voltage of the power supplied by one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of the second lighting device 2b. As a result, the signal related to the voltage detected by the first sensor 6 in the second lighting device 2b is transmitted to the control device 4 by the first communication unit 24 in the second lighting device 2b, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0137] For example, assume that the third lighting device 2c as one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in the third lighting device 2c may transmit a signal related to the voltage detected by the first sensor 6 included in the third lighting device 2c to the second communication unit 42 of the control device 4. In other words, in the above-mentioned control method for the lighting system 1, in the above-mentioned second step, the first communication unit 24 in the third lighting device 2c may transmit a signal related to the voltage detected by the first sensor 6 included in the third lighting device 2c to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in the third lighting device 2c detects the voltage of the power supplied by one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of the third lighting device 2c. As a result, the signal related to the voltage detected by the first sensor 6 in the third lighting device 2c is transmitted to the control device 4 by the first communication unit 24 in the third lighting device 2c, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0138] Also, here, the lighting system 1 may include a first sensor 6 electrically connected to the first base power line Lp1o as shown in FIG. 16. In this case, the first sensor 6 may be electrically connected to a portion of the first base power line Lp1o that is closer to each lighting device 2 than the portion to which the power storage unit 5 is electrically connected. This allows the first sensor 6 to detect the voltage of the power that the power storage unit 5 supplies to each lighting device 2 via the first power line Lp1. More specifically, the first sensor 6 can detect the voltage of the power that the power storage unit 5 supplies to the first control unit 23 and the first communication unit 24 of each lighting device 2 via the first power line Lp1. For example, the first sensor 6 may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and any one of the multiple lighting devices 2. In FIG. 16, as an example, a signal line for the first sensor 6 to directly transmit a signal related to the voltage as a measurement result to the control device 4 is depicted by a thin dashed line.

[0139] Here, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by one of the first sensors 6 as one or more sensors dropping to a first predetermined value Vp1 set in advance. In other words, in the above-mentioned control method for the lighting system 1, in the above-mentioned second step, in response to the voltage detected by one of the first sensors 6 as one or more sensors dropping to a first predetermined value Vp1 set in advance, the second control unit 41 may shift from the above-mentioned second step to the above-mentioned first step. The first predetermined value Vp1 may be a value larger than the above-mentioned first threshold value Vt1. In this case, the above-mentioned second condition may be, for example, a condition in which the voltage detected by one of the first sensors 6 as one or more sensors dropping to a first predetermined value Vp1 set in advance. Here, the above-mentioned second condition is not limited to a condition in which the voltage detected by one of the first sensors 6 as one or more sensors dropping to a first predetermined value Vp1 set in advance. The second condition may be, for example, a condition in which a predetermined time has elapsed after the voltage detected by one first sensor 6 as one or more sensors has dropped to a predetermined first predetermined value Vp1.

[0140] <2-2. Third embodiment> In the first embodiment described above, for example, instead of providing the second power line Lp2 for supplying power to the control device 4, power may be supplied from the power supply device 3 to the control device 4 via the first power line Lp1, and one or more power storage units 5 may supply power to the control device 4 via the first power line Lp1. In other words, in the second supply operation in the standby state described above, power may be intermittently supplied by the power supply device 3 to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1.

[0141] In this case, the one or more power storage units 5 may include one power storage unit 5 that supplies power to the control device 4 via the first power line Lp1. The above-mentioned first state may be a state in which power is supplied from the power supply device 3 to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1. The above-mentioned second state may be a state in which power is not supplied from the power supply device 3 to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1. Furthermore, when the power supply device 3 is set to the second state, the one power storage unit 5 may supply power to the second control unit 41 and the second communication unit 42 in addition to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2. Furthermore, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state before the voltage of the power supplied from the one or more power storage units 5 to the second control unit 41 and the second communication unit 42 drops to a preset threshold (also referred to as a second threshold). In other words, in the above-mentioned control method for the lighting system 1, in the second step, the one or more power storage units 5 may supply power to the second control unit 41 and the second communication unit 42 in addition to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2. Furthermore, in the above-mentioned control method for the lighting system 1, in the second step, the second control unit 41 may transition from the second step to the first step before the voltage of the power supplied from the one or more power storage units 5 to the second control unit 41 and the second communication unit 42 drops to a preset second threshold. Here, the second threshold value may be, for example, a second operating voltage required for the operation of the second control unit 41 and the second communication unit 42. The second operating voltage may be, for example, the same as the first operating voltage.

[0142] If this configuration is adopted, the second control unit 41 and the second communication unit 42 of the control device 4 are maintained in operation during standby, and standby power consumption in the control device 4 can be reduced. Therefore, in the lighting system 1, power consumption can be further reduced and responsiveness in control of lighting of the lighting devices 2 can be improved. In addition, the power supply device 3 that supplies power to the multiple lighting devices 2 is also used to supply power to the control device 4, so that the configuration for supplying power to the control device 4 can be reduced. This allows the lighting system 1 to conserve resources and reduce manufacturing costs by reducing the configuration.

[0143] Fig. 17 is a block diagram showing an example of an electrical configuration of a lighting system 1 according to a third embodiment. The lighting system 1 shown in Fig. 17 is based on the lighting system 1 shown in Fig. 1, but has a configuration in which a power supply device 3 is connected to a control device 4 in addition to each of a plurality of lighting devices 2 via a first power line Lp1, a power storage unit 5 built into the control device 4 is added, and the second power line Lp2 is deleted.

[0144] Here, for example, when the power storage unit 5 built in each lighting device 2 is to be distinguished from the power storage unit 5 built in the control device 4, the power storage unit 5 built in the control device 4 may be referred to as the second power storage unit 5d. In other words, the one or more power storage units 5 include the 1A power storage unit 5a, the 1B power storage unit 5b, the 1C power storage unit 5c, and the second power storage unit 5d. Here, when the first base power line Lp1o before branching of the first power line Lp1 is to be distinguished from the part connected to the control device 4 after branching, the part connected to the control device 4 of the first power line Lp1 may be referred to as the 1D power line Lp1d. In other words, the first power line Lp1 includes the first base power line Lp1o, the 1A power line Lp1a, the 1B power line Lp1b, the 1C power line Lp1c, and the 1D power line Lp1d. Here, for example, in the case where the first power line Lp1 does not branch and the wiring branches within the power supply device 3, the power supply device 3 and the control device 4 may be electrically connected by a first D power line Lp1d.

[0145] Fig. 18 is a block diagram showing an outline of an example of an electrical configuration of a control device 4 applied to a lighting system 1 according to the third embodiment. The control device 4 shown in Fig. 18 is based on the control device 4 shown in Fig. 4, and has a configuration in which a first power line Lp1 is electrically connected to a power receiving unit 44 instead of the second power line Lp2, and a second power storage unit 5d is added as one power storage unit 5 electrically connected to the power receiving unit 44.

[0146] The power receiving unit 44 can receive power from the power supply device 3 via the first power line Lp1. The power receiving unit 44 is electrically connected to the second control unit 41 and the second communication unit 42. Therefore, the power receiving unit 44 can supply power to each of the second control unit 41 and the second communication unit 42. The second power storage unit 5d as one power storage unit 5 is electrically connected to the first D power line Lp1d of the first power line Lp1. In the example of FIG. 18, the second power storage unit 5d is electrically connected to the power receiving unit 44. In this structure, the second power storage unit 5d can receive power from the power supply device 3 via the first power line Lp1 and the power receiving unit 44 and store the power. More specifically, the second power storage unit 5d can receive DC power from the power supply device 3 via the first power line Lp1 and the power receiving unit 44 and store the DC power. When there is no supply of power from the power supply device 3 via the first power line Lp1, the second power storage unit 5d can supply the power stored in the second power storage unit 5d to the second control unit 41 and the second communication unit 42. More specifically, when there is no supply of power from the power supply device 3 via the first power line Lp1, the second power storage unit 5d can supply the DC power stored in the second power storage unit 5d to the second control unit 41 and the second communication unit 42.

[0147] Fig. 19 is a timing diagram showing an example of the second power supply operation in the lighting system 1 according to the third embodiment. The timing diagram shown in Fig. 19 is based on the timing diagram shown in Fig. 5, and adds a solid line at the bottom, [vi], indicating the change over time in the voltage of the power (also referred to as the fourth voltage) supplied to the second control unit 41 and the second communication unit 42 of the control device 4.

[0148] As shown in FIG. 19, regarding the presence or absence of power output from the power supply device 3 to the first power line Lp1, the power supply device 3 is set to a power output state in a first period P1 in which the power supply control signal is maintained as an on signal, and the power supply device 3 is set to a power non-output state in a second period P2 in which the power supply control signal is maintained as an off signal. As a result, the power supply device 3 is alternately set to a first state in which the power supply device 3 supplies power to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1, and a second state in which the power supply device 3 does not supply power to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1. In other words, the second control unit 41 of the control device 4 alternately sets the power supply device 3 to the first state and the second state during a standby state in which the light sources 21 do not emit the illumination light L1 in all of the multiple lighting devices 2. In the example of FIG. 19, the power supply device 3 is set to the first state in the first period P1, and the power supply device 3 is set to the second state in the second period P2. This allows the power supply device 3 to intermittently supply power to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1.

[0149] As shown in Fig. 19, in the first period P1, the power supply device 3 supplies power to each of the lighting devices 2 and the control device 4 via the first power line Lp1. Therefore, the voltage of the power supplied to the second control unit 41 and the second communication unit 42 of the control device and the first control unit 23 and the first communication unit 24 of each lighting device 2 becomes a voltage Vh1 corresponding to the first output voltage of the power supply device 3. More specifically, in the first period P1, the first voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, the second voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, the third voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the third lighting device 2c, and the fourth voltage of the power supplied to the second control unit 41 and the second communication unit 42 of the control device 4 each become a voltage Vh1 corresponding to the first output voltage of the power supply device 3.

[0150] Meanwhile, for example, when the power supply device 3 is set to the first state, the power supply device 3 also supplies power to each power storage unit 5 via the first power line Lp1. Therefore, when the power supply device 3 is set to the first state, each of the four power storage units 5 as the one or more power storage units 5 stores power in response to the supply of power from the power supply device 3 via the first power line Lp1. In the example of FIG. 19, when the power supply device 3 is set to the first state in the first period P1, the firstA power storage unit 5a of the first lighting device 2a stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, the firstB power storage unit 5b of the second lighting device 2b stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, the firstC power storage unit 5c of the third lighting device 2c stores power in response to the supply of power from the power supply device 3 via the first power line Lp1, and the second power storage unit 5d of the control device 4 stores power in response to the supply of power from the power supply device 3 via the first power line Lp1.

[0151] Also, for example, when the power supply device 3 is set to the second state, the power supply device 3 does not supply power to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1, and does not supply power to each power storage unit 5 via the first power line Lp1. Therefore, each power storage unit 5 may release the stored power. Here, when the power supply device 3 is set to the second state, the four power storage units 5 as the one or more power storage units 5 supply power to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2 and the second control unit 41 and the second communication unit 42 in the control device 4.

[0152] In the example of FIG. 19, when the power supply device 3 is set to the second state in the second period P2, the 1A power storage unit 5a of the first lighting device 2a supplies power to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, the 1B power storage unit 5b of the second lighting device 2b supplies power to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, the 1C power storage unit 5c of the third lighting device 2c supplies power to the first control unit 23 and the first communication unit 24 of the third lighting device 2c, and the second power storage unit 5d of the control device 4 supplies power to the second control unit 41 and the second communication unit 42 of the control device 4.

[0153] Here, for example, the four power storage units 5 as one or more power storage units 5 release the stored power, and the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 each consume power. As a result, the voltage of the power supplied by the four power storage units 5 as one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 gradually decreases. For example, as shown in FIG. 19, in the second period P2, the first voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the first lighting device 2a, the second voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the second lighting device 2b, the third voltage of the power supplied to the first control unit 23 and the first communication unit 24 of the third lighting device 2c, and the fourth voltage of the power supplied to the second control unit 41 and the second communication unit 42 of the control device 4 each gradually decrease from a voltage Vh1 corresponding to the first output voltage of the power supply device 3.

[0154] Also, for example, when the power supply device 3 is set to the second state, the power supply device 3 is set to the first state from the second state before the fourth voltage of the power supplied from the second power storage unit 5d as one power storage unit 5 included in the one or more power storage units 5 to the second control unit 41 and the second communication unit 42 of the control device 4 drops to the second threshold value Vt2. In other words, when the power supply device 3 is set to the second state, the second control unit 41 of the control device 4 sets the power supply device 3 from the second state to the first state before the fourth voltage of the power supplied from the second power storage unit 5d as one power storage unit 5 included in the one or more power storage units 5 to the second control unit 41 and the second communication unit 42 of the control device 4 drops to the second threshold value Vt2.

[0155] 19, when the power supply device 3 is set to the second state in the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the first voltage of the power supplied from the 1A power storage unit 5a of the first lighting device 2a to the first control unit 23 and the first communication unit 24 of the first lighting device 2a drops to the preset first threshold value Vt1. When the power supply device 3 is set to the second state in the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the second voltage of the power supplied from the 1B power storage unit 5b of the second lighting device 2b to the first control unit 23 and the first communication unit 24 of the second lighting device 2b drops to the preset first threshold value Vt1. When the power supply device 3 is set to the second state in the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the third voltage of the power supplied from the first C power storage unit 5c of the third lighting device 2c to the first control unit 23 and the first communication unit 24 of the third lighting device 2c drops to a preset first threshold value Vt1. When the power supply device 3 is set to the second state in the second period P2, the second control unit 41 sets the power supply device 3 from the second state to the first state before the fourth voltage of the power supplied from the second power storage unit 5d of the control device 4 to the second control unit 41 and the second communication unit 42 of the control device 4 drops to a preset second threshold value Vt2.

[0156] This allows the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 to be maintained in operation in the standby state. Thus, each lighting device 2 can quickly receive control signals such as a lighting control signal and a dimming control signal from the control device 4 by the first communication unit 24, and can quickly control the lighting of the light source 21 in response to the control signals such as the lighting control signal and the dimming control signal by the first control unit 23.

[0157] Here, the first predetermined time of the first period P1 may be set to, for example, a time required for sufficient storage of the four power storage units 5 as the one or more power storage units 5. The second predetermined time of the second period P2 may be set to, for example, a time during which the fourth voltage of the power supplied from the second power storage unit 5d included in the one or more power storage units 5 to the second control unit 41 and the second communication unit 42 of the control device 4 does not fall to the second threshold value Vt2. Also, the second predetermined time of the second period P2 may be set to, for example, a time during which the fourth voltage does not fall to the second threshold value Vt2 and the voltage of the power supplied from the 1A power storage unit 5a, the 1B power storage unit 5b, and the 1C power storage unit 5c included in the one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of each of the multiple lighting devices 2 does not fall to the first threshold value Vt1. For example, if each of the first threshold Vt1 and the second threshold Vt2 is 3.3 V, the second predetermined time of the second period P2 may be set to the time it takes for each of the first voltage, the second voltage, the third voltage, and the fourth voltage to drop from 4 V to a predetermined voltage of about 6 V. The second predetermined time of the second period P2 may be set based on, for example, design information of the lighting system 1, or may be set based on experimental results using the lighting system 1.

[0158] Here, in the lighting system 1, for example, when the light sources 21 of one or more lighting devices 2 are in a turned-on state, the first supply operation is executed, and the power supply device 3 continues to supply power to the control device 4 and each of the multiple lighting devices 2 via the first power line Lp1. As a result, the voltage of the power supplied to each of the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 can be constant at voltage Vh1 corresponding to the first output voltage of the power supply device 3.

[0159] In contrast, in the lighting system 1, for example, when in a standby state, as described above, the second supply operation is performed to cause the power supply device 3 to intermittently supply power to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1. As a result, during multiple second periods P2 in which the power supply device 3 does not supply power to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1, the voltage of the power supplied to each of the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 may be lower than the voltage Vh1 corresponding to the first output voltage of the power supply device 3. As a result, the power consumption in the multiple lighting devices 2 and the control device 4 may be reduced.

[0160] Thus, during standby, the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 are maintained in operation, and standby power consumption in each of the lighting devices 2 and the control device 4 can be reduced. Thus, in the lighting system 1, power consumption can be further reduced and responsiveness in control of lighting of the lighting devices 2 can be improved.

[0161] Here, for example, each of the multiple lighting devices 2 and the control device 4 may or may not include a power storage unit 5. One or more power storage units 5 for supplying power to each of the multiple lighting devices 2 and the control device 4 may be electrically connected to a first power line Lp1 that electrically connects the power supply device 3 to the multiple lighting devices 2 and the control device 4.

[0162] Fig. 20 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the third embodiment. Fig. 21 is a block diagram illustrating another example of the electrical configuration of the control device 4 applied to the lighting system 1 according to the third embodiment.

[0163] As shown in FIG. 20, the lighting system 1 according to the third embodiment may include, for example, a second power storage unit 5d located inside the control device 4, or may include a second power storage unit 5d located outside the control device 4. In FIG. 20, for convenience, the second power storage unit 5d located inside the control device 4 and the second power storage unit 5d located outside the control device 4 are drawn with thin dashed lines. Also, as shown in FIG. 20, the lighting system 1 according to the third embodiment may include, for example, a power storage unit 5 located inside the lighting device 2 for each of the multiple lighting devices 2, or may include a power storage unit 5 located outside the lighting device 2. In FIG. 20, for convenience, the power storage unit 5 located inside the lighting device 2 and the power storage unit 5 located outside the lighting device 2 for each lighting device 2 are drawn with thin dashed lines.

[0164] For example, the lighting system 1 may include, for the control device 4, a second power storage unit 5d as one power storage unit 5 electrically connected to a first D power line Lp1d as a portion of the first power line Lp1 connected to the control device 4 and located outside the control device 4. In this case, the second power storage unit 5d may be electrically connected to the power receiving unit 44 of the control device 4 via the first D power line Lp1d.

[0165] For example, the lighting system 1 may include a first-A power storage unit 5a for the first lighting device 2a that is electrically connected to the first-A power line Lp1a and located outside the first lighting device 2a. In this case, the first-A power storage unit 5a may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the first-A power line Lp1a.

[0166] For example, the lighting system 1 may include a 1B power storage unit 5b electrically connected to the 1B power line Lp1b and located outside the second lighting device 2b for the second lighting device 2b. In this case, the 1B power storage unit 5b may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the 1B power line Lp1b.

[0167] For example, the lighting system 1 may include a first-cell power storage unit 5c for the third lighting device 2c that is electrically connected to the first-cell power line Lp1c and located outside the third lighting device 2c. In this case, the first-cell power storage unit 5c may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first-cell power line Lp1c.

[0168] Here, among the multiple lighting devices 2, the lighting device 2 in which the power storage unit 5 is located may have, for example, the configuration illustrated in FIG. 3. Moreover, among the multiple lighting devices 2, the lighting device 2 in which the power storage unit 5 is not located may have, for example, the configuration illustrated in FIG. 9. Moreover, the control device 4 in which the second power storage unit 5d is located may have, for example, the configuration illustrated in FIG. 18. The control device 4 in which the second power storage unit 5d is not located may have, for example, a configuration in which the second power storage unit 5d is deleted from the control device 4 illustrated in FIG. 18, as shown in FIG. 21.

[0169] FIG. 22 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the third embodiment.

[0170] As shown in FIG. 22, the lighting system 1 according to the third embodiment may include, as one or more power storage units 5, one power storage unit 5 capable of supplying power to each of the multiple lighting devices 2 and the control device 4, instead of including the power storage units 5 located inside each of the multiple lighting devices 2 and the control device 4. In other words, the lighting system 1 according to the third embodiment may include, as one or more power storage units 5, one power storage unit 5 common to the multiple lighting devices 2 and the control device 4. In this case, the one power storage unit 5 may be electrically connected to the first base power line Lp1o. Then, the one power storage unit 5 may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. One power storage unit 5 may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first base power line Lp1o and the firstC power line Lp1c. One power storage unit 5 may be electrically connected to the power receiving unit 44 of the control device 4 via the first base power line Lp1o and the firstD power line Lp1d. Here, for example, each lighting device 2 may have the configuration exemplified in FIG. 9. Also, for example, the control device 4 may have the configuration exemplified in FIG. 21.

[0171] <2-3. Fourth embodiment> In the third embodiment, for example, the lighting system 1 may include a sensor that detects the voltage of the power supplied from one or more power storage units 5 to the second control unit 41 and the second communication unit 42 in the control device 4. Then, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the sensor. In other words, in the above-mentioned control method for the lighting system 1, in the second step, the second control unit 41 may transition from the second step to the first step in response to the voltage detected by the sensor. For example, various voltage sensors may be applied to the sensor.

[0172] If this configuration is adopted, the second control unit 41 and the second communication unit 42 of the control device 4 can be more stably maintained in operation during standby, while the standby power consumption of the control device 4 can be reduced. Therefore, in the lighting system 1, the reduction in power consumption and the improvement in responsiveness in the control related to the lighting of the lighting device 2 can be more stably achieved.

[0173] FIG. 23 is a block diagram showing an example of an electrical configuration of the control device 4 applied to the lighting system 1 according to the fourth embodiment. The control device 4 shown in FIG. 23 has a configuration in which a second sensor 7 is added based on the control device 4 shown in FIG. 18. Here, the lighting system 1 may include the second sensor 7 as a sensor. The control device 4 may include the second sensor 7. Then, as shown in FIG. 23, for example, if the control device 4 includes the second sensor 7, the second sensor 7 in the control device 4 can detect the voltage of the power supplied from the second power storage unit 5d as one power storage unit 5 included in one or more power storage units 5 to the second control unit 41 and the second communication unit 42. For example, various voltage sensors are applied to the second sensor 7. In this case, for example, the second sensor 7 may be electrically connected to the power receiving unit 44 and measure the voltage supplied from the power storage unit 5 to the second control unit 41 and the second communication unit 42 via the power receiving unit 44. Here, the second sensor 7 may be electrically connected to, for example, the second control unit 41. The second sensor 7 may transmit a signal related to the voltage as a measurement result to the second control unit 41. Here, since the second sensor 7 is located inside the control device 4, the addition of a configuration for transmitting information from the second sensor 7 to the control device 4 can be reduced.

[0174] Fig. 24 is a timing diagram showing an example of the second power supply operation in the lighting system 1 according to the fourth embodiment. The timing diagram in Fig. 24 is based on the timing diagram shown in Fig. 19, and adds a straight thin dashed dotted line indicating the second predetermined value Vp2 for the fourth voltage.

[0175] Here, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the second sensor 7 as a sensor dropping to a preset value (also referred to as a second preset value) Vp2. In other words, in the above-mentioned method of controlling the lighting system 1, in response to the voltage detected by the second sensor 7 as a sensor dropping to the preset second preset value Vp2 in the above-mentioned second step, the second control unit 41 may transition from the above-mentioned second step to the above-mentioned first step. The second preset value Vp2 may be a value larger than the above-mentioned second threshold value Vt2.

[0176] In this case, the second condition described above may be, for example, a condition that the voltage detected by the second sensor 7 as a sensor has fallen to a preset second predetermined value Vp2. The second predetermined value Vp2 may be a value smaller than the voltage Vh1 corresponding to the first output voltage of the power supply device 3. For example, if the second threshold value Vt2 is 3.3V and the voltage Vh1 is 12V, a voltage value of about 4V to 6V may be applied to the second predetermined value Vp2. Here, the second condition described above is not limited to a condition that the voltage detected by the second sensor 7 has fallen to a preset second predetermined value Vp2. The second condition described above may be, for example, a condition that a preset predetermined time has elapsed after the voltage detected by the second sensor 7 has fallen to the preset second predetermined value Vp2.

[0177] If this configuration is adopted, the second control unit 41 and the second communication unit 42 of the control device 4 can be more stably maintained in operation during standby, while the standby power consumption of the control device 4 can be reduced. Therefore, in the lighting system 1, the reduction in power consumption and the improvement in responsiveness in the control related to the lighting of the lighting device 2 can be more stably achieved.

[0178] 23, the control device 4 includes the power storage unit 5, but is not limited to this. The power storage unit 5 for supplying power to the second control unit 41 and the second communication unit 42 of the control device 4 may be electrically connected to the first power line Lp1 that electrically connects the power supply device 3 and the control device 4.

[0179] FIG. 25 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the fourth embodiment.

[0180] As shown in FIG. 25, the lighting system 1 according to the fourth embodiment may include, for example, a second power storage unit 5d located inside the control device 4, or may include a second power storage unit 5d located outside the control device 4. In FIG. 25, for convenience, the second power storage unit 5d located inside the control device 4 and the second power storage unit 5d located outside the control device 4 are drawn with thin dashed lines. Also, as shown in FIG. 25, the lighting system 1 according to the fourth embodiment may include, for example, a power storage unit 5 located inside the lighting device 2 for each of the multiple lighting devices 2, or may include a power storage unit 5 located outside the lighting device 2. In FIG. 25, for convenience, the power storage unit 5 located inside the lighting device 2 and the power storage unit 5 located outside the lighting device 2 for each lighting device 2 are drawn with thin dashed lines.

[0181] Fig. 26 is a block diagram illustrating roughly another example of the electrical configuration of the control device 4 applied to the lighting system 1 according to the fourth embodiment. Here, for example, the control device 4 having the second power storage unit 5d located therein may have the configuration of the control device 4 illustrated in Fig. 23. For example, the control device 4 not having the second power storage unit 5d located therein may have a configuration obtained by deleting the second power storage unit 5d from the control device 4 illustrated in Fig. 23, as illustrated in Fig. 26.

[0182] In the above description, the control device 4 includes the second sensor 7, but this is not limited to the above. Fig. 27 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the fourth embodiment. The lighting system 1 illustrated in Fig. 27 has a configuration in which the second power storage unit 5d and the second sensor 7 located inside the control device 4 are changed to the second power storage unit 5d and the second sensor 7 located outside the control device 4, based on the lighting system 1 illustrated in Fig. 25.

[0183] For example, as shown in FIG. 27, the lighting system 1 according to the fourth embodiment may include a second sensor 7 located outside the control device 4 instead of the second storage unit 5d located inside the control device 4, provided that the lighting system 1 includes a second storage unit 5d located outside the control device 4 instead of the second sensor 7 located inside the control device 4. In this case, the lighting system 1 may include the second storage unit 5d and the second sensor 7 that are electrically connected to the first D power line Lp1d and located outside the control device 4. Here, the second sensor 7 may be electrically connected to a portion of the first D power line Lp1d that is closer to the control device 4 than a portion to which the second storage unit 5d is electrically connected. This allows the second sensor 7 to detect the voltage of the power that the second storage unit 5d supplies to the control device 4 via the first D power line Lp1d. More specifically, the second sensor 7 can detect the voltage of the power supplied from the second power storage unit 5d to the second control unit 41 and the second communication unit 42 of the control device 4 via the first D power line Lp1d. Here, the second sensor 7 may transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line. In FIG. 27, as an example, a signal line through which the second sensor 7 transmits a signal related to the voltage as a measurement result to the control device 4 is depicted by a thin dashed line. Here, the control device 4 in which the second power storage unit 5d and the second sensor 7 are not located inside may have a configuration in which the second sensor 7 is deleted from the control device 4 illustrated in FIG. 26, as illustrated in FIG. 21, for example.

[0184] FIG. 28 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the fourth embodiment.

[0185] As shown in FIG. 28, the lighting system 1 according to the fourth embodiment may include, as one or more power storage units 5, one power storage unit 5 capable of supplying power to each of the multiple lighting devices 2 and the control device 4, instead of including the power storage units 5 located inside each of the multiple lighting devices 2 and the control device 4. In other words, the lighting system 1 according to the fourth embodiment may include, as one or more power storage units 5, one power storage unit 5 common to the multiple lighting devices 2 and the control device 4. In this case, the one power storage unit 5 may be electrically connected to the first base power line Lp1o. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. One power storage unit 5 may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first base power line Lp1o and the firstC power line Lp1c. One power storage unit 5 may be electrically connected to the power receiving unit 44 of the control device 4 via the first base power line Lp1o and the firstD power line Lp1d.

[0186] Here, as shown in FIG. 28, the lighting system 1 may include, for example, a second sensor 7 built into the control device 4, or may include a second sensor 7 located outside the control device 4. In FIG. 28, the second sensor 7 located inside the control device 4 and the second sensor 7 located outside the control device 4 are depicted by thin dashed lines. For example, when the lighting system 1 includes the second sensor 7 built into the control device 4, the control device 4 may have, for example, the configuration illustrated in FIG. 26. Also, for example, when the lighting system 1 includes the second sensor 7 located outside the control device 4, the second sensor 7 may be electrically connected to the first D power line Lp1d. In this case, the second sensor 7 can detect the voltage of the power that the power storage unit 5 supplies to the control device 4 via the first D power line Lp1d. More specifically, the second sensor 7 can detect the voltage of the power that the power storage unit 5 supplies to the second control unit 41 and the second communication unit 42 of the control device 4 via the first D power line Lp1d. The second sensor 7 may transmit, for example, a signal related to the voltage as a measurement result to the control device 4 via a signal line. In Fig. 28, as an example, a signal line through which the second sensor 7 transmits a signal related to the voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0187] <2-4. Fifth embodiment> In the third embodiment, for example, the lighting system 1 may include one or more first sensors 6 and a second sensor 7. The one or more first sensors 6 detect the voltage of the power that the one or more power storage units 5 supply to the first control unit 23 and the first communication unit 24 in each of the multiple lighting devices 2. The second sensor 7 detects the voltage of the power that the one or more power storage units 5 supply to the second control unit 41 and the second communication unit 42 of the control device 4. Then, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the one or more first sensors 6 and the voltage detected by the second sensor 7. In other words, in the above-mentioned method of controlling the lighting system 1, in the second step, the second control unit 41 may transition from the second step to the first step in response to the voltage detected by the one or more first sensors 6 and the voltage detected by the second sensor 7.

[0188] If this configuration is adopted, the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 can be more stably maintained in operation during standby, while the standby power consumption of the multiple lighting devices 2 can be reduced. Therefore, in the lighting system 1, reduction in power consumption and improvement in responsiveness in control of lighting of the lighting devices 2 can be more stably achieved.

[0189] Here, for example, the lighting system 1 may include a plurality of first sensors 6 as the one or more first sensors 6. Then, for example, as shown in Fig. 11, each of the plurality of lighting devices 2 may include one first sensor 6 among the plurality of first sensors 6. In this way, if each of the plurality of lighting devices 2 includes one first sensor 6, in each of the plurality of lighting devices 2, the one first sensor 6 can detect the voltage of the power supplied from one or more power storage units 5 to the first control unit 23 and the first communication unit 24.

[0190] Here, in each lighting device 2, the first sensor 6 may be electrically connected to, for example, the first control unit 23. Then, the first sensor 6 may transmit a signal related to the voltage as a measurement result to the first control unit 23. The first control unit 23 may transmit a signal related to the voltage measured by the first sensor 6 to the control device 4 via the first communication unit 24. In other words, for example, in each of the multiple lighting devices 2, the first communication unit 24 may transmit a signal related to the voltage detected by one first sensor 6 to the second communication unit 42. In other words, in the above-mentioned control method for the lighting system 1, in each of the multiple lighting devices 2, in the above-mentioned second step, the first communication unit 24 may transmit a signal related to the voltage supplied by one or more power storage units 5 detected by one first sensor 6 to the first control unit 23 and the first communication unit 24 to the second communication unit 42. According to this configuration, in each lighting device 2, a signal related to the voltage detected by the first sensor 6 in the lighting device 2 is transmitted to the control device 4 by the first communication unit 24 in the lighting device 2, thereby reducing the need to add a component for transmitting signals related to the voltage.

[0191] Also, here, for example, as shown in FIG. 23, the control device 4 may include the second power storage unit 5d and the second sensor 7. In this way, if the control device 4 includes the second sensor 7, the second sensor 7 in the control device 4 can detect the voltage of the power supplied from the second power storage unit 5d as one power storage unit 5 included in one or more power storage units 5 to the second control unit 41 and the second communication unit 42. Here, the second sensor 7 may be electrically connected to the second control unit 41, for example. Then, the second sensor 7 may transmit a signal related to the voltage as a measurement result to the second control unit 41. Here, since the second sensor 7 is located in the control device 4, the addition of a configuration for transmitting information from the second sensor 7 to the control device 4 can be reduced.

[0192] Fig. 29 is a timing diagram showing an example of the second power supply operation in the lighting system 1 according to the fourth embodiment. The timing diagram in Fig. 29 is based on the timing diagram shown in Fig. 19, and adds straight thin dashed dotted lines indicating a first predetermined value Vp1 for each of the first voltage, the second voltage, and the third voltage, and adds a straight thin dashed dotted line indicating a second predetermined value Vp2 for the fourth voltage.

[0193] Here, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the first sensors 6 as the one or more first sensors 6 dropping to a first predetermined value Vp1 set in advance, or the voltage detected by the second sensor 7 dropping to a second predetermined value Vp2 set in advance. In other words, in the above-mentioned method of controlling the lighting system 1, in the above-mentioned second step, the second control unit 41 may transition from the above-mentioned second step to the above-mentioned first step in response to the voltage detected by the first sensors 6 as the one or more first sensors 6 dropping to a first predetermined value Vp1 set in advance, or the voltage detected by the second sensor 7 dropping to a second predetermined value Vp2 set in advance. The first predetermined value Vp1 may be a value larger than the above-mentioned first threshold value Vt1. The second predetermined value Vp2 may be a value larger than the above-mentioned second threshold value Vt2. Here, for example, the first threshold value Vt1 and the second threshold value Vt2 may be the same, and the first predetermined value Vp1 and the second predetermined value Vp2 may be the same.

[0194] In this case, the second condition described above may be, for example, a condition in which the voltage detected by the first sensors 6 serving as one or more first sensors 6 drops to a preset first predetermined value Vp1, or the voltage detected by the second sensor 7 drops to a preset second predetermined value Vp2. The first predetermined value Vp1 and the second predetermined value Vp2 may each be a value smaller than the voltage Vh1 corresponding to the first output voltage of the power supply device 3. For example, if the first threshold value Vt1 and the second threshold value Vt2 are 3.3 V and the voltage Vh1 is 12 V, a voltage value of about 4 V to 6 V may be applied to the first predetermined value Vp1 and the second predetermined value Vp2.

[0195] If this configuration is adopted, the first control unit 23 and the first communication unit 24 of each lighting device 2 and the second control unit 41 and the second communication unit 42 of the control device 4 can be more stably maintained in operation during standby, while the standby power consumption of the multiple lighting devices 2 can be reduced. Therefore, in the lighting system 1, reduction in power consumption and improvement in responsiveness in control of lighting of the lighting devices 2 can be more stably achieved.

[0196] Here, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the first sensor 6 in one of the multiple lighting devices 2 dropping to a first predetermined value Vp1.

[0197] More specifically, for example, in each of the multiple lighting devices 2, the first control unit 23 may transmit a signal (first signal) indicating that the voltage detected by the first sensor 6 has dropped to a first predetermined value Vp1 as a signal related to the voltage measured by the first sensor 6 to the second communication unit 42 via the first communication unit 24. In this case, for example, when the power supply device 3 is set to the second state, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the first signal from the first control unit 23 of any one of the multiple lighting devices 2.

[0198] Also, for example, in each of the plurality of lighting devices 2, the first control unit 23 may transmit a signal (voltage signal) indicating the voltage detected by the first sensor 6 as a signal related to the voltage measured by the first sensor 6 to the second communication unit 42 via the first communication unit 24. In this case, for example, the second control unit 41 may detect that the voltage measured by the first sensor 6 has dropped to a first predetermined value Vp1 based on a voltage signal from the first control unit 23 of any one of the plurality of lighting devices 2 when the power supply device 3 is set to the second state. Then, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the first sensor 6 of any one of the plurality of lighting devices 2 dropping to a first predetermined value Vp1 set in advance when the power supply device 3 is set to the second state.

[0199] Also, for example, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the second sensor 7 in the control device 4 dropping to the second predetermined value Vp2 when the power supply device 3 is set to the second state. Here, the above-mentioned second condition is not limited to the condition that the voltage detected by the first sensors 6 as the one or more first sensors 6 has dropped to the preset first predetermined value Vp1, or the voltage detected by the second sensor 7 has dropped to the preset second predetermined value Vp2. The above-mentioned second condition may be, for example, a condition that a preset predetermined time has elapsed after the voltage detected by the first sensors 6 as the one or more first sensors 6 has dropped to the preset first predetermined value Vp1, or a condition that a preset predetermined time has elapsed after the voltage detected by the second sensor 7 has dropped to the preset second predetermined value Vp2, or the like.

[0200] In the example of FIG. 11, each lighting device 2 includes the power storage unit 5, but this is not limited thereto. One or more power storage units 5 for supplying power to the first control unit 23 and the first communication unit 24 of each lighting device 2 may be electrically connected to the first power line Lp1 that electrically connects the power supply device 3 and the lighting device 2. Here, as illustrated in FIG. 20, the lighting system 1 according to the fifth embodiment may include, for example, a power storage unit 5 located inside the lighting device 2 for each of the multiple lighting devices 2, or may include a power storage unit 5 located outside the lighting device 2. Here, as illustrated in FIG. 20, the lighting system 1 according to the fifth embodiment may include, for example, a second power storage unit 5d located inside the control device 4, or may include a second power storage unit 5d located outside the control device 4.

[0201] Here, among the multiple lighting devices 2, the lighting device 2 in which the power storage unit 5 is located may have, for example, the configuration illustrated in FIG. 11. Among the multiple lighting devices 2, the lighting device 2 in which the power storage unit 5 is not located may have, for example, the configuration illustrated in FIG. 13. Also, here, the control device 4 in which the second power storage unit 5d is located may have, for example, the configuration illustrated in FIG. 23. The control device 4 in which the second power storage unit 5d is not located may have, for example, the configuration illustrated in FIG. 26.

[0202] In the above description, each lighting device 2 includes the first sensor 6, but this is not limited to the above. For example, the lighting system 1 according to the fifth embodiment may include a first sensor 6 located outside the lighting device 2 instead of the first sensor 6 located inside the lighting device 2, as long as the lighting system 1 includes a power storage unit 5 located outside the lighting device 2 instead of the power storage unit 5 located inside the lighting device 2.

[0203] FIG. 30 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the fifth embodiment.

[0204] As shown in FIG. 30, the lighting system 1 according to the fifth embodiment may, for example, include, for each of a plurality of lighting devices 2, a power storage unit 5 and a first sensor 6 located outside the lighting device 2, instead of a power storage unit 5 and a first sensor 6 located inside the lighting device 2.

[0205] For example, the lighting system 1 may include a first A power storage unit 5a and a first A sensor 6a for the first lighting device 2a, which are electrically connected to the first A power line Lp1a and located outside the first lighting device 2a. In this case, the first A sensor 6a may be electrically connected to a portion of the first A power line Lp1a that is closer to the first lighting device 2a than the portion to which the first A power storage unit 5a is electrically connected. This allows the first A sensor 6a to detect the voltage of the power that the first A power storage unit 5a supplies to the first lighting device 2a via the first A power line Lp1a. More specifically, the first A sensor 6a can detect the voltage of the power that the first A power storage unit 5a supplies to the first control unit 23 and the first communication unit 24 of the first lighting device 2a via the first A power line Lp1a. The 1A sensor 6a may, for example, directly transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and the first lighting device 2a. In Fig. 30, as an example, a signal line through which the 1A sensor 6a directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0206] For example, the lighting system 1 may include a 1B power storage unit 5b and a 1B sensor 6b for the second lighting device 2b, which are electrically connected to the 1B power line Lp1b and located outside the second lighting device 2b. In this case, the 1B sensor 6b may be electrically connected to a portion of the 1B power line Lp1b that is closer to the second lighting device 2b than the portion to which the 1B power storage unit 5b is electrically connected. This allows the 1B sensor 6b to detect the voltage of the power that the 1B power storage unit 5b supplies to the second lighting device 2b via the 1B power line Lp1b. More specifically, the 1B sensor 6b can detect the voltage of the power that the 1B power storage unit 5b supplies to the first control unit 23 and the first communication unit 24 of the second lighting device 2b via the 1B power line Lp1b. The 1B sensor 6b may, for example, directly transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and the second lighting device 2b. In Fig. 30, as an example, a signal line through which the 1B sensor 6b directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted diagrammatically by a thin dashed line.

[0207] For example, the lighting system 1 may include a 1C storage unit 5c and a 1C sensor 6c for the third lighting device 2c, which are electrically connected to the 1C power line Lp1c and located outside the third lighting device 2c. In this case, the 1C sensor 6c may be electrically connected to a portion of the 1C power line Lp1c that is closer to the third lighting device 2c than the portion to which the 1C storage unit 5c is electrically connected. This allows the 1C sensor 6c to detect the voltage of the power that the 1C storage unit 5c supplies to the third lighting device 2c via the 1C power line Lp1c. More specifically, the 1C sensor 6c can detect the voltage of the power that the 1C storage unit 5c supplies to the first control unit 23 and the first communication unit 24 of the third lighting device 2c via the 1C power line Lp1c. The first C sensor 6c may, for example, directly transmit a signal related to the voltage as a measurement result to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and the third lighting device 2c. In Fig. 30, as an example, a signal line through which the first C sensor 6c directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted diagrammatically by a thin dashed line.

[0208] Here, among the plurality of lighting devices 2, a lighting device 2 in which the power storage unit 5 and the first sensor 6 are not located may have the configuration exemplified in FIG. 9, for example.

[0209] Also, as shown in FIG. 30, the lighting system 1 according to the fifth embodiment may include a second sensor 7 located outside the control device 4 instead of the second sensor 7 located inside the control device 4, as long as the lighting system 1 includes a second power storage unit 5d located outside the control device 4 instead of the second power storage unit 5d located inside the control device 4. In this case, the lighting system 1 may include the second power storage unit 5d and the second sensor 7 that are electrically connected to the first D power line Lp1d and located outside the control device 4. Here, the second sensor 7 may be electrically connected to a portion of the first D power line Lp1d that is closer to the control device 4 than a portion to which the second power storage unit 5d is electrically connected. This allows the second sensor 7 to detect the voltage of the power that the second power storage unit 5d supplies to the control device 4 via the first D power line Lp1d. More specifically, the second sensor 7 can detect the voltage of the power supplied from the second power storage unit 5d to the second control unit 41 and the second communication unit 42 of the control device 4 via the first D power line Lp1d. Here, the second sensor 7 may transmit a signal related to the voltage as the measurement result to the control device 4 via a signal line. In FIG. 30, as an example, the signal line through which the second sensor 7 transmits the signal related to the voltage as the measurement result to the control device 4 is diagrammatically depicted by a thin dashed line.

[0210] Here, the control device 4 in which the second power storage unit 5d and the second sensor 7 are not located may have the configuration illustrated in FIG. 21, for example.

[0211] Fig. 31 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the fifth embodiment. Fig. 32 is a block diagram illustrating another example of the electrical configuration of the lighting system 1 according to the fifth embodiment.

[0212] As shown in FIG. 31 and FIG. 32, the lighting system 1 according to the fifth embodiment may include, as one or more power storage units 5, one power storage unit 5 capable of supplying power to each of the plurality of lighting devices 2 and the control device 4, instead of including the power storage units 5 located inside each of the plurality of lighting devices 2 and the control device 4. In other words, the lighting system 1 may include, as one or more power storage units 5, one power storage unit 5 common to the plurality of lighting devices 2 and the control device 4. In this case, the one power storage unit 5 may be electrically connected to the first base power line Lp1o. Then, the one power storage unit 5 may be electrically connected to the power receiving unit 25 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The one power storage unit 5 may be electrically connected to the power receiving unit 25 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. One power storage unit 5 may be electrically connected to the power receiving unit 25 of the third lighting device 2c via the first base power line Lp1o and the firstC power line Lp1c. One power storage unit 5 may be electrically connected to the power receiving unit 44 of the control device 4 via the first base power line Lp1o and the firstD power line Lp1d.

[0213] 31, the lighting system 1 may include, for example, a first sensor 6 built into each of the multiple lighting devices 2, or may include a first sensor 6 located outside the lighting device 2. In FIG. 31, for convenience, the first sensor 6 located inside the lighting device 2 and the first sensor 6 located outside the lighting device 2 are drawn by thin dashed lines for each lighting device 2.

[0214] For example, the lighting system 1 may include a 1A sensor 6a for the first lighting device 2a, which is electrically connected to the 1A power line Lp1a and located outside the first lighting device 2a. This allows the 1A sensor 6a to detect the voltage of the power supplied from the power storage unit 5 to the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. More specifically, the 1A sensor 6a can detect the voltage of the power supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 of the first lighting device 2a via the first base power line Lp1o and the 1A power line Lp1a. The 1A sensor 6a may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and the first lighting device 2a. In FIG. 31, as an example, a signal line through which the 1A sensor 6a directly transmits a signal related to the voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0215] For example, the lighting system 1 may include a 1B sensor 6b for the second lighting device 2b that is electrically connected to the 1B power line Lp1b and located outside the second lighting device 2b. This allows the 1B sensor 6b to detect the voltage of the power supplied from the power storage unit 5 to the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. More specifically, the 1B sensor 6b can detect the voltage of the power supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 of the second lighting device 2b via the first base power line Lp1o and the 1B power line Lp1b. The 1B sensor 6b may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and the second lighting device 2b. In FIG. 31, as an example, a signal line through which the 1B sensor 6b directly transmits a signal related to a voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0216] For example, the lighting system 1 may include a 1C sensor 6c for the third lighting device 2c, which is electrically connected to the 1C power line Lp1c and located outside the third lighting device 2c. This allows the 1C sensor 6c to detect the voltage of the power supplied from the power storage unit 5 to the third lighting device 2c via the first base power line Lp1o and the 1C power line Lp1c. More specifically, the 1C sensor 6c can detect the voltage of the power supplied from the power storage unit 5 to the first control unit 23 and the first communication unit 24 of the third lighting device 2c via the first base power line Lp1o and the 1C power line Lp1c. The 1C sensor 6c may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal to the control device 4 via the signal line and the third lighting device 2c. In FIG. 31, as an example, a signal line through which the first C sensor 6c directly transmits a signal related to a voltage as a measurement result to the control device 4 is depicted typically by a thin dashed line.

[0217] Here, among the multiple lighting devices 2, the lighting device 2 in which the first sensor 6 is located may have, for example, the configuration illustrated in Fig. 13. Moreover, among the multiple lighting devices 2, the lighting device 2 in which the first sensor 6 is not located may have, for example, the configuration illustrated in Fig. 9.

[0218] Here, for example, a case is assumed in which one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in this one lighting device 2 may transmit a signal related to the voltage detected by the first sensor 6 included in this one lighting device 2 to the second communication unit 42 of the control device 4. In other words, in the above-mentioned control method of the lighting system 1, in the above-mentioned second step, the first communication unit 24 in this one lighting device 2 may transmit a signal related to the voltage detected by the first sensor 6 included in this one lighting device 2 to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in one lighting device 2 detects the voltage of the power supplied from one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of one lighting device 2. If this configuration is adopted, the signal related to the voltage detected by the first sensor 6 in the lighting device 2 is transmitted to the control device 4 by the first communication unit 24 in the lighting device 2, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0219] For example, assume that the first lighting device 2a as one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in the first lighting device 2a may transmit a signal related to the voltage detected by the first sensor 6 included in the first lighting device 2a to the second communication unit 42 of the control device 4. In other words, in the above-mentioned second step, the first communication unit 24 in the first lighting device 2a may transmit a signal related to the voltage detected by the first sensor 6 included in the first lighting device 2a to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in the first lighting device 2a detects the voltage of the power supplied from one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of the first lighting device 2a. As a result, the signal related to the voltage detected by the first sensor 6 in the first lighting device 2a is transmitted to the control device 4 by the first communication unit 24 in the first lighting device 2a, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0220] For example, assume that the second lighting device 2b as one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in the second lighting device 2b may transmit a signal related to the voltage detected by the first sensor 6 included in the second lighting device 2b to the second communication unit 42 of the control device 4. In other words, in the above-mentioned second step, the first communication unit 24 in the second lighting device 2b may transmit a signal related to the voltage detected by the first sensor 6 included in the second lighting device 2b to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in the second lighting device 2b detects the voltage of the power supplied by one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of the second lighting device 2b. As a result, the signal related to the voltage detected by the first sensor 6 in the second lighting device 2b is transmitted to the control device 4 by the first communication unit 24 in the second lighting device 2b, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0221] For example, assume that the third lighting device 2c as one lighting device 2 included in the plurality of lighting devices 2 includes the first sensor 6. In this case, the first communication unit 24 in the third lighting device 2c may transmit a signal related to the voltage detected by the first sensor 6 included in the third lighting device 2c to the second communication unit 42 of the control device 4. In other words, in the above-mentioned second step, the first communication unit 24 in the third lighting device 2c may transmit a signal related to the voltage detected by the first sensor 6 included in the third lighting device 2c to the second communication unit 42 of the control device 4. Here, the first sensor 6 included in the third lighting device 2c detects the voltage of the power supplied by one or more power storage units 5 to the first control unit 23 and the first communication unit 24 of the third lighting device 2c. As a result, the signal related to the voltage detected by the first sensor 6 in the third lighting device 2c is transmitted to the control device 4 by the first communication unit 24 in the third lighting device 2c, so that the addition of a configuration for transmitting a signal related to the voltage can be reduced.

[0222] Here, as shown in FIG. 31, the lighting system 1 may include, for example, a second sensor 7 built into the control device 4, or may include a second sensor 7 located outside the control device 4. In FIG. 31, for convenience, the second sensor 7 located inside the control device 4 and the second sensor 7 located outside the control device 4 are drawn with thin dashed lines. For example, when the lighting system 1 includes the second sensor 7 built into the control device 4, the control device 4 may have, for example, the configuration illustrated in FIG. 26. Also, for example, when the lighting system 1 includes the second sensor 7 located outside the control device 4, the second sensor 7 may be electrically connected to the first D power line Lp1d. In this case, the second sensor 7 can detect the voltage of the power supplied from the power storage unit 5 to the control device 4 via the first D power line Lp1d. More specifically, the second sensor 7 can detect the voltage of the power supplied from the power storage unit 5 to the second control unit 41 and the second communication unit 42 of the control device 4 via the first D power line Lp1d. The second sensor 7 may transmit, for example, a signal related to the voltage as a measurement result to the control device 4 via a signal line. In FIG. 31, as an example, a signal line through which the second sensor 7 transmits a signal related to the voltage as a measurement result to the control device 4 is diagrammatically depicted by a thin dashed line.

[0223] Also, here, the lighting system 1 may include a sensor 8 electrically connected to the first base power line Lp1o of the first power line Lp1, for example, as shown in FIG. 32. In this case, the sensor 8 may be electrically connected to a portion of the first base power line Lp1o that is closer to each lighting device 2 and closer to the control device 4 than the portion to which the power storage unit 5 is electrically connected. For example, various voltage sensors may be applied to the sensor 8, as with the first sensor 6 and the second sensor 7. Thereby, the sensor 8 can detect the voltage of the power that the power storage unit 5 supplies to each of the multiple lighting devices 2 and the control device 4 via the first power line Lp1. More specifically, the sensor 8 can detect the voltage of the power that the power storage unit 5 supplies to the first control unit 23 and the first communication unit 24 of each lighting device 2, and the voltage of the power that the power storage unit 5 supplies to the second control unit 41 and the second control unit 41 of the control device 4 via the first power line Lp1. For example, the sensor 8 may transmit a signal related to the voltage as a measurement result directly to the control device 4 via a signal line, or may transmit the signal related to the voltage as a measurement result to the control device 4 via a signal line and any one of the multiple lighting devices 2. In Fig. 32, as an example, a signal line through which the sensor 8 directly transmits a signal related to the voltage as a measurement result to the control device 4 is diagrammatically depicted by a thin dashed line.

[0224] Here, the sensor 8 may function as the first sensor 6 described above, or may function as the second sensor 7 described above.

[0225] For example, in the case where the sensor 8 serves as the first sensor 6, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the sensor 8 as one or more sensors dropping to a first predetermined value Vp1 when the power supply device 3 is set to the second state. In other words, in the above-mentioned control method for the lighting system 1, in response to the voltage detected by the sensor 8 dropping to the first predetermined value Vp1 in the above-mentioned second step, the second control unit 41 may shift from the above-mentioned second step to the above-mentioned first step. The first predetermined value Vp1 may be a value larger than the above-mentioned first threshold value Vt1. In this case, the above-mentioned second condition may be, for example, a condition that the voltage detected by the sensor 8 has dropped to the first predetermined value Vp1. Here, the above-mentioned second condition is not limited to a condition that the voltage detected by the sensor 8 as one or more sensors has dropped to the first predetermined value Vp1. The second condition may be, for example, a condition in which a predetermined time has elapsed after the voltage detected by one or more sensors, such as sensor 8, has dropped to a first predetermined value Vp1.

[0226] For example, in the case where the sensor 8 serves as the second sensor 7, the second control unit 41 may set the power supply device 3 from the second state to the first state in response to the voltage detected by the sensor 8 as one or more sensors dropping to a second predetermined value Vp2 set in advance when the power supply device 3 is set to the second state. In other words, in the above-mentioned control method for the lighting system 1, in response to the voltage detected by the sensor 8 dropping to the second predetermined value Vp2 set in advance in the above-mentioned second step, the second control unit 41 may shift from the above-mentioned second step to the above-mentioned first step. The second predetermined value Vp2 may be a value larger than the above-mentioned second threshold value Vt2. In this case, the above-mentioned second condition may be, for example, a condition that the voltage detected by the sensor 8 has dropped to the second predetermined value Vp2 set in advance. Here, the above-mentioned second condition is not limited to a condition that the voltage detected by the sensor 8 as one or more sensors has dropped to the second predetermined value Vp2 set in advance. The second condition may be, for example, a condition in which a predetermined time has elapsed after the voltage detected by one or more sensors, such as sensor 8, has dropped to a predetermined second predetermined value Vp2.

[0227] <3.Other> In each of the above embodiments, for example, when starting to emit illumination light L1 from each of the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c, it is not necessary to start emitting the illumination light L1 from each of the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c simultaneously.

[0228] Fig. 33 is a timing diagram showing a reference example of the relationship between the timing of turning on the multiple lighting devices 2 in the lighting system 1 and the current output from the power supply device 3. Fig. 34 is a timing diagram showing an example of the relationship between the timing of turning on the multiple lighting devices 2 in the lighting system 1 according to each embodiment and the current output from the power supply device 3. Fig. 35 and Fig. 36 are each a timing diagram showing another example of the relationship between the timing of turning on the multiple lighting devices 2 in the lighting system 1 according to each embodiment and the current output from the power supply device 3.

[0229] 33 to 36, the horizontal axis indicates time, and from the top, solid lines indicate the time changes of [A] the state related to the turning on and off of the light source 21 of the first lighting device 2a, [B] the state related to the turning on and off of the light source 21 of the second lighting device 2b, [C] the state related to the turning on and off of the light source 21 of the third lighting device 2c, and [D] the current (output current) output from the power supply device 3. For the above [A] to [C] states related to the turning on and off of the light source 21, "ON" indicates the turned on state, and "OFF" indicates the turned off state.

[0230] Fig. 33 shows an example in which the light sources 21 of all the lighting devices 2, the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c, start emitting the illumination light L1 at the same time. In the example of Fig. 33, at time T1, the light source 21 of the first lighting device 2a starts emitting the illumination light L1, and the light source 21 of the first lighting device 2a is switched from an off state to an on state. At time T1, the light source 21 of the second lighting device 2b starts emitting the illumination light L1, and the light source 21 of the second lighting device 2b is switched from an off state to an on state. At time T1, the light source 21 of the third lighting device 2c starts emitting the illumination light L1, and the light source 21 of the third lighting device 2c is switched from an off state to an on state. When the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c are kept on, the output current of the power supply device 3 is a current (also called a steady-state current) I3. However, when the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c are simultaneously turned on, the output current of the power supply device 3 momentarily exhibits a maximum peak current (also called a reference peak current) Im0 that far exceeds the steady-state current I3. The difference (also called a reference difference) ΔI0 obtained by subtracting the steady-state current I3 from this reference peak current Im0 can be a very large value. In FIG. 33, a thick straight dashed line indicating the reference peak current Im0 is indicated.

[0231] 34 shows an example in which the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c start emitting illumination light L1 from the light source 21 in the order of description. More specifically, at time T1, the light source 21 of the first lighting device 2a starts emitting illumination light L1, and the light source 21 of the first lighting device 2a is switched from an off state to an on state. At time T2 after time T1, the light source 21 of the second lighting device 2b starts emitting illumination light L1, and the light source 21 of the second lighting device 2b is switched from an off state to an on state. At time T3 after time T2, the light source 21 of the third lighting device 2c starts emitting illumination light L1, and the light source 21 of the third lighting device 2c is switched from an off state to an on state. In this case, when the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c are turned on in sequence, the output current of each of the power supply devices 3 increases instantaneously, resulting in a maximum peak current (also referred to as a first peak current) Im1. However, the difference (also referred to as a first difference) ΔI1 obtained by subtracting the steady-state current I3 from the first peak current Im1 may be significantly smaller than the above-mentioned reference difference ΔI0. In FIG. 34, a straight thick two-dot chain line indicating the first peak current Im1 is shown. In addition, in FIG. 34, for comparison, a straight thin one-dot chain line indicating the reference peak current Im0 is shown.

[0232] 35 shows an example in which the light sources 21 of the first lighting device 2a and the third lighting device 2c start emitting the illumination light L1 at the same time, and then the light source 21 of the second lighting device 2b starts emitting the illumination light L1. More specifically, at time T1, the light source 21 of the first lighting device 2a starts emitting the illumination light L1, and the light source 21 of the first lighting device 2a is switched from an off state to an on state. At time T1, the light source 21 of the third lighting device 2c starts emitting the illumination light L1, and the light source 21 of the third lighting device 2c is switched from an off state to an on state. At time T2, the light source 21 of the second lighting device 2b starts emitting the illumination light L1, and the light source 21 of the second lighting device 2b is switched from an off state to an on state. In this case, when the light sources 21 of the first lighting device 2a and the third lighting device 2c are turned on simultaneously, and when the light source 21 of the second lighting device 2b is turned on, the output current of the power supply device 3 momentarily increases and exhibits the maximum peak current (also called the second peak current) Im2. However, the difference (also called the second difference) ΔI2 obtained by subtracting the steady-state current I3 from the second peak current Im2 may be significantly smaller than the above-mentioned reference difference ΔI0. In FIG. 35, a straight thick two-dot chain line indicating the second peak current Im2 is shown. In addition, in FIG. 35, for comparison, a straight thin one-dot chain line indicating the reference peak current Im0 is shown.

[0233] 36 shows an example in which the light source 21 of the first lighting device 2a starts emitting the illumination light L1, and then the light sources 21 of the second lighting device 2b and the third lighting device 2c start emitting the illumination light L1 at the same time. More specifically, at time T1, the light source 21 of the first lighting device 2a starts emitting the illumination light L1, and the light source 21 of the first lighting device 2a is switched from an off state to an on state. At time T2 after time T1, the light source 21 of the second lighting device 2b starts emitting the illumination light L1, and the light source 21 of the second lighting device 2b is switched from an off state to an on state. At time T2 after time T1, the light source 21 of the third lighting device 2c starts emitting the illumination light L1, and the light source 21 of the third lighting device 2c is switched from an off state to an on state. In this case, when the light source 21 of the first lighting device 2a is turned on and when the light sources 21 of the second lighting device 2b and the third lighting device 2c are turned on simultaneously, the output current of the power supply device 3 momentarily increases and exhibits the maximum peak current (also called the third peak current) Im3. However, the difference (also called the third difference) ΔI3 obtained by subtracting the steady-state current I3 from the third peak current Im3 may be smaller than the above-mentioned reference difference ΔI0. In FIG. 36, a straight thick two-dot chain line indicating the third peak current Im3 is shown. In addition, in FIG. 36, for comparison, a straight thin one-dot chain line indicating the reference peak current Im0 is shown.

[0234] 34 to 36, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the first lighting device 2a and the second lighting device 2b, the second control unit 41 may start to emit the illumination light L1 from the light sources 21 in the first lighting device 2a and the second lighting device 2b in sequence. In this case, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the first lighting device 2a and the second lighting device 2b in step S5 of Fig. 6, the second control unit 41 may start to emit the illumination light L1 from the light sources 21 in the first lighting device 2a and the second lighting device 2b in sequence. In other words, the control method of the lighting system 1 may have step S5 as a third step.

[0235] If this configuration is adopted, as compared to the case where illumination light L1 starts to be emitted simultaneously from the light sources 21 of the plurality of lighting devices 2 as shown in Fig. 34 to Fig. 36, for example, excessive peaks occurring in the current (output current) output from the power supply device 3 to the plurality of lighting devices 2 can be reduced. As a result, for example, it is possible to reduce the setting of the power supply capacity in the power supply device 3. Therefore, the manufacture of the power supply device 3 can be facilitated.

[0236] Here, for example, it is assumed that the second control unit 41 turns on each of the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c as the plurality of lighting devices 2 based on a signal from the wall switch 10 or the operation terminal 9 as an operation unit instructing to turn on. In other words, it is assumed that the second control unit 41 transmits a turn-on control signal for starting to emit the illumination light L1 from each light source 21 to the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c by the second communication unit 42 based on a signal from the wall switch 10 or the operation terminal 9 as an operation unit instructing to turn on each of the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c. In this case, for example, the second control unit 41 may transmit a turn-on control signal to the second lighting device 2b after transmitting the turn-on control signal to the first lighting device 2a and the third lighting device 2c by the second communication unit 42. As a result, as shown in Fig. 35, after starting emission of the illumination light L1 from each light source 21 of the first illumination device 2a and the third illumination device 2c, the light source 21 of the second illumination device 2b can start emission of the illumination light L1. Here, for example, the second control unit 41 may transmit a turn-on control signal to the second illumination device 2b and the third illumination device 2c after transmitting a turn-on control signal to the first illumination device 2a by the second communication unit 42. As a result, as shown in Fig. 36, after starting emission of the illumination light L1 from the light source 21 of the first illumination device 2a, the light source 21 of the second illumination device 2b and the third illumination device 2c can start emission of the illumination light L1.

[0237] 34, for example, when the second control unit 41 starts to emit the illumination light L1 from the light source 21 of each of the multiple lighting devices 2, the second control unit 41 may start to emit the illumination light L1 from the light source 21 in sequence in the multiple lighting devices 2. In this case, for example, in step S5 of FIG. 6, when the second control unit 41 starts to emit the illumination light L1 from the light source 21 of each of the multiple lighting devices 2, the second control unit 41 may start to emit the illumination light L1 from the light source 21 in sequence in the multiple lighting devices 2.

[0238] If this configuration is adopted, for example, as shown in Fig. 34, excessive peaks occurring in the current (output current) output from the power supply device 3 to the multiple lighting devices 2 can be further reduced compared to a case in which illumination light L1 starts to be emitted simultaneously from the light sources 21 of the multiple lighting devices 2. As a result, for example, the setting of the power supply capacity in the power supply device 3 can be further reduced. Therefore, the manufacture of the power supply device 3 can be further facilitated.

[0239] Here, for example, it is assumed that the second control unit 41 turns on each of the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c as the plurality of lighting devices 2 based on a signal instructing turning on from the wall switch 10 or the operation terminal 9 as the operation unit. In other words, it is assumed that the second control unit 41 transmits a turn-on control signal for starting to emit the illumination light L1 from each light source 21 to the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c by the second communication unit 42 based on a signal instructing turning on each of the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c from the wall switch 10 or the operation terminal 9 as the operation unit. In this case, for example, the second control unit 41 may transmit the turn-on control signal to the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c in order by the second communication unit 42. 34, the emission of the illumination light L1 from the light source 21 of the first illumination device 2a, the emission of the illumination light L1 from the light source 21 of the second illumination device 2b, and the emission of the illumination light L1 from the light source 21 of the third illumination device 2c can be started in this order. Here, the order in which the lighting control signals are transmitted to the first illumination device 2a, the second illumination device 2b, and the third illumination device 2c may be changed as appropriate. For example, if the lighting control signals are transmitted in the order of the first illumination device 2a, the second illumination device 2b, and the third illumination device 2c, the emission of the illumination light L1 from the light source 21 can be started in the order of the first illumination device 2a, the second illumination device 2b, and the third illumination device 2c. For example, if a lighting control signal is transmitted in the described order of the first lighting device 2a, the third lighting device 2c, and the second lighting device 2b, the illumination light L1 can be started to be emitted from the light source 21 in the described order of the first lighting device 2a, the third lighting device 2c, and the second lighting device 2b. For example, if a lighting control signal is transmitted in the described order of the third lighting device 2c, the second lighting device 2b, and the first lighting device 2a, the illumination light L1 can be started to be emitted from the light source 21 in the described order of the third lighting device 2c, the second lighting device 2b, and the first lighting device 2a.

[0240] Here, for example, the multiple lighting devices 2 are not limited to three lighting devices 2. For example, the multiple lighting devices 2 may be two or more lighting devices 2. For example, the multiple lighting devices 2 may include a first lighting device 2a and a second lighting device 2b, but may not include a third lighting device 2c. Also, for example, the multiple lighting devices 2 may be any number of lighting devices 2, such as four or more.

[0241] Fig. 37 is a diagram illustrating an example of the configuration of a lighting system 1. The lighting system 1 illustrated in Fig. 37 has a configuration in which the number of the lighting devices 2 is increased from three to nine, based on the lighting system 1 illustrated in Fig. 2.

[0242] In the example of FIG. 37, the plurality of lighting devices 2 are nine lighting devices 2. The lighting space H1 includes a first area (also referred to as the first area) A1, a second area (also referred to as the second area) A2, and a third area (third area) A3 as two or more areas. The nine lighting devices 2 include three lighting devices 2 as two or more lighting devices 2 that respectively emit illumination light L1 to the first area A1, three lighting devices 2 as two or more lighting devices 2 that respectively emit illumination light L1 to the second area A2, and three lighting devices 2 as two or more lighting devices 2 that respectively emit illumination light L1 to the third area A3. More specifically, the three lighting devices 2 that respectively emit illumination light L1 to the first area A1 are a first lighting device 2a, a second lighting device 2b, and a third lighting device 2c. The three lighting devices 2 that respectively emit the illumination light L1 to the second area A2 are a fourth lighting device 2d, a fifth lighting device 2e, and a sixth lighting device 2f. The three lighting devices 2 that respectively emit the illumination light L1 to the third area A3 are a seventh lighting device 2g, an eighth lighting device 2h, and a ninth lighting device 2i.

[0243] Fig. 38 is a timing chart showing an example of the timing of turning on the lighting devices 2 in the lighting system 1. Fig. 39 is a timing chart showing another example of the timing of turning on the lighting devices 2 in the lighting system 1. In each of Figures 38 and 39, the horizontal axis indicates time, and solid lines indicate changes over time for each of the following states, from top to bottom: [I] a state related to the turning on and off of the light source 21 of the first lighting device 2a, [II] a state related to the turning on and off of the light source 21 of the second lighting device 2b, [III] a state related to the turning on and off of the light source 21 of the third lighting device 2c, [IV] a state related to the turning on and off of the light source 21 of the fourth lighting device 2d, [V] a state related to the turning on and off of the light source 21 of the fifth lighting device 2e, [VI] a state related to the turning on and off of the light source 21 of the sixth lighting device 2f, [VII] a state related to the turning on and off of the light source 21 of the seventh lighting device 2g, [VIII] a state related to the turning on and off of the light source 21 of the eighth lighting device 2h, and [IX] a state related to the turning on and off of the light source 21 of the ninth lighting device 2i. Here, with regard to the states [I] to [IX] relating to the lighting and extinguishing of the light source 21, "ON" indicates a lighting state, and "OFF" indicates an extinguishing state.

[0244] 38, when the illumination light L1 is started to be emitted from each of the light sources 21 of the nine illumination devices 2, the emission of the illumination light L1 from each of the light sources 21 of the first illumination device 2a, the fourth illumination device 2d, and the seventh illumination device 2g, the emission of the illumination light L1 from each of the light sources 21 of the second illumination device 2b, the fifth illumination device 2e, and the eighth illumination device 2h, and the emission of the illumination light L1 from each of the light sources 21 of the third illumination device 2c, the sixth illumination device 2f, and the ninth illumination device 2i are started in the order described above. More specifically, at time Tm1, the emission of the illumination light L1 from each of the light sources 21 of the first illumination device 2a, the fourth illumination device 2d, and the seventh illumination device 2g is started, and each of the light sources 21 of the first illumination device 2a, the fourth illumination device 2d, and the seventh illumination device 2g is switched from the off state to the on state. At time Tm2 after time Tm1, the second lighting device 2b, the fifth lighting device 2e, and the eighth lighting device 2h start emitting the illumination light L1 from the light sources 21, and the second lighting device 2b, the fifth lighting device 2e, and the eighth lighting device 2h start switching from an off state to an on state. At time Tm3 after time Tm2, ​​the third lighting device 2c, the sixth lighting device 2f, and the ninth lighting device 2i start emitting the illumination light L1 from the light sources 21, and the third lighting device 2c, the sixth lighting device 2f, and the ninth lighting device 2i start switching from an off state to an on state. Here, nine lighting devices 2 as the multiple lighting devices 2 are divided into three groups as two or more groups corresponding to two or more areas of the lighting space H1. Then, the three lighting devices 2 as the two or more lighting devices 2 included in each group start emitting the illumination light L1 from the light sources 21 in sequence. In other words, the three lighting devices 2 (two or more lighting devices 2) sequentially start emitting the illumination light L1 from the light source 21 for each of the three areas (first area A1, second area A2, and third area A3).

[0245] In this case, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c in sequence. In other words, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c in step S5 of FIG. 6, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the first lighting device 2a, the second lighting device 2b, and the third lighting device 2c in sequence. Also, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the fourth lighting device 2d, the fifth lighting device 2e, and the sixth lighting device 2f, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the fourth lighting device 2d, the fifth lighting device 2e, and the sixth lighting device 2f in sequence. In other words, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the fourth lighting device 2d, the fifth lighting device 2e, and the sixth lighting device 2f in step S5 of FIG. 6, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the fourth lighting device 2d, the fifth lighting device 2e, and the sixth lighting device 2f in sequence. Also, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the seventh illumination device 2g, the eighth illumination device 2h, and the ninth illumination device 2i, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the seventh illumination device 2g, the eighth illumination device 2h, and the ninth illumination device 2i in sequence. In other words, for example, when the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the seventh illumination device 2g, the eighth illumination device 2h, and the ninth illumination device 2i in step S5 of FIG. 6, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 of the seventh illumination device 2g, the eighth illumination device 2h, and the ninth illumination device 2i in sequence.

[0246] This can reduce excessive peaks in the current (output current) output from the power supply device 3 to the multiple lighting devices 2, compared to when all the light sources 21 of the nine lighting devices 2 as the multiple lighting devices 2 start emitting the illumination light L1 simultaneously. As a result, for example, it is possible to reduce the setting of the power supply capacity in the power supply device 3. This can facilitate the manufacture of the power supply device 3.

[0247] In the example of Fig. 39, when the illumination light L1 is started to be emitted from each light source 21 of the nine illumination devices 2, the illumination light L1 is started to be emitted from the light sources 21 in the order of the first illumination device 2a, the fourth illumination device 2d, the seventh illumination device 2g, the second illumination device 2b, the fifth illumination device 2e, the eighth illumination device 2h, the third illumination device 2c, the sixth illumination device 2f, and the ninth illumination device 2i. More specifically, at time Tm1, the illumination light L1 is started to be emitted from the light source 21 of the first illumination device 2a, and the light source 21 of the first illumination device 2a is switched from the off state to the on state. At time Tm2 after time Tm1, the illumination light L1 is started to be emitted from the light source 21 of the fourth illumination device 2d, and the light source 21 of the fourth illumination device 2d is switched from the off state to the on state. At time Tm3 after time Tm2, ​​the light source 21 of the seventh lighting device 2g starts emitting the illumination light L1, and the light source 21 of the seventh lighting device 2g is switched from the off state to the on state. At time Tm4 after time Tm3, the light source 21 of the second lighting device 2b starts emitting the illumination light L1, and the light source 21 of the second lighting device 2b is switched from the off state to the on state. At time Tm5 after time Tm4, the light source 21 of the fifth lighting device 2e starts emitting the illumination light L1, and the light source 21 of the fifth lighting device 2e is switched from the off state to the on state. At time Tm6 after time Tm5, the light source 21 of the eighth lighting device 2h starts emitting the illumination light L1, and the light source 21 of the eighth lighting device 2h is switched from the off state to the on state. At time Tm7 after time Tm6, the light source 21 of the third lighting device 2c starts emitting the illumination light L1, and the light source 21 of the third lighting device 2c is switched from the off state to the on state. At time Tm8 after time Tm7, the light source 21 of the sixth lighting device 2f starts emitting the illumination light L1, and the light source 21 of the sixth lighting device 2f is switched from the off state to the on state. At time Tm9 after time Tm8, the light source 21 of the ninth lighting device 2i starts emitting the illumination light L1, and the light source 21 of the ninth lighting device 2i is switched from the off state to the on state.

[0248] In this case, for example, when the second control unit 41 starts to emit the illumination light L1 from each of the light sources 21 of the multiple lighting devices 2, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 in the multiple lighting devices 2 in sequence. In other words, for example, in step S5 of FIG. 6, when the second control unit 41 starts to emit the illumination light L1 from each of the light sources 21 of the multiple lighting devices 2, the second control unit 41 starts to emit the illumination light L1 from the light sources 21 in the multiple lighting devices 2 in sequence. This can further reduce excessive peaks that occur in the current (output current) output from the power supply device 3 to the multiple lighting devices 2, compared to the case where the emission of the illumination light L1 from all the light sources 21 of the nine lighting devices 2 as the multiple lighting devices 2 is started simultaneously. As a result, for example, the setting of the power supply capacity in the power supply device 3 can be further reduced. Therefore, the manufacturing of the power supply device 3 can be further facilitated.

[0249] Here, for example, the two or more lighting devices 2 each emitting illumination light L1 to the first area A1 are not limited to three lighting devices 2, and may be two lighting devices 2, or four or more lighting devices 2. For example, the two or more lighting devices 2 each emitting illumination light L1 to the second area A2 are not limited to three lighting devices 2, and may be two lighting devices 2, or four or more lighting devices 2. For example, the two or more lighting devices 2 each emitting illumination light L1 to the third area A3 are not limited to three lighting devices 2, and may be two lighting devices 2, or four or more lighting devices 2.

[0250] Also, for example, the illumination space H1 includes the first area A1, the second area A2, and the third area A3 as the two or more areas, but is not limited to this. For example, the illumination space H1 may include the first area A1 and the second area A2 as the two or more areas, and may not include the third area A3. For example, the illumination space H1 may include the first area A1, the second area A2, the third area A3, and one or more areas as the two or more areas.

[0251] In each of the above embodiments, for example, the second communication unit 42 of the control device 4 may have a circuit for communicating with each lighting device 2 and a circuit for communicating with the power supply device 3 separately.

[0252] In each of the above embodiments, for example, wired communication using a communication line may be replaced with wireless communication that does not require a communication line.

[0253] In each of the above embodiments, for example, the lighting space H1 may be a space within a room on one floor of a multi-story building, or a space in one of two or more areas that make up a room on one floor of a multi-story building.

[0254] In each of the above embodiments, for example, the second operating voltage is not limited to being the same as the first operating voltage, and the second operating voltage may be higher than the first operating voltage or may be lower than the first operating voltage. For example, if the second operating voltage is higher than the first operating voltage, the second threshold Vt2 may be higher than the first threshold Vt1, and the second predetermined value Vp2 may be higher than the first predetermined value Vp1. For example, if the second operating voltage is lower than the first operating voltage, the second threshold Vt2 may be lower than the first threshold Vt1, and the second predetermined value Vp2 may be lower than the first predetermined value Vp1.

[0255] In each of the above embodiments, for example, the operation terminal 9 may be an external device such as a personal computer. Here, for example, the third communication unit 45 may realize communication with the operation terminal 9 by wire. In this case, the communication standard of the third communication unit 45 is not particularly limited, but may be, for example, a communication standard such as Ethernet (registered trademark) with a communication speed of about 100 Mbps.

[0256] In each of the above embodiments, for example, the lighting system 1 may have a concentrator such as a network hub located on the first communication line Ln1. In this case, the concentrator may be electrically connected to each of the multiple lighting devices 2 and the control device 4 through the first communication line Ln1. The concentrator may realize communication between each of the multiple lighting devices 2 and the control device 4. Here, the concentrator may be installed in the installation space H2 together with the multiple lighting devices 2.

[0257] In each of the above embodiments, for example, either or both of the first processing circuit 231 and the second processing circuit 411 may be control circuitry and may include at least one processor to provide control and processing capabilities for performing various functions, as described in further detail below.

[0258] According to various embodiments, the at least one processor may be implemented as a single integrated circuit (IC) or as multiple communicatively connected integrated circuit ICs and / or discrete circuits. The at least one processor may be implemented according to various known techniques.

[0259] In one embodiment, a processor includes one or more circuits or units configured to perform one or more data computation procedures or processes, for example by executing instructions stored in associated memory. In other embodiments, a processor may be firmware (e.g., discrete logic components) configured to perform one or more data computation procedures or processes.

[0260] According to various embodiments, the processor may include one or more processors, controllers, microprocessors, microcontrollers, application specific integrated circuits (ASICs), digital signal processors, programmable logic devices, field programmable gate arrays, or any combination of these devices or configurations, or other known devices and configurations, to perform the functions described above.

[0261] As described above, the lighting system 1 and the control method of the lighting system 1 have been described in detail, but the above description is merely an example in all respects, and the lighting system 1 and the control method of the lighting system 1 are not limited thereto. It is understood that countless modified examples not exemplified can be imagined without departing from the scope of this disclosure. The configurations described in the above embodiments and examples (or aspects) can be appropriately combined or omitted as long as they are not mutually contradictory.

[0262] It goes without saying that all or part of the components constituting each of the above-described embodiments and various examples (or aspects) can be appropriately combined to the extent that no contradiction occurs.

[0263] This disclosure includes the following:

[0264] In one embodiment, (1) a lighting system includes a plurality of lighting devices each having a light source that emits illumination light, a light source drive circuit that supplies power to the light source, a first control unit that controls the light source drive circuit, and a first communication unit, a power supply device that supplies power to each of the plurality of lighting devices via a first power line, a second control unit that controls switching between on and off of the supply of power to the plurality of lighting devices by the power supply device, and a control device having a second communication unit that communicates with the first communication unit of each of the plurality of lighting devices, the lighting system including one or more power storage units electrically connected to the first power line, the second control unit alternately setting the power supply device to a first state and a second state during a standby state in which the light sources of all of the plurality of lighting devices are not emitting illumination light, and the first state is a state in which the power supply device supplies power to the plurality of lighting devices via the first power line. the second state is a state in which power is supplied to each of the plurality of lighting devices from the power supply device via the first power line, and when the power supply device is set to the first state, each of the one or more power storage units stores power in response to the supply of power from the power supply device via the first power line, and when the power supply device is set to the second state, the one or more power storage units supply power to the first control unit and the first communication unit in each of the plurality of lighting devices, and the second control unit sets the power supply device from the second state to the first state before a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of each of the plurality of lighting devices drops to a predetermined first threshold when the power supply device is set to the second state.

[0265] (2) The lighting system of (1) above may include one or more sensors that detect a voltage of power supplied by the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices, and the second control unit may set the power supply device from the second state to the first state in response to the voltage detected by the one or more sensors when the power supply device is set to the second state.

[0266] (3) In the lighting system of (2) above, the second control unit may set the power supply device from the second state to the first state in response to a drop in the voltage detected by the one or more sensors to a first predetermined value greater than the first threshold value when the power supply device is set to the second state.

[0267] (4) In the lighting system of (2) or (3) above, the plurality of lighting devices may include one lighting device, and the one or more sensors may include a first sensor that detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, the one lighting device may include the first sensor, and the first communication unit in the one lighting device may transmit a signal related to the voltage detected by the first sensor to the second communication unit.

[0268] (5) In the lighting system of (4) above, the one or more sensors may include a plurality of first sensors, each of the plurality of lighting devices may include one first sensor among the plurality of first sensors, and in each of the plurality of lighting devices, the one first sensor may detect a voltage of power supplied by the one or more power storage units to the first control unit and the first communication unit, and in each of the plurality of lighting devices, the first communication unit may transmit a signal related to the voltage detected by the one first sensor to the second communication unit.

[0269] (6) In the lighting system of (1) above, the one or more power storage units may include one power storage unit that supplies power to the control device via the first power line, the first state being a state in which power is supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, and the second state being a state in which power is not supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, and when the power supply device is set to the second state, the one power storage unit supplies power to the second control unit and the second communication unit, and when the power supply device is set to the second state, the second control unit may set the power supply device from the second state to the first state before a voltage of power supplied from the one or more power storage units to the second control unit and the second communication unit drops to a predetermined second threshold value.

[0270] (7) The lighting system of (6) above may include a sensor that detects a voltage of the power supplied from the one or more power storage units to the second control unit and the second communication unit, and when the power supply device is set to the second state, the second control unit may set the power supply device from the second state to the first state in response to the voltage detected by the sensor.

[0271] (8) In the lighting system of (7) above, the second control unit may set the power supply device from the second state to the first state in response to a drop in the voltage detected by the sensor to a second predetermined value greater than the second threshold value when the power supply device is set to the second state.

[0272] (9) In the lighting system of (7) or (8) above, the sensor may include a second sensor that detects a voltage of the power supplied from the one or more power storage units to the second control unit and the second communication unit, and the control device may include the second sensor.

[0273] (10) The lighting system of (6) above includes one or more first sensors that detect a voltage of power that the one or more power storage units supply to the first control unit and the first communication unit in each of the plurality of lighting devices, and a second sensor that detects a voltage of power that the one or more power storage units supply to the second control unit and the second communication unit, and when the power supply device is set to the second state, the second control unit may set the power supply device from the second state to the first state in response to the voltage detected by the one or more first sensors and the voltage detected by the second sensor.

[0274] (11) In the lighting system of (10) above, the second control unit may set the power supply device from the second state to the first state in response to a drop in the voltage detected by the one or more first sensors to a first predetermined value greater than the first threshold value, or a drop in the voltage detected by the second sensor to a second predetermined value greater than the second threshold value, when the power supply device is set to the second state.

[0275] (12) In the lighting system of (10) or (11) above, the plurality of lighting devices may include one lighting device, the one or more first sensors may include one first sensor detecting a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, the one lighting device may include the one first sensor, the first communication unit in the one lighting device may transmit a signal related to the voltage detected by the one first sensor to the second communication unit, and the control device may include the second sensor.

[0276] (13) In the lighting system of (12) above, the one or more first sensors may include a plurality of first sensors, each of the plurality of lighting devices may include one first sensor among the plurality of first sensors, and in each of the plurality of lighting devices, the one first sensor may detect a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit, and in each of the plurality of lighting devices, the first communication unit may transmit a signal related to the voltage detected by the one first sensor to the second communication unit.

[0277] (14) Any one of the lighting systems described above in (1) to (5) may include a second power line that does not connect the power supply device and the control device and supplies power to the control device.

[0278] (15) In the lighting system of any one of (1) to (14) above, the plurality of lighting devices may include a first lighting device and a second lighting device, and the second control unit may, when starting to emit illumination light from the light source of each of the first lighting device and the second lighting device, start to emit illumination light from the light source in the first lighting device and the second lighting device sequentially.

[0279] (16) In the lighting system of (15) above, when the second control unit starts to emit illumination light from the light source of each of the plurality of lighting devices, the second control unit may start to emit illumination light from the light source in sequence in the plurality of lighting devices.

[0280] (17) A method for controlling a lighting system, the lighting system including a plurality of lighting devices each having a light source that emits illumination light, a light source drive circuit that supplies power to the light source, a first control unit that controls the light source drive circuit, and a first communication unit, a power supply device that supplies power to each of the plurality of lighting devices via a first power line, a control device having a second control unit that controls switching between on and off of the supply of power to the plurality of lighting devices by the power supply device, and a second communication unit that communicates with the first communication unit of each of the plurality of lighting devices, and one or more power storage units electrically connected to the first power line, the method for controlling the lighting system including a first step of setting the power supply device to a first state by the second control unit, and a control device having a second communication unit that controls the power supply device to switch between on and off of the supply of power to the plurality of lighting devices and the first communication unit of each of the plurality of lighting devices, the control device including one or more power storage units electrically connected to the first power line, the control device including a first step of setting the power supply device to a first state by the second control unit, the control device being configured to switch between on and off of the supply of power to the plurality of lighting devices and the first communication ... and a second step in which the power supply device is set to a second state, the first state being a state in which power is supplied from the power supply device to each of the plurality of lighting devices via the first power line, and the second state being a state in which power is not supplied from the power supply device to each of the plurality of lighting devices via the first power line, in the first step, each of the one or more power storage units stores power in response to the supply of power from the power supply device via the first power line, and in the second step, the one or more power storage units supply power to the first control unit and the first communication unit in each of the plurality of lighting devices, and the second control unit transitions from the second step to the first step before a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of each of the plurality of lighting devices drops to a predetermined first threshold.

[0281] (18) In the control method for a lighting system of (17) above, the lighting system may include one or more sensors that detect a voltage of power supplied by the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices, and in the second step, the second control unit may transition from the second step to the first step depending on the voltage detected by the one or more sensors.

[0282] (19) In the lighting system control method of (18) above, in the second step, the second control unit may transition from the second step to the first step in response to a drop in the voltage detected by the one or more sensors to a first predetermined value greater than the first threshold value.

[0283] (20) In the lighting system control method of (18) or (19) above, the plurality of lighting devices may include one lighting device, the one or more sensors may include a first sensor that detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, the one lighting device may include the first sensor, and in the second step, a signal related to the voltage detected by the first sensor may be transmitted to the second communication unit by the first communication unit in the one lighting device.

[0284] (21) In the lighting system control method of (20) above, the one or more sensors may include a plurality of first sensors, each of the plurality of lighting devices may include one first sensor among the plurality of first sensors, and in each of the plurality of lighting devices, the one first sensor may detect a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit, and in the second step, in each of the plurality of lighting devices, a signal related to the voltage detected by the one first sensor may be transmitted to the second communication unit by the first communication unit.

[0285] (22) In the method of controlling a lighting system described above in (17), the one or more power storage units may include one power storage unit that supplies power to the control device via the first power line, the first state being a state in which power is supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, and the second state being a state in which power is not supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, and in the second step, the one or more power storage units may supply power to the second control unit and the second communication unit, and the second step may be transitioned from the second step to the first step by the second control unit before a voltage of the power supplied from the one or more power storage units to the second control unit and the second communication unit drops to a predetermined second threshold.

[0286] (23) In the control method for a lighting system of (22) above, the lighting system may include a sensor that detects a voltage of the power supplied by the one or more power storage units to the second control unit and the second communication unit, and in the second step, the second control unit may transition from the second step to the first step depending on the voltage detected by the sensor.

[0287] (24) In the lighting system control method of (23) above, in the second step, the second control unit may transition from the second step to the first step in response to a drop in the voltage detected by the sensor to a second predetermined value greater than the second threshold value.

[0288] (25) In the control method for a lighting system of (22) above, the lighting system may include one or more first sensors detecting a voltage of power supplied by the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices, and a second sensor detecting a voltage of power supplied by the one or more power storage units to the second control unit and the second communication unit, and in the second step, the second control unit may transition from the second step to the first step depending on the voltage detected by the one or more first sensors and the voltage detected by the second sensor.

[0289] (26) In the lighting system control method of (25) above, in the second step, the second control unit may transition from the second step to the first step in response to a drop in the voltage detected by the one or more first sensors to a first predetermined value greater than the first threshold value, or a drop in the voltage detected by the second sensor to a second predetermined value greater than the second threshold value.

[0290] (27) In the lighting system control method of (25) or (26) above, the plurality of lighting devices may include one lighting device, the one or more first sensors may include one first sensor detecting a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, the one lighting device may include the one first sensor, and the control unit may include the second sensor, and in the second step, a signal related to the voltage detected by the one first sensor may be transmitted to the second communication unit by the first communication unit in the one lighting device.

[0291] (28) In the lighting system control method of (27) above, the one or more first sensors may include a plurality of first sensors, each of the plurality of lighting devices may include one first sensor among the plurality of first sensors, and in the second step, in each of the plurality of lighting devices, a signal related to a voltage of power supplied by the one or more power storage units to the first control unit and the first communication unit, detected by the one first sensor, may be transmitted to the second communication unit by the first communication unit.

[0292] (29) In any one of the above lighting system control methods (17) to (28), the plurality of lighting devices may include a first lighting device and a second lighting device, and the lighting system control method may further include a third step of, when the second control unit starts to emit illumination light from the light sources of the first lighting device and the second lighting device, sequentially starting to emit illumination light from the light sources of the first lighting device and the second lighting device.

[0293] (30) In the control method for a lighting system described in (29) above, in the third step, when the second control unit starts to emit illumination light from the light source of each of the plurality of lighting devices, the second control unit may start to emit illumination light from the light source in sequence in the plurality of lighting devices. [Explanation of symbols]

[0294] 1. Lighting system 2. Lighting equipment 21 Light source 22 Light source driving circuit 23 First Control Section 24 First Communications Department 2a 1st lighting device 2b 2nd lighting device 3 Power supply device 4. Control device 41 Second Control Section 42 2nd Communications Department 5. Power storage unit 6 First Sensor 7 Second Sensor 8 Sensors L1 illumination light Lp1 First power line Lp2 2nd power line Vp1 1st predetermined value Vp2 Second predetermined value Vt1 First Threshold Vt2 Second Threshold

Claims

1. 1. A lighting system comprising: a plurality of lighting devices each including a light source that emits illumination light, a light source drive circuit that supplies power to the light source, a first control unit that controls the light source drive circuit, and a first communication unit; a power supply device that supplies power to each of the plurality of lighting devices via a first power line; a control device including a second control unit that controls switching between supplying and not supplying power to the plurality of lighting devices by the power supply device, and a second communication unit that communicates with the first communication unit of each of the plurality of lighting devices, the lighting system includes one or more power storage units electrically connected to the first power line; the second control unit alternately sets the power supply device between a first state and a second state during a standby state in which the light sources of all of the plurality of lighting devices are not emitting illumination light, the first state is a state in which power is supplied from the power supply device to each of the plurality of lighting devices via the first power line, the second state is a state in which power is not supplied from the power supply device to each of the plurality of lighting devices via the first power line, When the power supply device is set to the first state, each of the one or more power storage units stores power in response to power supply from the power supply device via the first power line; When the power supply device is set to the second state, the one or more power storage units supply power to the first control unit and the first communication unit in each of the plurality of lighting devices; a second control unit that, when the power supply device is set to the second state, sets the power supply device from the second state to the first state before a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of each of the plurality of lighting devices drops to a predetermined first threshold.

2. 2. A lighting system according to claim 1, one or more sensors that detect a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices; The second control unit, when the power supplying device is set to the second state, sets the power supplying device from the second state to the first state in response to a voltage detected by the one or more sensors.

3. 3. A lighting system according to claim 2, The second control unit sets the power supplying device from the second state to the first state in response to a drop in the voltage detected by the one or more sensors to a first predetermined value greater than the first threshold value when the power supplying device is set to the second state.

4. 4. A lighting system according to claim 2 or claim 3, the plurality of lighting devices includes one lighting device, the one or more sensors include a first sensor that detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, The one lighting device includes the first sensor, A lighting system, wherein the first communication unit in the one lighting device transmits a signal related to a voltage detected by the first sensor to the second communication unit.

5. 5. A lighting system according to claim 4, the one or more sensors include a plurality of first sensors; each of the plurality of lighting devices includes a first sensor among the plurality of first sensors; In each of the plurality of lighting devices, the one first sensor detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit; A lighting system, wherein in each of the plurality of lighting devices, the first communication unit transmits a signal related to a voltage detected by the one first sensor to the second communication unit.

6. 2. A lighting system according to claim 1, the one or more power storage units include one power storage unit that supplies power to the control device via the first power line, the first state is a state in which power is supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, the second state is a state in which power is not supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, When the power supply device is set to the second state, the one power storage unit supplies power to the second control unit and the second communication unit; When the power supplying device is set to the second state, the second control unit sets the power supplying device from the second state to the first state before a voltage of power supplied from the one or more power storage units to the second control unit and the second communication unit drops to a predetermined second threshold.

7. 7. A lighting system according to claim 6, a sensor for detecting a voltage of power supplied from the one or more power storage units to the second control unit and the second communication unit, A lighting system, wherein the second control unit, when the power supplying device is set to the second state, sets the power supplying device from the second state to the first state in response to a voltage detected by the sensor.

8. 8. A lighting system according to claim 7, The second control unit, when the power supplying device is set to the second state, sets the power supplying device from the second state to the first state in response to a drop in the voltage detected by the sensor to a second predetermined value greater than the second threshold value.

9. 9. A lighting system according to claim 7 or claim 8, the sensor includes a second sensor that detects a voltage of power supplied from the one or more power storage units to the second control unit and the second communication unit; The control device includes the second sensor.

10. 7. A lighting system according to claim 6, one or more first sensors that detect a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices; a second sensor that detects a voltage of the power supplied from the one or more power storage units to the second control unit and the second communication unit, A lighting system, wherein when the power supplying device is set to the second state, the second control unit sets the power supplying device from the second state to the first state in response to a voltage detected by the one or more first sensors and a voltage detected by the second sensor.

11. 11. A lighting system according to claim 10, The second control unit sets the power supplying device from the second state to the first state in response to a drop in the voltage detected by the one or more first sensors to a first predetermined value greater than the first threshold, or a drop in the voltage detected by the second sensor to a second predetermined value greater than the second threshold, when the power supplying device is set to the second state.

12. 12. A lighting system according to claim 10 or 11, the plurality of lighting devices includes one lighting device, the one or more first sensors include a first sensor that detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, the one lighting device includes the one first sensor; the first communication unit in the one lighting device transmits a signal related to a voltage detected by the one first sensor to the second communication unit; The control device includes the second sensor.

13. 13. A lighting system according to claim 12, the one or more first sensors include a plurality of first sensors; each of the plurality of lighting devices includes a first sensor among the plurality of first sensors; In each of the plurality of lighting devices, the one first sensor detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit; A lighting system, wherein in each of the plurality of lighting devices, the first communication unit transmits a signal related to a voltage detected by the one first sensor to the second communication unit.

14. A lighting system according to any one of claims 1 to 3, A lighting system comprising: a second power line that does not connect the power supply device and the control device and supplies power to the control device.

15. A lighting system according to any one of claims 1 to 3, claims 6 to 8, claims 10 and claims 11, comprising: the plurality of lighting devices include a first lighting device and a second lighting device; A lighting system in which, when the second control unit starts emitting illumination light from the light source of each of the first lighting device and the second lighting device, the second control unit starts emitting illumination light from the light source in the first lighting device and the second lighting device sequentially.

16. 16. A lighting system according to claim 15, The second control unit, when starting to emit illumination light from the light source of each of the plurality of lighting devices, sequentially starts to emit illumination light from the light source in each of the plurality of lighting devices.

17. 1. A method for controlling a lighting system, comprising: The lighting system comprises: a plurality of lighting devices each including a light source that emits illumination light, a light source drive circuit that supplies power to the light source, a first control unit that controls the light source drive circuit, and a first communication unit; a power supply device that supplies power to each of the plurality of lighting devices via a first power line; a control device having a second control unit that controls switching between supplying and not supplying power to the plurality of lighting devices by the power supply device, and a second communication unit that communicates with the first communication unit of each of the plurality of lighting devices; one or more power storage units electrically connected to the first power line; The method for controlling a lighting system includes: a first step in which the second control unit sets the power supply device to a first state and a second step in which the second control unit sets the power supply device to a second state, the first step and the second step being alternately executed during a standby state in which the light sources of all of the plurality of lighting devices are not emitting illumination light; the first state is a state in which power is supplied from the power supply device to each of the plurality of lighting devices via the first power line, the second state is a state in which power is not supplied from the power supply device to each of the plurality of lighting devices via the first power line, In the first step, each of the one or more power storage units stores power in response to a supply of power from the power supply device via the first power line; a first control unit and a first communication unit in each of the lighting devices, the first control unit and the first communication unit being connected to the first power storage unit and the first control unit being connected to the first communication ... communication unit being connected to the first communication unit and the first control unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the first communication unit being connected to the first communication unit and the

18. 18. A method for controlling a lighting system according to claim 17, comprising the steps of: the lighting system includes one or more sensors that detect a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices; A method for controlling a lighting system, wherein in the second step, the second step is transitioned to the first step by the second control unit depending on the voltage detected by the one or more sensors.

19. 20. A method for controlling a lighting system according to claim 18, comprising the steps of: A method for controlling a lighting system, wherein in the second step, the second control unit transitions from the second step to the first step in response to a drop in the voltage detected by the one or more sensors to a first predetermined value greater than the first threshold.

20. 20. A method for controlling a lighting system according to claim 18 or 19, comprising the steps of: the plurality of lighting devices includes one lighting device, the one or more sensors include a first sensor that detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, The one lighting device includes the first sensor, A method for controlling a lighting system, wherein in the second step, a signal related to the voltage detected by the first sensor is transmitted to the second communication unit by the first communication unit in the one lighting device.

21. 21. A method for controlling a lighting system according to claim 20, comprising the steps of: the one or more sensors include a plurality of first sensors; each of the plurality of lighting devices includes a first sensor among the plurality of first sensors; In each of the plurality of lighting devices, the one first sensor detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit; A method for controlling a lighting system, wherein in the second step, in each of the plurality of lighting devices, the first communication unit transmits a signal related to the voltage detected by the one first sensor to the second communication unit.

22. 18. A method for controlling a lighting system according to claim 17, comprising the steps of: the one or more power storage units include one power storage unit that supplies power to the control device via the first power line, the first state is a state in which power is supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, the second state is a state in which power is not supplied from the power supply device to the control device and each of the plurality of lighting devices via the first power line, a control method for a lighting system, in which, in the second step, the one or more power storage units supply power to the second control unit and the second communication unit, and the second control unit transitions from the second step to the first step before a voltage of the power supplied from the one or more power storage units to the second control unit and the second communication unit drops to a predetermined second threshold.

23. 23. A method for controlling a lighting system according to claim 22, comprising the steps of: the lighting system includes a sensor that detects a voltage of power supplied from the one or more power storage units to the second control unit and the second communication unit, A method for controlling a lighting system, wherein in the second step, the second control unit transitions from the second step to the first step depending on the voltage detected by the sensor.

24. 24. A method for controlling a lighting system according to claim 23, comprising the steps of: A method for controlling a lighting system, wherein in the second step, the second control unit transitions from the second step to the first step in response to a drop in the voltage detected by the sensor to a second predetermined value greater than the second threshold value.

25. 23. A method for controlling a lighting system according to claim 22, comprising the steps of: The lighting system comprises: one or more first sensors that detect a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit in each of the plurality of lighting devices; a second sensor that detects a voltage of the power supplied from the one or more power storage units to the second control unit and the second communication unit, A method for controlling a lighting system, in which in the second step, the second control unit transitions from the second step to the first step depending on the voltage detected by the one or more first sensors and the voltage detected by the second sensor.

26. 26. A method for controlling a lighting system according to claim 25, comprising the steps of: A method for controlling a lighting system, wherein in the second step, the second control unit transitions from the second step to the first step in response to a drop in the voltage detected by the one or more first sensors to a first predetermined value greater than the first threshold, or a drop in the voltage detected by the second sensor to a second predetermined value greater than the second threshold.

27. A method for controlling a lighting system according to claim 25 or 26, comprising the steps of: the plurality of lighting devices includes one lighting device, the one or more first sensors include a first sensor that detects a voltage of power supplied from the one or more power storage units to the first control unit and the first communication unit of the one lighting device, the one lighting device includes the one first sensor; The control device includes the second sensor. A method for controlling a lighting system, wherein in the second step, a signal related to the voltage detected by the one first sensor is transmitted to the second communication unit by the first communication unit in the one lighting device.

28. 28. A method for controlling a lighting system according to claim 27, comprising the steps of: the one or more first sensors include a plurality of first sensors; each of the plurality of lighting devices includes a first sensor among the plurality of first sensors; A method for controlling a lighting system, wherein in the second step, in each of the plurality of lighting devices, a signal related to the voltage of the power supplied from the one or more power storage units detected by the one first sensor to the first control unit and the first communication unit is transmitted by the first communication unit to the second communication unit.

29. A method for controlling a lighting system according to any one of claims 17 to 19 and claims 22 to 26, comprising: the plurality of lighting devices include a first lighting device and a second lighting device; The method for controlling a lighting system includes: a third step of causing the first lighting device and the second lighting device to sequentially start emitting illumination light from their light sources when the second control unit starts emitting illumination light from the light sources of each of the first lighting device and the second lighting device.

30. 30. A method for controlling a lighting system according to claim 29, comprising the steps of: A method for controlling a lighting system, wherein in the third step, when the second control unit starts to emit illumination light from the light source of each of the plurality of lighting devices, the second control unit starts to emit illumination light from the light source in sequence in the plurality of lighting devices.

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