Illumination system

Abstract

To provide an illumination system that even when a situation is changed, can quickly inhibit a person inside a room from feeling discomfort and, further, can reduce power consumption.SOLUTION: An illumination system 1 comprises an illumination apparatus 4 for emitting illumination light and a tablet 6 for controlling the illumination apparatus 4. The tablet 6 acquires an indoor temperature, which is a temperature of the inside of a room, selects one reference temperature range from a plurality of reference temperature ranges held by the tablet, instructs the illumination apparatus 4 to change a color temperature of the illumination light to a higher value when the indoor temperature is higher than the upper limit value of the selected reference temperature range, and instructs the illumination apparatus 4 to change the color temperature of the illumination light to a lower value when the indoor temperature is lower than the lower limit value of the selected reference temperature range.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a lighting system including a lighting fixture that emits illumination light and a lighting control device that controls the lighting fixture. [Background technology]

[0002] Patent Document 1 discloses a light source control device that changes the color temperature of light emitted by lighting based on the indoor temperature, which is the temperature inside the room, and the indoor humidity, which is the humidity inside the room. Based on the acquired indoor temperature and indoor humidity and a standard of one temperature range and humidity range, the light source control device of Patent Document 1 raises the color temperature of light emitted by lighting or makes it closer to a cool color if the person in the room feels hot, and lowers the color temperature of light emitted by lighting or makes it closer to a warm color if the person in the room feels cold. In this way, the light source control device of Patent Document 1 maintains or improves the comfort of the people in the room. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-230907 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the appropriate indoor temperature and humidity change depending on the time of day, the time of day, the outdoor air temperature, etc. Therefore, if the color temperature of the light emitted by the lighting is changed based only on one temperature and humidity range, it may become too cold or too hot, reducing the comfort of the people in the room.

[0005] In view of the above problems, an object of the present invention is to provide a lighting system that can suppress a decrease in comfort for people in a room even when the date and time change, and further, can reduce power consumption. [Means for solving the problem]

[0006] In order to solve the above problems, the lighting system of the present invention is a lighting system comprising a lighting fixture that emits illumination light and a lighting control device that controls the lighting fixture, wherein the lighting control device acquires an indoor temperature, which is the temperature inside a room, has a plurality of reference temperature ranges, selects one reference temperature range from the plurality of reference temperature ranges, and, if the indoor temperature is higher than an upper limit value of the selected reference temperature range, instructs the lighting fixture to change the color temperature of the illumination light to a higher value, and, if the indoor temperature is lower than a lower limit value of the selected reference temperature range, instructs the lighting fixture to change the color temperature of the illumination light to a lower value. Effect of the Invention

[0007] With the above-mentioned configuration, the lighting system according to the present invention can suppress a decrease in the comfort of people in a room even if the situation changes, and further can reduce power consumption. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a configuration of a lighting system according to an embodiment of the present invention. [Diagram 2] A block diagram showing the configuration of lighting fixtures included in a lighting system. [Diagram 3] Block diagram showing the configuration of the tablet included in the lighting system [Figure 4] FIG. 1 is a diagram for explaining a specific example of monthly light color change reference data [Diagram 5] FIG. 1 is a diagram for explaining light color change reference data; [Figure 6] FIG. 1 is a diagram for explaining a flow of a lighting control process. [Figure 7] FIG. 1 is a diagram for explaining an example of the color temperature of illumination light. [Figure 8] A diagram to explain the influence of the user-set air conditioner operating conditions and the outside temperature [Figure 9] A diagram to explain the transition over time of the color temperature of the illumination light emitted by a lighting fixture (first example) [Figure 10]A diagram to explain the transition over time of the color temperature of the illumination light emitted by a lighting fixture (second example) [Figure 11] FIG. 1 is a diagram for explaining another example of the configuration of a lighting system; [Figure 12] A diagram to explain the color temperature range of cool and warm lighting to obtain a greater Hue-Heat effect. [Figure 13] FIG. 1 is a diagram for explaining warm and cool color temperature settings based on the color temperature of normal illumination light. [Figure 14] A diagram to explain the relationship between the difference between the reference temperature range and the indoor temperature and the color temperature of cool and warm light. [Figure 15] A diagram to explain the reference range for each outside temperature [Figure 16] FIG. 13 is a diagram for explaining a flow of a lighting control process (modification); DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <1. First embodiment> <1.1. Overview> Hereinafter, a lighting system 1 according to an embodiment of the present invention will be specifically described with reference to the drawings.

[0010] The lighting system 1 changes the light color and light temperature of the illumination light emitted by the lighting fixtures when the indoor temperature or indoor humidity falls outside the reference range stored by the lighting system 1. This prevents a decrease in the comfort of people in the room.

[0011] For example, the appropriate indoor temperature and humidity greatly differ between midsummer and midwinter. For this reason, the lighting system 1 has a number of reference ranges that take into consideration conditions such as the date and time of day. The reference ranges include a reference temperature range, which is the range of indoor temperature, and a reference humidity range, which is the range of indoor humidity.

[0012] The standard temperature range is a temperature range in which the comfort of people in the room is unlikely to decrease. The standard humidity range is a humidity range in which the comfort of people in the room is unlikely to decrease. If the indoor temperature falls outside the standard temperature range or the indoor humidity falls outside the standard humidity range, the comfort of people in the room may decrease.

[0013] Therefore, when the indoor temperature falls outside the standard temperature range or the indoor humidity falls outside the standard humidity range, the lighting system 1 prevents a decrease in the comfort of people in the room by changing the lighting using the Hue-Heat effect.

[0014] The Hue-Heat effect is an effect in which the hue that is perceived by the human eye affects the human sense of warmth and coldness (heat). For example, when the lighting illuminating the interior of a room is changed from white light to daylight light, which is cooler than white, the people in the room will feel a sense of coolness. Here, white light is, for example, light with a color temperature of 4200 [K], and daylight light is, for example, light with a color temperature of 5500 [K].

[0015] For example, if the illumination light illuminating the interior of a room is changed from white light to incandescent light, which is warmer than white, people in the room will feel a sense of warmth. Here, incandescent light is light with a color temperature of 3000[K], for example.

[0016] When the color temperature of the lighting illuminating the interior of a room is changed to a higher temperature, people in the room feel a cool sensation. On the other hand, when the color temperature of the lighting illuminating the interior of a room is changed to a lower temperature, people in the room feel a warm sensation.

[0017] As a result, when the indoor temperature falls outside the standard temperature range or the indoor humidity falls outside the standard humidity range, the lighting system 1 can change the color temperature of the illumination light to prevent a decrease in the comfort of people in the room and also reduce power consumption.

[0018] In the following description, the same parts that are included in common in the drawings to which reference is made are given the same reference numerals, and, as a general rule, duplicated descriptions of the same parts are omitted.

[0019] 1 shows the configuration of a lighting system 1 according to an embodiment of the present invention. The lighting system 1 is a system that illuminates the inside of a room 10 provided in, for example, an office building. The lighting system 1 controls lighting fixtures that illuminate the inside of the room 10 based on an indoor temperature that is the temperature inside the room 10 and an indoor humidity that is the humidity inside the room 10.

[0020] The lighting system 1 includes a lighting fixture 4, a tablet 6 as an example of a lighting control device, an air conditioner 7, and an indoor sensor 5 that acquires information on indoor temperature and indoor humidity.

[0021] The tablet 6, the lighting fixture 4, and the indoor sensor 5 communicate wirelessly with each other. The dotted arrows in Fig. 1 show the wireless communication in a schematic manner. The wireless communication is based on, for example, the Bluetooth (registered trademark) Low Energy specification or the Bluetooth (registered trademark) mesh specification.

[0022] The tablet 6 acquires information on the indoor temperature and humidity from the indoor sensor 5. The tablet 6 controls the lighting fixtures 4 based on the acquired indoor temperature and humidity information and information on the reference temperature range and reference humidity range stored in the tablet 6. The tablet 6 stores the reference temperature range and reference humidity range for each month. In addition, the tablet 6 uses the reference temperature range and reference humidity range corresponding to the current month.

[0023] The tablet 6 changes the light color or color temperature of the light emitted by the lighting fixture 4 if the indoor temperature is not within a standard temperature range corresponding to the current month and / or if the indoor humidity is not within a standard humidity range corresponding to the current month.

[0024] As a result, the lighting system 1 can suppress a decrease in the comfort of people in the room 10 even when the indoor temperature falls outside the standard temperature range and / or the indoor humidity falls outside the standard humidity range.

[0025] Each component of the lighting system 1 will now be described in detail.

[0026] <1.2. Configuration> <1.2.1. Lighting equipment 4> 2 shows the configuration of the lighting fixture 4. The lighting fixture 4 emits illumination light to illuminate the surroundings of the location where the lighting fixture 4 is installed. The lighting fixture 4 includes a light source unit 41, a circuit unit 43, and a wireless module (hereinafter referred to as "WM") unit 45.

[0027] The light source unit 41 emits illumination light. The light source unit 41 includes a light source and a light source board, which is a circuit board on which the light source is arranged. The light source is, for example, composed of an LED (Light Emitting Diode). It is sufficient for the light source to function as a light source for illumination, and the light source may be composed of a device other than an LED, such as an organic EL (Electro Luminescence) device or a laser device. Based on an input control signal, the light source unit 41 turns the light source on and off, adjusts the light color or light temperature of the illumination light emitted by the light source, changes the dimming rate, and so on.

[0028] The circuit section 43 includes a socket for mounting the WM section 45. The circuit section 43 supplies a current to the light source section 41 in response to a signal received from the WM section 45.

[0029] The WM unit 45 is an independent device that performs wireless communication, and is detachable from a socket that mounts the WM unit 45. The WM unit 45 is capable of wireless communication according to a plurality of communication specifications, but is not limited thereto. For example, a dedicated WM unit 45 may be prepared for each different communication specification, and the WM unit 45 corresponding to the communication protocol to be used may be mounted in the socket.

[0030] The WM unit 45 includes a wireless communication unit 45a, a control unit 45b, and a storage unit 45c.

[0031] The wireless communication unit 45a transmits and receives information by wireless communication. When the wireless communication unit 45a receives communication data or a control signal, the wireless communication unit 45a notifies the control unit 45b if the communication data is addressed to the device itself. When the wireless communication unit 45a receives communication data addressed to another device, the wireless communication unit 45a may transfer the communication data to the other device via a mesh network or the like.

[0032] Control unit 45b includes a calculation element such as an integrated circuit (IC) or a central processing unit (CPU), and controls the operation of lighting device 4. When control unit 45b receives an operation instruction related to the operation of the light source, such as turning on, turning off, or blinking the light source, changing the color temperature, increasing the dimming rate, or decreasing the dimming rate, control unit 45b outputs a signal for performing the operation indicated by the operation instruction to light source unit 41 via circuit unit 43.

[0033] The storage unit 45c stores programs, data, etc. for operating the control unit 45b, and provides the stored programs, data, etc. to the control unit 45b. The storage unit 45c includes a non-volatile storage medium such as a flash memory to which the programs, data, etc. to be stored can be added and changed, and a volatile storage medium such as a RAM (Random Access Memory).

[0034] The flash memory or the like included in the storage unit 45c stores programs, data, and the like for operating the control unit 45b. The RAM or the like included in the storage unit 45c is used as a working area for the control unit 45b when the control unit 45b executes a program.

[0035] <1.2.2. Air Conditioner 7> Referring again to FIG. 1, the air conditioner 7 is an example of an air conditioning facility or an air conditioner, and adjusts the temperature and humidity of the air inside the room 10. In this embodiment, the air conditioner 7 operates according to operating conditions instructed by the user. The operating conditions include an operating mode, such as cooling, heating, or stopped, and a target temperature. When the operating mode is cooling or heating, the air conditioner 7 operates in the instructed operating mode so that the indoor temperature becomes the instructed target temperature. In this embodiment, the operating conditions of the air conditioner 7 are set in advance.

[0036] <1.2.3. Indoor sensor 5> The indoor sensor 5 acquires information on the indoor temperature and the indoor humidity. The indoor sensor 5 transmits the acquired information on the indoor temperature and the indoor humidity to the tablet 6.

[0037] <1.2.4.Tablet 6> 1, the tablet 6 is a portable information terminal device having a rectangular plate-like appearance and a touch panel 64 embedded on one surface. The tablet 6 has a function of displaying a user interface (hereinafter referred to as "UI") on the touch panel 64.

[0038] Tablet 6 determines an instruction for an operation requested by the user based on the contents of the UI displayed on touch panel 64 and the contents of the user input, and transmits a control request based on the user input to lighting fixtures 4, etc. The user input is, for example, a touch operation or a gesture input on touch panel 64 performed by the user.

[0039] 3 shows the configuration of the tablet 6. The tablet 6 includes a control unit 61, a storage unit 62, a wireless communication unit 63, and a touch panel 64.

[0040] The storage unit 62 holds various data in addition to applications, programs, and UIs. The storage unit 62 is used as a work area by the control unit 61. The storage unit 62 includes a non-volatile storage medium such as a flash memory that allows data to be added and changed, and a volatile storage medium such as a RAM.

[0041] The flash memory etc. included in the storage unit 62 stores programs etc. for operating the control unit 61 and images constituting the UI displayed on the touch panel 64. The RAM etc. included in the storage unit 62 is used as a working area for the control unit 61 when the control unit 61 executes a program.

[0042] The touch panel 64 is an electronic component that combines a display unit that displays images and information constituting the UI with an input unit that accepts user instructions, and functions as a user interface means. The display unit is, for example, a liquid crystal panel. The input unit is, for example, a touch pad. The touch panel 64 notifies the control unit 61 of the contents input by the user.

[0043] The control unit 61 includes a computing element such as an IC or a CPU. The control unit 61 executes a program stored in a flash memory or the like included in the storage unit 62 to realize each function of the tablet 6. The control unit 61 identifies the content of an instruction from the user based on the UI displayed on the touch panel 64 and the user input notified from the touch panel 64, and executes processing according to the instruction from the user.

[0044] The wireless communication unit 63 is configured with a device that performs wireless communication. The wireless communication unit 63 performs wireless communication with the lighting fixtures 4 and the indoor sensor 5.

[0045] <1.3.Data> <1.3.1. Light color change reference data> Fig. 4 is a diagram showing light color change reference data, and Fig. 5 is a schematic diagram for explaining lighting control executed based on the light color change reference data.

[0046] The light color change reference data has reference range data for each month. The reference range data has an upper limit value TH [℃] and a lower limit value TL [℃] of the reference temperature range, an upper limit value HH [%] of the reference humidity range, and a lower limit value HL [%] of the reference humidity range. For example, the reference range data for January has an upper limit value TH of 22 [℃], a lower limit value TL of 18 [℃], an upper limit value HH of 65 [%], and a lower limit value HL of 55 [%]. The reference range data for January corresponds to the range 501A in FIG. 5. Similarly, the reference range data for February to December corresponds to the ranges 501B to 501L not shown in FIG. 5.

[0047] 5, the horizontal axis represents indoor temperature, the vertical axis represents indoor humidity, and the depth direction represents months. In FIG 5, range 500A corresponds to January, range 500B corresponds to February, and similarly, ranges 500C to 500L correspond to March to December, respectively.

[0048] Range 501A shows the reference range represented by the reference range data for January. The reference range is a range in which the indoor temperature is within the reference temperature range and the indoor humidity is within the reference humidity range. If the indoor temperature and indoor humidity are within the reference ranges, the illumination light color is not changed. Specifically, range 501A is a range in which the indoor temperature is equal to or greater than the lower limit TL and equal to or less than the upper limit TH, and the indoor humidity is equal to or greater than the lower limit HL and equal to or less than the upper limit HH.

[0049] Range 503A indicates the range of indoor temperature and humidity in January where people inside tend to feel hot, and within this range, the illumination light color is changed from the normal light color to a cooler color. Specifically, range 503A is the range where the indoor temperature exceeds the upper limit value TH, and the range where the indoor temperature is equal to or greater than the lower limit value TL and equal to or less than the upper limit value TH and the indoor humidity exceeds the upper limit value HH.

[0050] Range 505A is the range of indoor temperature and humidity in January at which people in the room tend to feel cold, and within this range, the illumination light color is changed from the normal light color to a warmer color. Specifically, range 505A is the range where the indoor temperature is below a lower limit value TL, and the range where the indoor temperature is equal to or greater than the lower limit value TL and equal to or less than the upper limit value TH, and the indoor humidity is below a lower limit value HL.

[0051] For 500B to 500L relating to February to December, the lighting control is performed in the same manner as in the case of January described above.

[0052] The storage unit 62 of the tablet 6 stores light color change reference data as shown in FIG.

[0053] <1.3.2. Operating conditions of air conditioner 7> In this embodiment, the user decides the operation mode of the air conditioner 7 based on the monthly average outdoor temperature. Specifically, the user sets the operation mode of the air conditioner 7 to cooling when the monthly average outdoor temperature is above 28°C, and sets the operation mode of the air conditioner 7 to heating when the monthly average outdoor temperature is below 18°C. Furthermore, when the operation mode of the air conditioner 7 is cooling, the user sets the target temperature higher than the upper limit of the reference temperature range in order to save energy and reduce electricity costs, and when the operation mode of the air conditioner 7 is heating, the user sets the target temperature lower than the lower limit of the reference temperature range.

[0054] For example, if the average outside temperature in August is 29.5°C, the operating conditions of the air conditioner 7 in August are cooling operation and a target temperature of 29°C, which is 1°C higher than the upper limit value TH of the reference temperature range, 28°C.

[0055] <1.4. Operation> The lighting system 1 executes lighting control processing based on a user operation input to the tablet 6. The user operation input to the tablet 6 is, for example, an instruction to start the lighting control processing or an instruction to end the lighting control processing. A specific flow of the lighting control processing will be described below.

[0056] <1.4.1. Lighting control processing> <1.4.1.1. Lighting control process flow> The lighting control process is a process for changing the light color or color temperature of the illumination light emitted by the lighting device 4 based on the indoor temperature and indoor humidity. Fig. 6 is a diagram for explaining the flow of the lighting control process. Fig. 7 is a diagram for explaining an example of the color temperature of the illumination light when the lighting device 4 emits a predetermined warm or cool light.

[0057] The lighting control process is started when a user inputs an instruction to start the lighting control process into a UI displayed on the touch panel 64 of the tablet 6. After the user gives an instruction to start the lighting control process, the lighting control process is periodically repeated. Periodically means, for example, once every 10 minutes. The lighting control process is ended by a user instruction.

[0058] A user may issue an instruction to start the lighting control process, for example, on a weekday morning, by an office building manager. The lighting fixtures 4 in room 10 are turned on at the latest when the instruction to start the lighting control process is issued. The illumination light emitted by the lighting fixtures 4 when the instruction to start the lighting control process is issued is normal illumination light in this embodiment, and is white light with a color temperature of 4200K (FIG. 7).

[0059] When the lighting control process starts, the tablet 6 acquires the lower limit TL and upper limit TH of the reference temperature range and the lower limit HL and upper limit TH of the reference humidity range for the current month (step S101). In step S101, the tablet 6 acquires the current month, for example, directly or indirectly from an Internet time server. If the current month is August, the tablet 6 reads from the storage unit 62 the lower limit TL of the reference temperature range for the current month, which is 25[°C], the upper limit TH of the reference humidity range, which is 28[°C], the lower limit HL of the reference humidity range, which is 45[%], and the upper limit HH of the reference humidity range, which is 60[%].

[0060] After step S101, the tablet 6 acquires the indoor temperature and indoor humidity from the indoor sensor 5 (step S103).

[0061] After step S103, the tablet 6 determines whether the indoor temperature is equal to or higher than the lower limit TL of the reference temperature range and equal to or lower than the lower limit TL (step S105).

[0062] If the room temperature is not equal to or higher than the lower limit TL or equal to or lower than the upper limit TH of the reference temperature range in step S105 (NO in step S105), the tablet 6 determines whether the room temperature is lower than the lower limit TL of the reference temperature range (step S111).

[0063] If the indoor temperature is higher than the lower limit TL of the reference temperature range in step S111 (NO in step S111), the process proceeds to step S117.

[0064] In step S117, tablet 6 instructs lighting device 4 to make the illumination color cooler. When lighting device 4 receives the instruction from tablet 6 to make the illumination color cooler, lighting device 4 changes the illumination color from the normal light color to a predetermined cool color. In this embodiment, the predetermined cool color illumination is daylight light with a color temperature of 5500 [K]. When the change in the illumination color temperature is completed in step S117, the process proceeds to step S109.

[0065] If the indoor temperature is lower than the lower limit TL of the reference temperature range in step S111 (YES in step S111), the process proceeds to step S115.

[0066] In step S115, tablet 6 instructs lighting device 4 to make the illumination color warmer. When lighting device 4 receives the instruction from tablet 6 to make the illumination color warmer, it changes the illumination color from the normal light color to a predetermined warm color. In this embodiment, the predetermined warm color illumination light is an incandescent light with a color temperature of 3000 [K]. When the change in the illumination color temperature is completed in step S115, the process proceeds to step S109.

[0067] If the indoor temperature is equal to or higher than the lower limit TL and equal to or lower than the upper limit TH of the reference temperature range in step S105 (YES in step S105), the tablet 6 determines whether the indoor humidity is equal to or higher than the lower limit HL and equal to or lower than the upper limit HH of the reference humidity range (step S107).

[0068] If the indoor humidity is not equal to or higher than the lower limit HL and not equal to or lower than the upper limit HH of the standard humidity range in step S107 (NO in step S107), the tablet 6 determines whether the indoor humidity is lower than the lower limit HL of the standard humidity range (step S113).

[0069] If the indoor humidity is lower than the lower limit HL of the standard humidity range in step S113 (YES in step S113), the process proceeds to the above-mentioned step S115. On the other hand, if the indoor humidity is higher than the lower limit HL of the standard humidity range in step S113 (NO in step S113), the process proceeds to the above-mentioned step S117.

[0070] If it is determined in step S107 that the indoor humidity is equal to or higher than the lower limit HL and equal to or lower than the upper limit HH of the standard humidity range, the process proceeds to step S109.

[0071] In step S109, the tablet 6 judges whether an end instruction has been received from the user. If an end instruction has been received from the user in step S109 (YES in step S109), the tablet 6 ends the lighting control process. The end instruction is given, for example, on a weekday evening when the last user leaves the room 10 provided in an office building. If an end instruction has not been received from the user in step S109 (NO in step S109), the tablet 6 proceeds to step S103 and repeats the above-mentioned process.

[0072] <1.4.1.2. Specific examples> A specific example of changing the color temperature of illumination light in the illumination control process will be described with reference to Fig. 4 to Fig. 8. Fig. 8 is a diagram for explaining the operating conditions of the air conditioner 7 set by the user and the influence of the outside air temperature.

[0073] (1) If the current month is August It is assumed that the current month is August and the reference temperature range etc. for August are as shown in Figures 4 and 8. The tablet 6 acquires the reference temperature range and the reference temperature range for August (step S101).

[0074] In August, the operating condition of the air conditioner 7 is cooling, the target temperature is 29°C, the upper limit of the reference temperature range is 28°C, and the average outside temperature is 29.5°C (FIGS. 4 and 8). Therefore, after a certain amount of time has passed, the indoor temperature exceeds the upper limit TH of the reference temperature range due to the influence of heat entering the room 10 through a window or the like installed in the room 10 (NO in step S105, NO in S111). When the indoor temperature exceeds the upper limit TH of the reference temperature range, the tablet 6 instructs the lighting device 4 to make the illumination color cooler (step S117). When the lighting device 4 is instructed by the tablet 6 to make the illumination color cooler, the lighting device 4 changes the color temperature of the illumination from 4200[K] to 5500[K] (FIG. 7).

[0075] This change in the color temperature of the illumination light makes people inside the room 10 feel cool. Therefore, changing the color temperature of the illumination light can prevent the comfort of people in the room from decreasing due to an increase in the indoor temperature. In addition, the operating conditions of the air conditioner 7 are cooling, with a target temperature of 29°C. Therefore, the power consumption of the air conditioner 7 can be reduced compared to when the operating conditions of the air conditioner 7 are cooling, with a target temperature of 28°C or lower.

[0076] (2) If the current month is January It is assumed that the current month is January and the reference temperature ranges etc. for January are as shown in Figures 4 and 8. The tablet 6 acquires the reference temperature range and reference humidity range for January (step S101).

[0077] In January, the operating conditions of air conditioner 7 are heating, the target temperature is 17°C, the lower limit TL of the reference temperature range is 18°C, and the average outside temperature is 5.6°C (FIGS. 4 and 8). As a result, after a certain amount of time has passed, the indoor temperature falls below the lower limit TL of the reference temperature range due to the influence of heat escaping from a window or the like in room 10 (NO in step S105, YES in S111). When the indoor temperature falls below the lower limit TL of the reference temperature range, tablet 6 instructs lighting fixture 4 to make the illumination color warmer (step S115). When instructed by tablet 6 to make the illumination color warmer, lighting fixture 4 changes the color temperature of the illumination from 4200K to 3000K (FIG. 7).

[0078] This change in the color temperature of the illumination light makes people inside the room 10 feel a sense of warmth. Therefore, changing the color temperature of the illumination light can prevent a decrease in the indoor temperature from decreasing the comfort of the people inside the room. In addition, the operating conditions of the air conditioner 7 are heating and the target temperature is 17°C. Therefore, the power consumption of the air conditioner 7 can be reduced compared to when the operating conditions of the air conditioner 7 are heating and the target temperature is 18°C ​​or higher.

[0079] (3) If the current month is May Assume that the current month is May and the reference temperature range etc. for May are as shown in Figures 4 and 8. The tablet 6 acquires May as the current month, and acquires the reference temperature range and reference humidity range for May (step S101).

[0080] The upper limit TH of the reference temperature range in May is 22°C, the lower limit TL is 18°C, and the average outside temperature is 20°C (FIGS. 4 and 8). The air conditioner is also turned off in May. If the indoor temperature is outside the reference temperature range or if the indoor humidity is outside the reference humidity range, tablet 6 instructs lighting fixture 4 to change the color temperature of the illumination light (step S115 or S117).

[0081] When the air conditioner 7 is not operated, power consumption can be reduced compared to when the air conditioner 7 is operated. Furthermore, when the indoor temperature is outside the standard temperature range or when the indoor humidity is outside the standard humidity range, the tablet 6 instructs the lighting fixtures 4 to change the color temperature of the illumination light. Therefore, by changing the color temperature of the illumination light, it is possible to prevent a decrease in the comfort of people in the room due to an increase in the indoor temperature.

[0082] <1.5.Effects> As described above, the lighting system 1 according to this embodiment has a reference temperature range and a reference humidity range for each month. Furthermore, when the indoor temperature falls outside the reference temperature range or the indoor humidity falls outside the reference humidity range, the lighting system 1 according to this embodiment changes the illumination light emitted by the lighting fixtures 4 to a cooler or warmer color. The hue-heat effect caused by this change in illumination light can prevent people in the room from feeling uncomfortable.

[0083] Furthermore, in this embodiment, the target temperature of the air conditioner 7 is set outside the reference temperature range, which allows the power consumption of the air conditioner 7 to be reduced.

[0084] Therefore, the lighting system 1 according to this embodiment can reduce the amount of power consumed in the room 10 while preventing people in the room from feeling uncomfortable, even as the month changes.

[0085] <2. Second embodiment> <2.1. Overview> In the first embodiment, an example was described in which the Hue-Heat effect caused by changing the light color and color temperature of the illumination light suppresses the deterioration of comfort for people in the room. Here, it is considered that the Hue-Heat effect weakens after a certain amount of time has passed. Therefore, in this embodiment, at a time when the Hue-Heat effect is considered to weaken, the light color and color temperature of the illumination light are changed again to maintain the effectiveness of the Hue-Heat effect.

[0086] <2.2 Transition of color temperature of lighting> <2.2.1 Transition between pre-change color temperature CT1 and post-change color temperature CT2> A specific example of this embodiment will be described with reference to Fig. 9. Fig. 9 is a diagram (first example) for explaining the transition over time of the color temperature of the illumination light emitted by the lighting device 4. When the tablet 6 changes the color of the illumination light to a cooler color, for example, the color temperature of the illumination light is changed as shown in Fig. 9.

[0087] Specifically, the color temperature of the illumination light emitted by the lighting device 4 at a time prior to time t11 is assumed to be a pre-change color temperature CT1. The pre-change color temperature CT1 is the color temperature of the illumination light before an instruction is given to change the color temperature of the illumination light to a higher or lower value. The pre-change color temperature CT1 is, for example, 4200 [K], which is a normal color temperature.

[0088] Next, tablet 6 changes the color temperature of the illumination light emitted by lighting device 4 from pre-change color temperature CT1 to post-change color temperature CT2 from time t11 to time t12, 10 seconds after time t11. Post-change color temperature CT2 is the color temperature after the change when instructing to change the color temperature of the illumination light higher or lower than the pre-change color temperature. Post-change color temperature CT2 is, for example, 5500 [K].

[0089] Next, from time t12 to time t13, which is 10 seconds after time t12, tablet 6 maintains the color temperature of the illumination light emitted by lighting device 4. Next, from time t13 to time t14, which is one hour after time t13, tablet 6 changes the color temperature of the illumination light emitted by lighting device 4 from post-change color temperature CT2 to pre-change color temperature CT1.

[0090] After time t14, the tablet 6 changes the color temperature of the illumination light again at or shortly before the time when the Hue-Heat effect is considered to weaken. For example, after time t21, the tablet 6 increases and decreases the color temperature of the illumination light at the same timing as t11 to t14. The time interval between times t21, t22, and t23 shown in FIG. 9 is the same as the time interval between times t11, t12, and t13.

[0091] In this embodiment, the color temperature of the illumination light is changed from the pre-change color temperature CT1 to the post-change color temperature CT2, and then returned to the pre-change color temperature CT1. Then, at a time when the Hue-Heat effect is considered to be weakened or shortly before that time, the color temperature of the illumination light is changed from the pre-change color temperature CT1 to the post-change color temperature CT2. Therefore, in this embodiment, the effectiveness of the Hue-Heat effect can be maintained.

[0092] In this embodiment, when the illumination light is changed from the normal color temperature of 4200 [K] to the cool color of 5500 [K], the change is made in a short period of 10 seconds. Therefore, people inside the room 10 feel a sense of coolness due to the change in color temperature of the illumination light. On the other hand, when the illumination light is changed from the cool color of 5500 [K] to the normal color temperature of 4200 [K], it takes a long time of 1 hour to return to the normal color temperature. In this case, people inside the room 10 are less likely to feel a sense of warmth due to the change in color temperature of the illumination light.

[0093] That is, by changing the color temperature of the illumination light in this way, it is possible to give only a cool feeling to people inside the room 10. Also, since the illumination light is returned to its normal color temperature, by changing the color temperature of the illumination light back to a cool color, it is possible to give a cool feeling to people inside the room 10 and maintain the effectiveness of the Hue-Heat effect.

[0094] Therefore, the lighting system 1 according to the present embodiment can maintain the Hue-Heat effect even if the Hue-Heat effect weakens over time. In other words, it is possible to repeatedly reduce the amount of power consumed in the room 10 while suppressing discomfort felt by people in the room.

[0095] In this embodiment, an example of changing the illumination light from a normal color temperature to a cool color has been described, but the illumination light may be changed from a normal color temperature to a warm color. When changing the illumination light from a normal color temperature to a warm color, for example, the pre-change color temperature CT1 is 4200 [K] and the post-change color temperature CT2 is 3000 [K].

[0096] <2.2.2 Transition between color temperatures other than CT1 before and CT2 after the change> In this embodiment, the color temperature of the illumination light may be changed from a pre-change color temperature CT1 to a post-change color temperature CT2, and then returned to a color temperature CT3 different from the pre-change color temperature CT1. This case will be described with reference to Fig. 10. Fig. 10 is a diagram (second example) for explaining the transition over time of the color temperature of the illumination light emitted by lighting device 4.

[0097] The change over time in the color temperature of the illumination light from time t11 to time t13 in Fig. 10 is the same as in Fig. 9. However, in Fig. 10, the color temperature of the illumination light is changed from the post-change color temperature CT2 to the color temperature CT3 from time t13 to time t15. The color temperature CT3 is higher than the pre-change color temperature CT1 and lower than the post-change color temperature CT2, and is, for example, 4500 [K].

[0098] If the amount of change in color temperature per unit time from time t13 to time t14 in Fig. 9 is the same as the amount of change in color temperature per unit time from time t13 to time t15 in Fig. 10, the time interval from time t13 to time t15 is shorter than the time interval from time t13 to time t14. Therefore, time t15 is earlier than time t14.

[0099] In addition, time t15 is earlier than time t14, and if the time interval from time t14 to time t21 is the same as the time interval from time t15 to time t41, time t41 is earlier than time t21. Therefore, the cooling sensation caused by the Hue-Heat effect can be given to people inside the room 10 in a shorter time interval.

[0100] Therefore, even in cases where the Hue-Heat effect is thought to weaken in a shorter time, the effectiveness of the Hue-Heat effect can be maintained.

[0101] <3. Third embodiment> <3.1. Overview> In the lighting system 1 in the above embodiment, the change in color temperature of the illumination light based on the indoor temperature and indoor humidity and the reference range has been described. However, the present invention is not limited to this. The lighting system 1a according to this embodiment controls the light color and color temperature of the illumination light that illuminates the inside of a room based on the outdoor air temperature. In this way, the lighting system 1a suppresses the discomfort felt by people who enter the room from outside the building.

[0102] FIG. 11 is a diagram for explaining the configuration of a lighting system 1a according to this embodiment. In this embodiment, a building is provided with rooms 10a and 10b. In lighting control of room 10b, a detection result that a person has entered room 10b from outside the building and an outdoor air temperature are used instead of the indoor temperature in the first embodiment. In lighting control of room 10b, when the outdoor air temperature is higher than the upper limit of the reference temperature range by a predetermined value or more, or when the outdoor air temperature is lower than the lower limit of the reference temperature range by a predetermined value or more, the color temperature of the illumination light emitted by the lighting fixture is changed.

[0103] The lighting control in the room 10a is the same as the lighting control process in the first embodiment.

[0104] <3.2. Configuration> A lighting fixture 4a, a tablet 6, an air conditioner 7a, and an indoor sensor 5a are arranged in room 10a. A lighting fixture 4b, an air conditioner 7b, and an indoor sensor 5b are arranged in room 10b. In addition, an outdoor sensor 9b is arranged outside the building. The lighting fixtures 4a and 4b have the same configuration as the lighting fixture 4 in the first embodiment. The air conditioners 7a and 7b have the same configuration as the air conditioner 7 in the first embodiment.

[0105] The indoor sensor 5a has the same configuration as the indoor sensor 5 in the first embodiment. The indoor sensor 5b has a configuration for functioning as a human body detection sensor in addition to the configuration of the indoor sensor 5 in the first embodiment. When the indoor sensor 5b detects that the room 10b has changed from a state where no one is present to a state where someone is present, it notifies the tablet 6 that a person has entered the room 10b.

[0106] The outdoor sensor 9b acquires the outdoor air temperature. The outdoor sensor 9b wirelessly communicates with the tablet 6. The outdoor sensor 9b notifies the tablet 6 of the acquired information on the outdoor air temperature.

[0107] <3.3. Lighting control in room 10b> The room 10b is, for example, an elevator or a room near the entrance of a building. A person entering the room 10a from outside the building passes through the interior of the room 10b and then enters the room 10a. In this case, the surface temperature of the body of the person who entered the room 10b from outside the building remains close to the outside air temperature for a certain period of time.

[0108] When the outdoor air temperature is higher than the upper limit TH of the reference temperature range by a certain value or lower than the lower limit TL of the reference temperature range by a certain value or more, people outside the building are likely to feel uncomfortable due to the heat or cold. In these situations, the body surface temperature of people who enter the room 10b from outside the building will remain close to the outdoor air temperature for a certain period of time. For this reason, these people will continue to feel uncomfortable for a certain period of time.

[0109] For example, assume that the outdoor air temperature during the hottest hours of summer is higher than the upper limit TH of the reference temperature range by a certain value or more. In this case, when a person returning to room 10a from outside the building enters room 10b, the surface temperature of the person's body remains higher than the upper limit TH of the reference temperature range for a certain period of time after entering room 10b.

[0110] Therefore, when the outdoor temperature detected by the outdoor sensor 9b is higher than the upper limit TH of the reference temperature range by a predetermined value or more, and the indoor sensor 5b detects that a person has entered the room 10b from outside the building, the tablet 6 changes the color of the illumination light emitted by the lighting fixture 4b arranged in the room 10b to a cooler color. The predetermined value is, for example, 2°C.

[0111] The color temperature of the cooler illumination in room 10b is higher than the color temperature of the cooler illumination in room 10a. For example, if the color temperature of the cooler illumination in room 10a is 5500[K], the color temperature of the cooler illumination in room 10b is 6500[K].

[0112] In addition, for example, assume that the outdoor air temperature during a cold time period in winter is lower than the lower limit TL of the reference temperature range by a certain value or more. In this case, when a person returning to room 10a from outside the building enters room 10b, the surface temperature of the person's body remains lower than the lower limit TL of the reference temperature range for a certain period of time after entering room 10b.

[0113] Therefore, when the outdoor temperature detected by the outdoor sensor 9b is lower than the lower limit TL of the reference temperature range by a predetermined value or more, and the indoor sensor 5b detects that a person has entered the room 10b from outside the building, the tablet 6 makes the color of the illumination light emitted by the lighting fixture 4b arranged in the room 10b warmer. The predetermined value is, for example, 2[℃].

[0114] The color temperature of the warmer illumination light in room 10b is lower than the color temperature of the warmer illumination light in room 10a. For example, if the color temperature of the warmer illumination light in room 10a is 3000[K], the color temperature of the warmer illumination light in room 10b is 2000[K].

[0115] As a result, in this embodiment, it is possible to quickly prevent a person who enters the room 10b from outside the building from continuing to feel uncomfortable.

[0116] In addition, in this embodiment, the light color control of the illumination light in the room 10b is independent from the light color control of the illumination light in the room 10a. Therefore, the light color control of the illumination light in the room 10a is not performed in conjunction with the light color control of the illumination light in the room 10b. Therefore, in this embodiment, when the person in the room 10a feels comfortable, the light color of the illumination light in the room 10a is changed for the person who enters the room 10b, so that the person in the room 10a can be prevented from feeling uncomfortable.

[0117] Therefore, in this embodiment, it is possible to quickly prevent people who enter some rooms from continuing to feel uncomfortable, while preventing people who are feeling comfortable in other rooms from becoming uncomfortable.

[0118] <4. Fourth embodiment> <4.1. Overview> In the above embodiment, the reference range is constant for each month, and the color temperature of the normal illumination light, the color temperature of the predetermined warm color illumination light, and the color temperature of the predetermined cool color illumination light are constant. However, the present invention is not limited to this.

[0119] In this embodiment, the reference range and the color temperature of normal illumination, cool illumination, or warm illumination are changed based on the user's preference, the user's physical condition, and the like.

[0120] <4.2. Changing the reference temperature range based on the user's physical condition, etc.> For example, when the user inputs into the tablet 6 that he / she has a cold, the tablet 6 shifts the reference temperature range to the higher temperature side. Specifically, when the user inputs into the tablet 6 that he / she has a cold, the tablet 6 raises the upper limit TH and the lower limit TL of the reference temperature range by 2°C, respectively.

[0121] Furthermore, for example, when the user presses a "warm" button displayed on the tablet 6, the tablet 6 shifts the reference temperature range to the higher temperature side. Specifically, when the "warm" button displayed on the tablet 6 is pressed, the tablet 6 raises the upper limit TH and the lower limit TL of the reference temperature range by 1°C, respectively.

[0122] Furthermore, for example, when the user presses a "cool" button displayed on the tablet 6, the tablet 6 shifts the reference temperature range to the lower temperature side. Specifically, when the "cool" button displayed on the tablet 6 is pressed, the tablet 6 lowers the upper limit TH and the lower limit TL of the reference temperature range by 1°C, respectively.

[0123] In this embodiment, the appropriate temperature range is changed based on the user's physical condition, the user's preferences, etc. Therefore, in this embodiment, it is possible to more effectively prevent people in the room from feeling uncomfortable.

[0124] <4.3. Changing the color temperature of lighting> The change in the color temperature of the illumination light will be specifically described with reference to Fig. 12 and Fig. 13. Fig. 12 is a diagram for explaining the color temperature range of the illumination light in cool and warm colors to obtain a greater Hue-Heat effect. Fig. 13 is a diagram for explaining the setting of the color temperature of the illumination light in warm and cool colors based on the color temperature of the illumination light in normal times.

[0125] It is said that the greater the change in the color temperature of the illumination light, the greater the sense of coolness or warmth obtained by the Hue-Heat effect. Therefore, as shown in Fig. 12, the color temperature of the illumination light when the illumination light is a specified warm color is not fixed at 3000[K], but is changed within the range of 2700[K] to 3300[K]. For example, if a large sense of warmth is desired, the color temperature of the specified warm color is set to 2700K, and if a small sense of warmth is sufficient, the color temperature of the specified warm color is set to 3300K.

[0126] In addition, when the illumination light is a specified cool color, the color temperature of the illumination light is not fixed at 5500 [K], but is changed within the range of 5200 [K] to 5800 [K]. For example, if a large sense of coolness is desired, the color temperature of the specified cool color is set to 5800 [K], and if only a small sense of coolness is sufficient, the color temperature of the specified cool color is set to 5200 [K].

[0127] If a cooler feeling is desired, the upper limit of the color temperature of cool colors may be set to 12000[K]. If a warmer feeling is desired, the lower limit of the color temperature of warm colors may be set to 1800[K].

[0128] There may also be cases where it is desired to change the color temperature of the illumination light emitted by the lighting fixture 4 in normal times. For example, the color temperature of the illumination light in normal times may be increased in summer and decreased in winter. In such cases, the color temperature of the illumination light in normal times is changed, and the color temperature of the cool illumination light and the color temperature of the warm illumination light are changed based on the changed color temperature of the illumination light in normal times. This case will be specifically described with reference to FIG. 13.

[0129] As shown in Fig. 13, cool colors are set to be 1500[K] higher than the color temperature of normal illumination, and warm colors are set to be 1500[K] lower than the color temperature of normal illumination. For example, if the color temperature of normal illumination is 4200[K], warm colors are set to 2700[K], which is 1500[K] lower than the normal color temperature, and cool colors are set to 5700[K], which is 1500[K] higher than the normal color temperature. On the other hand, if the color temperature of normal illumination is 4700[K], warm colors are set to 3200[K], which is 1500[K] lower than the normal color temperature, and cool colors are set to 6200[K], which is 1500[K] higher than the normal color temperature.

[0130] In this way, even if the color temperature of the illumination light during normal times is changed depending on the season, it is possible to reduce the amount of power consumed in room 10 while preventing people in the room from feeling uncomfortable.

[0131] <4.4. Determining cool or warm color temperature based on the difference between indoor temperature and reference temperature range> It is believed that the more outside the standard temperature range the room temperature the greater the discomfort felt by people in the room. On the other hand, as mentioned above, it is believed that the greater the change in the color temperature of the illumination light, the greater the sense of coolness or warmth felt by the Hue-Heat effect. Therefore, the more outside the standard temperature range the room temperature is, the greater the change in the color temperature of the illumination light is.

[0132] A specific description will be given with reference to Fig. 14. Fig. 14 is a diagram for explaining the relationship between the difference between the reference temperature range and the indoor temperature, and the color temperatures of cool and warm light. For example, when the indoor temperature is higher than the reference temperature range, the difference TD is calculated as the difference between the indoor temperature and the upper limit value TH of the reference temperature range (difference TD = indoor temperature - upper limit value TH of appropriate temperature range). For example, when the indoor temperature is 1.5 [°C] higher than the reference temperature range, the difference TD is 1.5 [°C]. In this case, the tablet 6 sets the light temperature of the illumination light to 5700 [K] (Fig. 14).

[0133] Also, for example, when the indoor temperature is lower than the reference temperature range, the difference TD is calculated as the difference between the indoor temperature and the lower limit TL of the reference temperature range (difference TD = indoor temperature - lower limit TL of appropriate temperature range). For example, when the indoor temperature is 1 [°C] lower than the reference temperature range, the difference TD is -1 [°C]. In this case, the tablet 6 sets the light temperature of the illumination light to 3000 [K] (FIG. 14).

[0134] In this way, the color temperature of the warm or cool illumination light is changed based on the difference TD between the reference temperature range and the room temperature, so that people in the room can be given a more delicate feeling of coolness or warmth while preventing them from feeling too cool or warm.

[0135] <5. Modifications> <5.1. Variation 1: Determination of the reference temperature range based on location or region> In the above embodiment, an example in which the reference range is determined for each month has been described, but the present invention is not limited to this.

[0136] In this embodiment, the reference range for each month is determined based on the geographical location of the room 10. For example, the reference temperature range in Okinawa Prefecture is set 5°C higher than the reference temperature range in Hokkaido. In this modified example, the changed appropriate temperature range and appropriate humidity range are stored for each location or region.

[0137] In this modification, the appropriate temperature range and the appropriate humidity range are changed based on the geographical location or region of the room 10. Therefore, it is possible to more effectively prevent people in the room 10 from feeling uncomfortable and reduce the amount of power consumed in the room 10.

[0138] <5.2. Variation 2: Reference ranges by time, day, and season>

[0139] In the above embodiment, an example in which the reference range is set for each month has been described, but the present invention is not limited to this.

[0140] In this modification, the reference range is set not for each month, but for each time of day, each day, or each season.

[0141] When reference ranges are provided for each season, the memory size required to store the reference range data can be made smaller than when reference ranges are provided for each month.

[0142] On the other hand, at times such as when the seasons change, the outdoor temperature and the like tend to vary significantly from day to day. Therefore, when the reference range is set for each day, it is possible to control the illumination light more precisely than when the reference range is set for each month, or when the reference range is set for each month.

[0143] Furthermore, when a reference range is set for each time of day, it becomes possible to control the illumination light in response to temperature changes in the morning, afternoon, evening, etc. of a day. Therefore, compared to when the reference range is set for each month or day, it becomes possible to control the illumination light when a sudden change in the outside air temperature, etc. is expected.

[0144] <5.3. Modification 3: Reference temperature and reference humidity values> In the above-described embodiment and modified examples, examples have been described in which the reference range is set for each month, each day, etc. However, the present invention is not limited to this.

[0145] In this modified example, the reference range is not set for each month, day, time, etc., but the reference temperature value and the reference humidity value are set for each month, day, time, etc. Also, the reference temperature range is set to the reference temperature value ±1.5[°C], and the reference humidity range is set to the reference humidity value ±7.5[%].

[0146] In this modification, the reference temperature range and the reference humidity range are determined based on the reference temperature value and the reference humidity value, so that it is possible to suppress discomfort felt by people in the room 10 and reduce the amount of power consumed in the room 10 with a simpler configuration.

[0147] <5.4. Variation 4: Reference range based on outside air temperature> In the lighting system 1 according to the above-described embodiment and modification, an example has been described in which the reference range is determined for each month. However, the present invention is not limited to this. In this modification, the reference range is determined based on the outside air temperature. That is, in this modification, the reference range is determined for each outside air temperature.

[0148] How the reference range for each outside air temperature is determined will be described with reference to Fig. 15. Fig. 15 is a diagram for explaining the reference range for each outside air temperature.

[0149] In this modified example, first, an upper limit outdoor air temperature and a lower limit outdoor air temperature are determined. The upper limit outdoor air temperature is an outdoor air temperature above which the reference temperature range and the reference humidity range are constant when the outdoor air temperature exceeds the upper limit outdoor air temperature. The lower limit outdoor air temperature is an outdoor air temperature below which the reference temperature range and the reference humidity range are constant when the outdoor air temperature falls below the lower limit outdoor air temperature. In the example shown in FIG. 15, the upper limit outdoor air temperature is 30[°C] and the lower limit outdoor air temperature is 10[°C].

[0150] In this modified example, a reference temperature range and a reference humidity range are determined when the outdoor air temperature is the upper limit outdoor air temperature (30° C.) and when the outdoor air temperature is the lower limit outdoor air temperature (10° C.). Then, a reference temperature range and a reference humidity range corresponding to the outdoor air temperatures therebetween are determined by linear interpolation.

[0151] In this modification, the reference temperature range and the reference humidity range are determined based on the outdoor air temperature. Therefore, the lighting system 1b according to this embodiment can reduce the amount of power consumed in the room 10 while preventing people in the room 10 from feeling uncomfortable, even if the outdoor air temperature varies from month to month differently from usual.

[0152] <5.5. Variation 5: Judgment that prioritizes indoor humidity> In the lighting system 1 according to the above-described embodiment and modified example, in the lighting control process, it is determined whether the indoor temperature is within the reference temperature range before it is determined whether the indoor humidity is within the reference humidity range (FIG. 6). However, the present invention is not limited to this.

[0153] In this modification, in the lighting control process, whether or not the indoor humidity is within an appropriate temperature range is determined before whether or not the indoor temperature is within the appropriate temperature range, as shown in Fig. 16. Fig. 16 is a diagram for explaining the operation of the lighting control process according to the modification.

[0154] Hereinafter, this modified example will be described with reference to FIGS.

[0155] The lighting control process in this modification is the same as the lighting control process in the embodiment until the indoor temperature and indoor humidity are acquired (steps S201, S203) and after the lighting color is changed (steps S209, S215, S217). Specifically, steps S201, S203, S209, S215, and S217 shown in Fig. 12 are the same as steps S101, S103, S109, S115, and S117 shown in Fig. 6, respectively.

[0156] However, in the above embodiment, after acquiring the indoor temperature and indoor humidity (step S103), it is determined whether the indoor temperature is within a standard temperature range (step S105). On the other hand, in this modified example, after acquiring the indoor temperature and indoor humidity (step S203), it is determined whether the indoor humidity is within a standard humidity range (step S205).

[0157] In the embodiment, after determining whether the indoor temperature is within the standard temperature range (step S105), it is determined whether the indoor humidity is within the standard humidity range (step S107). On the other hand, in this modification, after determining whether the indoor humidity is within the standard humidity range (step S205), it is determined whether the indoor temperature is within the standard temperature range (step S207).

[0158] Therefore, in this modified example, even in a case where indoor humidity is more likely to affect the comfort of people in the room than indoor temperature, it is possible to prevent people in the room from feeling uncomfortable.

[0159] <5.6. Other Modifications> (1) Changing the color temperature of the illumination light emitted by the lighting fixture 4 and the operating conditions of the air conditioner 7 and the circulator 8 In the above-described embodiment and modified examples, examples have been described in which only the color temperature of the illumination light emitted by the lighting device 4 is changed. However, the present invention is not limited to this.

[0160] A lighting system 1c according to this modification further includes a circulator 8 disposed inside a room 10, in addition to the configuration of the lighting system 1 according to the embodiment shown in Fig. 1. The circulator 8 circulates air inside the room 10.

[0161] In this modification, in addition to changing the color temperature of the illumination light emitted by the lighting fixture 4, the operating conditions of the air conditioner 7 and the circulator 8 are changed. At that time, the tablet 6 wirelessly communicates with the air conditioner 7 and the circulator 8 and instructs the air conditioner 7 and the circulator 8 on the operating conditions of the air conditioner 7 and the circulator 8.

[0162] For example, when changing the illumination light emitted by the lighting fixture 4 to a cooler color, the temperature setting of the air conditioner 7 is lowered and the circulator 8 is operated or the amount of air output by the circulator 8 is increased. Also, when changing the illumination light emitted by the lighting fixture 4 to a warmer color, the temperature setting of the air conditioner 7 is raised and the circulator 8 is stopped or the amount of air output by the circulator 8 is reduced.

[0163] In this modification, in addition to changing the color temperature of the illumination light emitted by the lighting fixture 4, the temperature setting of the air conditioner 7 and the operating conditions of the circulator 8 are changed. This makes it possible to more effectively prevent people in the room 10 from feeling uncomfortable.

[0164] (2) Changing the operating conditions of Air Conditioner 7 In the above embodiment, an example has been described in which a decrease in comfort due to an increase or decrease in the indoor temperature is suppressed by simply changing the color temperature of the illumination light emitted by the lighting fixtures 4 when the air conditioner 7 is stopped. However, the present invention is not limited to this.

[0165] In this modification, if for some reason the indoor temperature falls far outside the reference temperature range, the air conditioner 7 is operated. For example, if the indoor temperature exceeds the reference temperature range by 3°C or more, the operating condition of the air conditioner 7 is set to cooling, and the target temperature is set to the upper limit value TH+1°C of the appropriate temperature range. Moreover, when the room temperature falls below the reference temperature range by 3° C. or more, the operating condition of the air conditioner 7 is set to heating, and the target temperature is set to the lower limit value TL-1° C. of the appropriate temperature range.

[0166] (3) Changing the light temperature of the lighting based only on the reference temperature range and the indoor temperature In the above-described embodiment and modified examples, examples have been described in which the color temperature of the light emitted by lighting device 4 is changed based on a reference temperature range and an indoor temperature, and a reference humidity range and an indoor humidity. However, the present invention is not limited to this.

[0167] In this modification, the color temperature of the light emitted by lighting fixtures 4 is changed based only on the reference temperature range and the room temperature. In this modification, the color temperature of the light emitted by lighting fixtures 4 is changed based only on the reference temperature range and the room temperature, making it possible, with a simpler configuration, to prevent people in room 10 from feeling uncomfortable and reduce the amount of electricity consumed in room 10.

[0168] (4) Obtaining outdoor temperature from outside In the above-described embodiment and modified examples, the outdoor temperature has been described as being acquired by a sensor such as the outdoor sensor 9. However, the outdoor temperature may be acquired from outside the lighting system. Specifically, the lighting system 1 may acquire the outdoor temperature from news, a weather forecast, or the like.

[0169] (5) Acquiring information from sensors In the above-described embodiment and modified example, the indoor sensor 5 transmits information on the indoor temperature and the indoor humidity to the tablet 6, and the outdoor sensor 9 transmits information on the outdoor temperature to the tablet 6. However, the present invention is not limited to this.

[0170] In this modification, the tablet 6 may read information on the indoor temperature, indoor humidity, and outdoor temperature stored in the indoor sensor 5 or the outdoor sensor 9.

[0171] (6) Indirect wireless communications In the above-described embodiment and modified examples, the tablet 6 has been described as directly communicating wirelessly with other devices. However, the tablet 6 may communicate wirelessly with other devices indirectly. For example, in FIG. 1, the tablet 6 may communicate wirelessly with the lighting device 4 via another device (not shown).

[0172] (7) Communication specifications In the above-described embodiment and modified examples, the communication between the tablet 6, the air conditioner 7, the circulator 8, the lighting fixture 4, the indoor sensor 5, and the outdoor sensor 9 has been described as using the same communication specifications. However, the communication may use the same communication specifications or may use multiple communication specifications. Furthermore, each of the tablet 6, the air conditioner 7, the circulator 8, the lighting fixture 4, the indoor sensor 5, and the outdoor sensor 9 may communicate using multiple communication specifications.

[0173] (8) Lighting control devices In the above-described embodiment and modified examples, the lighting control device is a tablet 6. However, the lighting control device may be any device or equipment that has a function for controlling lighting fixtures 4 and the like, and may be, for example, a laptop personal computer or a smartphone.

[0174] <6. Extraction of inventions> As inventions that can be extracted from the above-described embodiment and modifications, the following inventions can be mentioned, for example.

[0175] (1) A lighting system according to one embodiment of the present invention is a lighting system comprising lighting fixtures that emit illumination light and a lighting control device that controls the lighting fixtures, wherein the lighting control device acquires an indoor temperature, which is the temperature inside a room, has a plurality of reference temperature ranges, selects one reference temperature range from the plurality of reference temperature ranges, and, if the indoor temperature is higher than an upper limit value of the selected reference temperature range, instructs the lighting fixtures to change the color temperature of the illumination light to a higher value, and, if the indoor temperature is lower than a lower limit value of the selected reference temperature range, instructs the lighting fixtures to change the color temperature of the illumination light to a lower value.

[0176] With these configurations, the lighting system according to an embodiment of the present invention can suppress a decrease in the comfort of people in a room even when the situation changes, and can also reduce power consumption.

[0177] (2) In the lighting system, the lighting control device may acquire indoor humidity, which is the humidity inside the room, have a plurality of standard humidity ranges, select one standard humidity range from the plurality of standard humidity ranges, and, if the indoor temperature is within the standard temperature range corresponding to the selected situation and the indoor humidity is higher than an upper limit value of the standard humidity range corresponding to the selected situation, instruct the lighting device to change the color temperature of the illumination light to a higher value, and, if the indoor temperature is within the standard temperature range corresponding to the selected situation and the indoor humidity is lower than a lower limit value of the standard humidity range corresponding to the selected situation, instruct the lighting device to change the color temperature of the illumination light to a lower value.

[0178] As a result of having these configurations, the lighting system according to an embodiment of the present invention can suppress a decrease in the comfort of people in the room even in cases where humidity could cause a decrease in the comfort of people in the room.

[0179] (3) After instructing the lighting device to change the color temperature of the illumination light to a higher or lower color temperature, the lighting device may be instructed to change the color temperature of the illumination light to a pre-change color temperature, which is the color temperature of the illumination light before the instruction to change the color temperature of the illumination light to a higher or lower color temperature.

[0180] With these configurations, the lighting system according to an embodiment of the present invention can maintain the Hue-Heat effect even if the Hue-Heat effect weakens over time. In other words, it is possible to continue to suppress discomfort felt by people in the room.

[0181] (4) In the lighting system, the time required for the color temperature of the illumination light to change from the pre-change color temperature to a post-change color temperature, which is the color temperature after the change when instructing to change the color temperature of the illumination light higher or lower, may be shorter than the time required for the color temperature to change from the post-change color temperature to the pre-change color temperature.

[0182] With these configurations, the lighting system according to one embodiment of the present invention makes people in the room feel cool or warm when the lighting temperature is changed from the pre-change color temperature to the post-change color temperature, but makes people in the room feel less cool or warm when the light temperature of the lighting light is changed from the post-change color temperature to the pre-change color temperature. Therefore, it is possible to suppress people in the room from feeling uncomfortable when the color temperature of the lighting light is changed.

[0183] (5) In the lighting system, an outside air temperature, which is the temperature outside a building in which the room is located, may be acquired, and the reference temperature range or the reference humidity range may be determined based on the outside air temperature.

[0184] As a result of having these configurations, the lighting system of one embodiment of the present invention can prevent people in the room from feeling uncomfortable even if the outside air temperature changes differently from usual.

[0185] (6) In the lighting system, an outside air temperature, which is the temperature outside the building in which the room is located, is acquired, and if the outside air temperature is higher than an upper limit of the reference temperature range by a predetermined value or more, when it is detected that a person has entered the room from outside the building, the lighting system instructs the lighting fixture to change the color temperature of the illumination light to a higher color temperature, and if the outside air temperature is lower than a lower limit of the reference temperature range by a predetermined value or more, when it is detected that a person has entered the room from outside the building, the lighting system instructs the lighting fixture to change the color temperature of the illumination light to a lower color temperature.

[0186] With these configurations, the lighting system according to an embodiment of the present invention can prevent people who enter the room from the outside of the building from feeling uncomfortable.

[0187] (7) In the lighting system, the plurality of reference temperature ranges and the plurality of reference humidity ranges may include reference temperature ranges and reference humidity ranges for each season, month, day, time, outdoor temperature, or a specified region.

[0188] With these configurations, the lighting system according to an embodiment of the present invention can more carefully prevent people in the room from feeling uncomfortable.

[0189] (8) In the lighting system, the reference temperature range may be changed in response to an instruction from a user.

[0190] With these configurations, the lighting system according to one embodiment of the present invention can reduce discomfort felt by people in the room, depending on the physical condition, tendencies, and preferences of the people in the room.

[0191] The above describes the embodiments and modifications of the present invention, and inventions that can be extracted from the embodiments and modifications. These embodiments are merely examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. Furthermore, these embodiments and modifications are included in the scope of the invention and its equivalents as described in the claims, as well as in the scope and gist of the invention. [Explanation of symbols]

[0192] 1, 1a, 1b, 1c: Lighting system 4, 4a, 4b, :Lighting equipment 5, 5a, 5b: Indoor sensors 6: Tablet 7, 7a, 7b: Air conditioner 8: Circulator 9, 9b: Outdoor sensor 10, 10a, 10b: Rooms 41:Light source section 43:Circuit section 45: WM Department 45a: Wireless communication section 45b: Control section 45c: Storage section 61: Control section 62: Storage section 63: Wireless communication section 64: Touch panel

Claims

1. A lighting system including a lighting fixture that emits illumination light and a lighting control device that controls the lighting fixture, The lighting control device includes: Obtain the indoor temperature, which is the temperature inside the room, It has multiple reference temperature ranges, Selecting one reference temperature range from the plurality of reference temperature ranges; instructing the lighting fixture to change the color temperature of the illumination light to a higher value when the indoor temperature is higher than an upper limit value of the selected reference temperature range; When the indoor temperature is lower than a lower limit value of the selected reference temperature range, an instruction is given to the lighting device to change the color temperature of the illumination light to a lower value. Lighting system.

2. The lighting control device includes: Obtaining indoor humidity, which is the humidity inside the room; It has multiple reference humidity ranges, Selecting one reference humidity range from the plurality of reference humidity ranges; instructing the lighting device to change the color temperature of the illumination light to a higher value when the indoor temperature is within the selected reference temperature range and the indoor humidity is higher than an upper limit value of the selected reference humidity range; when the indoor temperature is within the selected reference temperature range and the indoor humidity is lower than a lower limit value of the selected reference humidity range, instructing the lighting device to change the color temperature of the illumination light to a lower value.

10. The lighting system of claim 1.

3. After instructing the lighting device to change the color temperature of the illumination light to a higher or lower color temperature, instructing the lighting device to change the color temperature of the illumination light to a pre-change color temperature, which is the color temperature of the illumination light before instructing the lighting device to change the color temperature of the illumination light to a higher or lower color temperature.

3. A lighting system according to claim 1 or 2.

4. a time required for the color temperature of the illumination light to change from the pre-change color temperature to a post-change color temperature, which is a color temperature after the change when instructing to change the color temperature of the illumination light higher or lower, is shorter than a time required for the color temperature to change from the post-change color temperature to the pre-change color temperature.

4. The lighting system of claim 3.

5. Obtaining an outside air temperature, which is the temperature outside the building in which the room is located; determining the reference temperature range or the reference humidity range based on the outside air temperature; 3. A lighting system according to claim 1 or 2.

6. Obtaining an outside air temperature, which is the temperature outside the building in which the room is located; when detecting that a person has entered the room from outside the building in a case where the outside air temperature is higher than an upper limit value of the reference temperature range by a predetermined value or more, instructing the lighting fixture to change the color temperature of the illumination light to a higher value; and when it is detected that a person has entered the room from outside the building in a case where the outside air temperature is lower than a lower limit value of the reference temperature range by a predetermined value or more, instructing the lighting device to change the color temperature of the illumination light to a lower value.

10. The lighting system of claim 1.

7. The plurality of reference temperature ranges and the plurality of reference humidity ranges include reference temperature ranges and reference humidity ranges for each season, month, day, time, outdoor temperature, or predetermined region.

3. The lighting system of claim 2.

8. The reference temperature range is changed in response to a user instruction.

10. The lighting system of claim 1.

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