Lighting system

Abstract

To provide a lighting system capable of performing dimming control based on a dimming control signal even for a luminaire which cannot receive the dimming control signal from a dimmer via a cable.SOLUTION: A lighting system 1 includes a master unit (a luminaire 12 with a radio function) which receives a dimming control signal from a dimmer 15 via a cable and transmits a radio signal based on the dimming control signal, and a lighting slave unit (one or more luminaires 51 with a radio function) which is dimming-controlled based on the radio signal. The lighting slave unit cannot receive the dimming control signal from the dimmer 15 via a wire.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a lighting system including a dimmer and a lighting fixture whose dimming is controlled based on a dimming control signal from the dimmer. [Background technology]

[0002] A conventional lighting system is described in Patent Document 1. This lighting system includes a phase control dimmer and a plurality of lighting fixtures that receive a phase control signal from the phase control dimmer via a wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-217688 Summary of the Invention [Problem to be solved by the invention]

[0004] The same dimming control can be applied to multiple lighting fixtures that receive dimming control signals from the dimmer via a wired connection, and for example, the dimming rate, which represents the brightness ratio to the rated brightness, can be controlled to be the same for the multiple lighting fixtures.

[0005] In this context, it would be desirable if lighting fixtures that cannot receive dimming control signals from a dimmer via a wire, for example, lighting fixtures that are newly installed after a wired lighting system equipped with a dimmer has been constructed, could perform dimming control based on dimming control signals from an existing dimmer, as this would enable unified lighting scenes to be created with a high degree of freedom.

[0006] Therefore, an object of the present disclosure is to provide a lighting system that can perform dimming control based on a dimming control signal even for lighting fixtures that cannot receive a dimming control signal from a dimmer via a wire. [Means for solving the problem]

[0007] In order to solve the above problem, a first lighting system according to the present disclosure includes a master unit that receives a dimming control signal from a dimmer via a wired connection and transmits a wireless signal based on the dimming control signal, and one or more slave lighting units that are dimmed based on the wireless signal.

[0008] Furthermore, a second lighting system according to the present disclosure includes a first master unit that receives a first dimming control signal from a first dimmer via a wired connection and transmits a first wireless signal based on the first dimming control signal, one or more first lighting slave units that are dimmed based on the first wireless signal, a second master unit that receives a second dimming control signal from a second dimmer via a wired connection and transmits a second wireless signal based on the second dimming control signal, and one or more second lighting slave units that are dimmed based on the second wireless signal, wherein the first master unit has a first selection unit that can select one first communication channel from a plurality of communication channels, and the second master unit has a second selection unit that can select one second communication channel from the plurality of communication channels, wherein the first master unit communicates wirelessly with at least one first lighting slave unit based on the first communication channel, and the second master unit communicates wirelessly with at least one second lighting slave unit based on the second communication channel, and the first communication channel and the second communication channel can be selected independently from the plurality of communication channels.

[0009] The dimming control performed by the lighting system of the present disclosure includes color adjustment control, illuminance adjustment control (brightness control), and control for selectively turning on or off the light. [Effects of the Invention]

[0010] According to the lighting system of the present disclosure, even for lighting fixtures that cannot receive a dimming control signal from a dimmer via a wire, dimming control can be performed based on the dimming control signal. [Brief explanation of the drawings]

[0011] [Figure 1]1 is a configuration diagram of a lighting system according to a first embodiment of the present disclosure. [Figure 2] 10 is a diagram for explaining a case where control is performed with the same dimming rate in a specification in which the master unit and the lighting slave unit are supplied with power from different power sources. FIG. [Figure 3] FIG. 4 is a signal waveform diagram showing an example of a dimming control signal output by a dimmer based on a dimming operation of the dimmer by a user. [Figure 4] 10 is a graph showing an example of the dimming ratio of a lighting fixture achieved by two different control ICs for the same phase angle of a dimming control signal. [Figure 5] FIG. 10 is a configuration diagram of a lighting system according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that, when multiple embodiments or variations are included below, it is assumed from the beginning that new embodiments can be constructed by appropriately combining their characteristic features. In the following examples, the same components are designated by the same reference numerals in the drawings, and redundant explanations will be omitted. Furthermore, among the components described below, components that are not recited in the independent claims that represent the highest concepts are optional components and are not essential components.

[0013] (First embodiment) FIG. 1 is a configuration diagram of a lighting system 1 according to a first embodiment of the present disclosure. As shown in FIG. 1, the lighting system 1 includes a first circuit 10 and a second circuit 50 that are independently connected to the same AC power source 5 by wire. The first circuit 10 and the second circuit 50 may be electrically connected to different AC power sources by wire. The first circuit 10 includes one or more lighting fixtures 11 and one or more wireless function-enabled lighting fixtures 12; in the example shown in FIG. 1, the first circuit 10 includes two lighting fixtures 11 and one wireless function-enabled lighting fixture 12. The first circuit 10 further includes a power switch 13 that simultaneously turns on or off all of the lighting fixtures 11 and 12 included in the first circuit 10.

[0014] When the lighting system 1 includes a plurality of lighting fixtures 11, the plurality of lighting fixtures 11 may be the same lighting fixture or may include two or more different lighting fixtures. Also, when the lighting system 1 includes a plurality of wireless-enabled lighting fixtures 12, the plurality of wireless-enabled lighting fixtures 12 may be the same lighting fixture or may include two or more different lighting fixtures.

[0015] All of the lighting fixtures (in this embodiment, two lighting fixtures 11 and one wireless function-equipped lighting fixture 12) electrically connected to each other via a wired network in the first circuit 10 are electrically connected via wires to a phase control dimmer (hereinafter simply referred to as a dimmer) 15 and an AC power source 5. In the example shown in FIG. 1 , all of the lighting fixtures 11 and 12 are connected in parallel to the AC power source 5 via a single dimmer 15 that simultaneously dims all of the lighting fixtures 11 and 12. The wireless function-equipped lighting fixture 12 constitutes a master unit. In this embodiment, the master unit is lighting fixture 12, but the master unit may be any device that can transmit a wireless signal based on a dimming control signal from the dimmer, and does not have to be a lighting fixture.

[0016] Dimmer 15 controls the phase of AC power supply 5 based on the user's operation of an adjustment knob (volume) to control the supply and cut-off of input power from AC power supply 5 to each of lighting fixtures 11 and 12, thereby adjusting the brightness of the light source (not shown) in each of lighting fixtures 11 and 12. As will be described below with reference to FIG. 2, power switch 13 and a rotary adjustment knob for adjusting the brightness of lighting fixtures 11 and 12 may be provided integrally in a switch unit, or the switch unit may be attached to a wall or the like in a room.

[0017] Wireless function-equipped lighting fixture 12 has communication device 12a, which transmits a wireless signal based on a dimming control signal received from dimmer 15. Communication device 12a is configured with a known interface capable of wirelessly transmitting information to an external device, and preferably is configured with a known interface capable of wirelessly transmitting and receiving information to and from an external device. The communication standard for the wireless signal may be any existing standard, and examples of such communication standards include Bluetooth (registered trademark), Wi-Fi (registered trademark), and IrDA (infrared communication).

[0018] The second circuit 50 includes one or more wireless-function lighting fixtures 51, and in the example shown in FIG. 1 , includes one wireless-function lighting fixture 51. The second circuit 50 also includes a power switch 53 that simultaneously turns on or off the one or more wireless-function lighting fixtures 51. The one or more wireless-function lighting fixtures 51 are electrically connected to an AC power source 5, for example, connected in parallel to the AC power source 5. The one or more wireless-function lighting fixtures 51 included in the second circuit 50 are configured not to receive a dimming control signal from the dimmer 15 via a wired connection. Note that when the lighting system 1 includes multiple wireless-function lighting fixtures 51, the multiple wireless-function lighting fixtures 51 may be the same lighting fixture, or may include two or more different lighting fixtures.

[0019] The wireless function-equipped lighting fixture 51 constitutes a lighting slave unit. The wireless function-equipped lighting fixture 51 has a communication device 51a and receives wireless signals transmitted by the wireless function-equipped lighting fixture 12. As a result, the wireless function-equipped lighting fixture 51 can perform dimming control based on a dimming control signal from the dimmer 15. For example, the dimming rate, which represents the ratio of brightness to rated brightness of each lighting fixture 11, 12, 51, can be controlled to be the same for all lighting fixtures 11, 12, 51 included in the first circuit 10 and the second circuit 50. The communication device 51a is configured with a known interface capable of wirelessly receiving information from an external device, and preferably is configured with a known interface capable of wirelessly transmitting and receiving information to and from an external device.

[0020] 2A and 2B are diagrams illustrating a case where the master unit and the slave lighting units are controlled to have the same dimming rate in a specification in which power is supplied from different power sources. In the example shown in Fig. 2A, as shown in Fig. 2A, wireless function-equipped lighting fixture 112 constituting the master unit is electrically connected to AC power source A via dimmer 115, and wireless function-equipped lighting fixture 151 constituting the slave lighting unit is electrically connected to AC power source B, which is different from AC power source A.

[0021] The dimming of the wireless function lighting device 112 is controlled based on a dimming control signal from the dimmer 115. The wireless function lighting device 112 transmits a wireless signal based on the dimming control signal from the dimmer 115 to the wireless function lighting device 151, and the wireless function lighting device 151 receives the wireless signal. This makes it possible to perform dimming control on the wireless function lighting device 151 based on the dimming control signal from the dimmer 115, and as shown in FIG. 2(b), it becomes possible to control the dimming rate of the wireless function lighting device 112 and the wireless function lighting device 151 to be the same.

[0022] In the example shown in FIG. 2(a), a rotary control knob 112a for adjusting the brightness of the dimmer 115 and a power switch 113 for turning the wireless function-equipped lighting fixture 112 on or off are integrally provided in a switch unit 160. The switch unit 160 is installed, for example, on a wall surface inside a room. Referring again to FIG. 1, it is preferable that the wireless function-equipped lighting fixture 12 and the wireless function-equipped lighting fixture 51 perform two-way wireless communication, but the wireless function-equipped lighting fixture 12 does not have to be able to receive wireless signals, and the wireless function-equipped lighting fixture 51 does not have to be able to transmit wireless signals.

[0023] When the wireless function lighting fixture 12 and the wireless function lighting fixture 51 perform two-way wireless communication, the wireless function lighting fixture 12 can receive, for example, a wireless signal indicating wireless signal reception from the wireless function lighting fixture 51. As a result, the wireless function lighting fixture 12 can recognize that the dimming of the wireless function lighting fixture 51 is being controlled based on the dimming control signal from the dimmer 15. Furthermore, the wireless function lighting fixture 12 can recognize the number of wireless function lighting fixtures 12 that are paired with it.

[0024] Next, a specific example of dimming ratio control of each lighting fixture 11, 12, 51 based on a dimming control signal from dimmer 15 will be described. Fig. 3 is a signal waveform diagram showing an example of a dimming control signal output by dimmer 15 based on a user's dimming operation of dimmer 15, and is a signal waveform diagram showing the relationship between the conduction angle and voltage in the dimming control signal. In the example shown in Fig. 3, a sawtooth-shaped localized voltage waveform 70 appears periodically with respect to the conduction angle, and the voltage waveform 70 appears alternately between regions where the voltage is positive and regions where the voltage is negative.

[0025] The dimming control signal output by dimmer 15 is processed by a control IC (Integrated Circuit) installed in each lighting fixture 11, 12, 51, and dimming ratio control is achieved in each lighting fixture 11, 12, 51. For example, the control IC of each lighting fixture 11, 12, 51 controls the dimming ratio by turning on a switching element (not shown) included in each lighting fixture 11, 12, 51 only in conduction angle ranges b1 and b2 where a sawtooth-shaped localized voltage waveform 70 appears. Alternatively, the control IC of each lighting fixture 11, 12, 51 can control the dimming ratio by turning on a switching element included in each lighting fixture 11, 12, 51 only in conduction angle ranges where the absolute value of the voltage is equal to or greater than a voltage threshold a [V].

[0026] It is preferable that all lighting fixtures 11, 12, 51 that are dimmed by dimmer 15 be equipped with the same control IC, because this allows for easy and highly accurate dimming control to achieve the same dimming rate in all lighting fixtures 11, 12, 51 that are dimmed by dimmer 15. Next, we will explain why it is possible to easily and highly accurately achieve the same dimming rate in all lighting fixtures 11, 12, 51 that are dimmed by dimmer 15 by installing the same control IC in all of those lighting fixtures.

[0027] Figure 4 is a graph showing the dimming ratio of a lighting fixture achieved by two different control ICs for the same dimming control signal phase angle. A achieves 40% of the rated brightness of the corresponding lighting fixture when the phase angle of the dimming control signal from the dimmer is 40°, while a control IC B When the phase angle of the dimming control signal is 40°, only 20% of the rated brightness of the corresponding lighting fixture is achieved.

[0028] Therefore, for example, if you want to achieve 40% of the rated brightness of a lighting fixture when the phase angle of the dimming control signal is 40°, the control IC B In this case, the dimming control signal must be converted and then input, which makes signal processing complicated. In contrast, if all lighting fixtures 11, 12, and 51 dimmed by dimmer 15 are equipped with the same control IC, there is no need to convert the dimming control signal. Therefore, the same dimming rate can be easily and accurately achieved for all lighting fixtures 11, 12, and 51.

[0029] As described above, the lighting system 1 includes a master unit (a lighting fixture 12 with wireless function) that receives a dimming control signal from a dimmer 15 via a wired connection and transmits a wireless signal based on the dimming control signal, and a lighting slave unit (one or more lighting fixtures 51 with wireless function) that is dimmed based on the wireless signal.

[0030] Therefore, by simply placing a master unit in a circuit that includes one or more devices electrically connected to each other via a wired circuit network and one or more devices including dimmer 15, it is possible to perform dimming control of a newly added lighting fixture using dimmer 15 without replacing the existing dimmer 15. Therefore, dimming control can be performed based on the dimming control signal of dimmer 15 even for lighting fixtures that cannot receive a dimming control signal from dimmer 15 via a wired network (one or more lighting fixtures 51 with wireless function), and a unified lighting scene can be freely constructed with a high degree of freedom.

[0031] For example, when a new indirect lighting fixture such as a floor lighting fixture is added, even if the added indirect lighting fixture is connected to a different power system from the master unit, the master unit can control the dimming of the indirect lighting fixture based on the dimming control signal of the dimmer. Therefore, the indirect lighting fixture can achieve the same light-emitting characteristics as the lighting fixtures electrically connected to the wired circuit network including the master unit, creating a lighting scene that is not only unified but also stylish and attractive.

[0032] From the perspective of the lighting slave unit, the spatial brightness of the lighting slave unit can be controlled using an existing dimmer, even if the lighting slave unit is not connected to a dimmer by wire. In other words, the spatial brightness of the lighting slave unit can be controlled regardless of the power supply environment. For this reason, as explained using Figure 2, even if the lighting slave unit is connected by wire to a power source different from the power source to which the dimmer is connected by wire, dimming operation using a dimmer is possible.

[0033] Furthermore, if the parent unit is a lighting fixture (lighting fixture 12 with wireless function), for example, by simply replacing one lighting fixture that is wired to dimmer 15 in an existing (pre-installed) lighting system with a lighting fixture that has wireless transmission function, lighting fixtures that can be dimmed by the existing dimmer 15 can be easily and freely added without replacing the dimmer 15.

[0034] (Second embodiment) Fig. 5 is a configuration diagram of a lighting system 201 according to a second embodiment of the present disclosure. The lighting system 201 includes a master unit A that receives a first dimming control signal from a dimmer A via a wired connection and transmits a first wireless signal based on the first dimming control signal. The lighting system 201 also includes one or more first slave units that are dimmed and controlled based on the first wireless signal, and in the example shown in Fig. 5, the lighting system 201 includes eight first slave units A1 to A8.

[0035] The lighting system 201 also includes a master unit B that receives a second dimming control signal from the dimmer B via a wired connection and transmits a second wireless signal based on the second dimming control signal. The lighting system 201 further includes one or more second slave units that are dimmed and controlled based on the second wireless signal, and in the example shown in Fig. 5, the lighting system 201 includes three second slave units B1 to B3.

[0036] The master unit A and the dimmer A are connected by wire to an AC power source A and are supplied with power from the AC power source A. The master unit B and the dimmer B are connected by wire to an AC power source B that is different from the AC power source A and are supplied with power from the AC power source B. The master unit A, one or more first slave units (slave units A1 to A8), the master unit B, and one or more second slave units (slave units B1 to B3) are each a lighting fixture with a wireless function that has a wireless communication device. The dimmer A constitutes a first dimmer, the master unit A constitutes a first master unit, and the slave units A1 to A8 constitute first lighting slave units. The dimmer B constitutes a second dimmer, the master unit B constitutes a second master unit, and the slave units B1 to B3 constitute second lighting slave units.

[0037] Each of master unit A and master unit B has a selection unit that can independently select one communication channel from a plurality of communication channels. In this embodiment, all of slave units A1 to A8 and B1 to B3 also have a selection unit that can independently select one communication channel from a plurality of communication channels. Lighting system 201 may include one or more lighting slave units that cannot select a communication channel, or may include one or more lighting slave units that can communicate through a fixed communication channel.

[0038] The selection units of the master unit A, the master unit B, and the slave units A1 to A8, B1 to B3 are each configured with, for example, a rotor switch, a dip switch, a slide switch, or a push switch. In the example shown in Fig. 5, the communication channel of the master unit A is set to CH A through selection using the selection unit, and the communication channels of the five slave units A1, A2, A3, A7, and A8 are also set to CH A. On the other hand, the communication channel of the three slave units A4, A5, and A6 is set to CH I, which is different from CH A. In this state, the slave units that can wirelessly communicate with the master unit A are limited to the five slave units A1, A2, A3, A7, and A8, and the master unit A cannot wirelessly communicate with the three slave units A4, A5, and A6.

[0039] In this way, the master unit A and the slave units A1 to A8 can communicate wirelessly by matching the communication channels through an operation using the selection unit, and cannot communicate wirelessly by differentiating the communication channels through an operation using the selection unit. In this way, in the lighting system 201, the master unit A and at least one of the slave units A1 to A8 can be paired and linked without using an information terminal such as a remote control, smartphone, laptop computer, or tablet. This allows the user to easily pair the master unit A with the slave units A1 to A8.

[0040] 5, five slave units A1, A2, A3, A7, and A8 make up a lighting slave unit group of group A, and three slave units A4, A5, and A6 make up a lighting slave unit group of group B. If the communication channel of master unit A is switched from CH A to CH B, the slave units that can communicate wirelessly with master unit A will be the three slave units A4, A5, and A6, and master unit A will no longer be able to communicate wirelessly with the five slave units A1, A2, A3, A7, and A8.

[0041] In this way, parent unit A can transmit wireless signals to the lighting slave units in group A and the lighting slave units in group B, and by switching the communication channel in parent unit A, it is possible to switch the lighting slave units that can receive wireless signals from parent unit A. This increases the degree of freedom in which lighting slave units can be dimmed, making it possible to effectively reduce power consumption, etc.

[0042] When two or more slave devices A1, A2, A3, A7, and A8 are set to the same communication channel as the master device A, all of the two or more slave devices A1, A2, A3, A7, and A8 may directly communicate wirelessly with the master device A. Alternatively, as shown in the example of FIG. 5 , at least one of the slave devices A7 and A8 among the two or more slave devices A1, A2, A3, A7, and A8 set to the same communication channel as the master device A may wirelessly or wiredly acquire information from the other slave device A1 via the other slave device A1 that has wirelessly received information from the master device A. In summary, at least one lighting slave device may receive information based on the dimming control signal of the dimmer via the other lighting slave device.

[0043] AC power source A, dimmer A, main unit A, and one or more first slave units (slave units A1 to A8) are installed in the same room A, and AC power source B, dimmer B, main unit B, and one or more second slave units (slave units B1 to B3) are installed in a room B different from room A. Alternatively, AC power source A, dimmer A, main unit A, and one or more first slave units (slave units A1 to A8) are installed in residence A, and AC power source B, dimmer B, main unit B, and one or more second slave units (slave units B1 to B3) are installed in another residence B.

[0044] The communication channel for the base unit B and one or more second slave units (slave units B1 to B3) is set to CH C, which is different from CH A and different from CH B. As a result, slave units B1 to B3 cannot receive wireless signals from base unit A, and it is possible to prevent slave units B1 to B3 from operating on wireless signals from base unit A installed in a room other than the room where base unit B is installed, thereby preventing wireless signal interference. Alternatively, it is possible to prevent slave units B1 to B3 from operating on wireless signals from base unit A installed in a residence A different from the residence B where base unit B is installed, thereby preventing wireless signal interference.

[0045] (Other variations) The present disclosure is not limited to the above-described embodiment and its modified examples, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents. For example, in the above-described embodiment, a selection unit is used to pair parent devices A and B with child devices A1 to A8 and B1 to B3.

[0046] However, it may also be possible to pair the master unit and the slave unit using an information terminal. Alternatively, referring to FIG. 1 , the master unit and the slave unit may be automatically paired when the time difference between when the power switch 13 of the first circuit 10 including the master unit (wireless communication function lighting fixture 12) is turned on and the time when the power switch 53 of the second circuit 50 including the slave unit (wireless communication function lighting fixture 51) is turned on is equal to or less than a predetermined time. Here, the predetermined time may be set to, for example, shorter than five minutes or shorter than three minutes. This allows for user-friendly pairing.

[0047] Although the case where the dimmer 15 outputs a dimming control signal including phase information has been described, the dimmer may output a dimming control signal that enables PWM (Pulse Width Modulation) control, or a dimming control signal that enables DMX (Digital Multiplex) control, or may output a dimming control signal that enables EcoSystem control.

[0048] Furthermore, in the second embodiment, a case has been described in which the lighting system includes two different master units A and B, but the lighting system may include three or more different master units. Also, a case has been described in which the master unit A is capable of transmitting wireless signals to two different groups of lighting slave units A and B. However, the master unit may be capable of transmitting wireless signals to three or more different groups of lighting slave units, and the group of lighting slave units capable of receiving wireless signals may be switchable by switching the communication channel in the master unit.

[0049] The lighting system of the present disclosure may also have the following configuration. Configuration 1: A lighting system comprising a master unit that receives a dimming control signal from a dimmer via a wired connection and transmits a wireless signal based on the dimming control signal, and one or more slave lighting units that are dimmed based on the wireless signal. Configuration 2: The lighting system according to configuration 1, wherein the parent unit is a lighting fixture. Configuration 3: A lighting system according to configuration 1 or 2, comprising a plurality of the lighting slave units, wherein at least one of the lighting slave units receives information based on the dimming control signal via another of the lighting slave units. Configuration 4: The lighting system according to any one of configurations 1 to 3, wherein the master unit and at least one of the lighting slave units can be linked together without using an information terminal. Configuration 5: A lighting system described in any one of configurations 1 to 4, wherein the parent unit has a selection unit that can select one communication channel from a plurality of communication channels, and the parent unit communicates wirelessly with at least one of the lighting child units using the one communication channel selected from the plurality of communication channels. Configuration 6: A lighting system as described in Configuration 5, wherein the master unit is capable of transmitting the wireless signal to two or more different groups of lighting slave units, and the master unit is capable of switching the group of lighting slave units that can receive the wireless signal by switching the communication channel. [Explanation of symbols]

[0050] 1,201 Lighting system, 5,A,B AC power supply, 10 First circuit, 11 Lighting fixture, 12,112 Wireless function lighting fixture (parent unit), 12a Communication device, 13,53,113 Power switch, 15,115,A,B Dimmer, 50 Second circuit, 51,151 Wireless function lighting fixture (lighting child unit) 70 Voltage waveform, 160 Switch unit, A,B Parent unit, A~A8,B1~B3 Child units, a Voltage threshold, b1,b2 Conduction angle range.

Claims

1. a master unit that receives a dimming control signal from a dimmer via a wired connection and transmits a wireless signal based on the dimming control signal; one or more lighting slave units that are dimmed and controlled based on the wireless signal; A lighting system comprising:

2. The lighting system according to claim 1 , wherein the master unit is a lighting fixture.

3. A plurality of the lighting slave units are provided, The lighting system according to claim 1 or 2, wherein at least one of the lighting slave units receives information based on the dimming control signal via another of the lighting slave units.

4. The lighting system according to claim 1 or 2, wherein the master unit and at least one of the lighting slave units can be linked together without using an information terminal.

5. the master unit has a selection unit that can select one communication channel from a plurality of communication channels, The lighting system according to claim 1 or 2, wherein the master unit wirelessly communicates with at least one of the lighting slave units using one communication channel selected from the plurality of communication channels.

6. the master unit is capable of transmitting the wireless signal to two or more different groups of lighting slave units; The lighting system according to claim 5 , wherein the group of lighting slave units capable of receiving the wireless signal can be switched by switching the communication channel in the master unit.

7. a first master unit that receives a first dimming control signal from a first dimmer via a wire and transmits a first wireless signal based on the first dimming control signal; one or more first lighting slave units that are dimmed and controlled based on the first wireless signal; a second master unit that receives a second dimming control signal from a second dimmer via a wired connection and transmits a second wireless signal based on the second dimming control signal; one or more second lighting slave units that are dimming-controlled based on the second wireless signal, the first base unit has a first selection unit that can select one first communication channel from a plurality of communication channels, and the second base unit has a second selection unit that can select one second communication channel from the plurality of communication channels; the first master unit wirelessly communicates with at least one of the first lighting slave units based on the first communication channel, and the second master unit wirelessly communicates with at least one of the second lighting slave units based on the second communication channel; The lighting system, wherein the first communication channel and the second communication channel are independently selectable from the plurality of communication channels.

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