Lighting system

Abstract

To provide a lighting system capable of mitigating visual discomfort of a person existing in an object space.SOLUTION: A lighting system 100 comprises a plurality of lighting apparatuses 1, an acquisition unit 21, a calculation unit 22, and an indication unit 23. The acquisition unit 21 acquires a desired light color, which is a light color of light with which irradiation is desired for each of the plurality of lighting apparatuses 1, for each of the plurality of lighting apparatuses 1. When respective desired light colors of the plurality of lighting apparatuses 1 are different, the calculation unit 22 calculates a difference between desired light colors on a combination of any two lighting apparatuses 1 of the plurality of lighting apparatuses 1. The indication unit 23 indicates an indication light color, which is a light color of light with which each of the two lighting apparatuses 1 must perform irradiation, to at least one of the two lighting apparatuses 1 so that the difference between the desired light colors is equal to or smaller than a previously set color difference limit value.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates generally to lighting systems, and more particularly to lighting systems comprising a plurality of lighting fixtures. [Background technology]

[0002] Patent Document 1 discloses a lighting system comprising a lighting device equipped with a light source and a control device that controls the on / off of the light source of the lighting device and the illuminance of the light source at a predetermined position. The control device comprises a clocking means that keeps time, a color temperature control means that controls the color temperature of the light source to vary within a specified value on an hourly basis based on the time kept by the clocking means, and an illuminance control means that controls the illuminance of the light source to vary within a specified value over a predetermined period of time based on the time kept by the clocking means. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-23339 Summary of the Invention [Problem to be solved by the invention]

[0004] In a lighting system that includes multiple lighting fixtures that each emit light in a corresponding area of ​​the same target space, the lighting fixtures may emit different light colors, which may cause visual discomfort to people in the target space.

[0005] An object of the present disclosure is to provide a lighting system that can reduce visual discomfort experienced by people present in a target space. [Means for solving the problem]

[0006] A lighting system according to one aspect of the present disclosure includes a plurality of lighting fixtures, an acquisition unit, a calculation unit, and an instruction unit. Each of the plurality of lighting fixtures emits light to a corresponding area of ​​the same target space. The acquisition unit acquires a desired light color, which is the light color of the light that is requested to be emitted by each of the plurality of lighting fixtures, for each of the plurality of lighting fixtures. If the desired light colors of the plurality of lighting fixtures are different, the calculation unit calculates the difference in the desired light colors for a combination of any two of the plurality of lighting fixtures. The instruction unit instructs at least one of the two lighting fixtures on a designated light color, which is the light color of the light that each of the two lighting fixtures should emit, so that the difference in the desired light colors is equal to or less than a predetermined color difference limit value. [Effects of the Invention]

[0007] The present disclosure has the advantage of reducing visual discomfort felt by people present in the target space. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a lighting system according to this embodiment. [Figure 2] FIG. 2 is an explanatory diagram illustrating a target space in which a plurality of lighting fixtures in the lighting system are installed. [Figure 3] FIG. 3 is a graph showing the relationship between color temperature and the percentage of people who felt uncomfortable due to differences in color in the above lighting system. [Figure 4] FIG. 4 is a graph showing the relationship between color temperature and the percentage of people who noticed a difference in color in the above lighting system. [Figure 5] FIG. 5 is an explanatory diagram illustrating a target space in which a plurality of lighting fixtures are installed in a lighting system according to a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] The embodiments and modifications described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and modifications, and various modifications other than these embodiments and modifications are possible depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure. The drawings described in the following embodiments and modifications are schematic drawings, and the ratios of the sizes and thicknesses of the components in the drawings do not necessarily reflect the actual dimensional ratios.

[0010] (Embodiment) (1) Overview An outline of a lighting system 100 according to this embodiment will be described below with reference to FIGS.

[0011] The lighting system 100 according to this embodiment is used, for example, to illuminate a target space A1 (see FIG. 2) in a facility. The facility is, for example, a residential facility such as a detached house or an apartment building. The facility may also be, for example, an office building, a store, a warehouse, an art museum, a hotel, a factory, a stadium, an airport, etc. The target space A1 is a space used by a person P1 in the facility. The target space A1 is, for example, a living room, a dining room, a kitchen, etc. In the following description, it is assumed that the target space A1 is a living room in a residential facility.

[0012] As shown in FIG. 1, lighting system 100 of this embodiment includes multiple lighting fixtures 1, an acquisition unit 21, a calculation unit 22, and an instruction unit 23. Each of the multiple lighting fixtures 1 emits light into a corresponding area E1 in the same target space A1, as shown in FIG. 2. Acquisition unit 21 acquires a desired light color, which is the light color of light desired to be emitted by each of the multiple lighting fixtures 1, for each of the multiple lighting fixtures 1. If the desired light colors of the multiple lighting fixtures 1 are different, calculation unit 22 calculates the difference in the desired light colors for a combination of any two of the multiple lighting fixtures 1. Instruction unit 23 instructs at least one of the two lighting fixtures 1 in the combination calculated by calculation unit 22 on the designated light color, which is the light color of light to be emitted by each of the two lighting fixtures 1 in the combination calculated by calculation unit 22, so that the difference in the desired light colors calculated by calculation unit 22 is equal to or less than a predetermined color difference limit value.

[0013] As described above, lighting system 100 of this embodiment can prevent person P1 present in target space A1 from feeling visual discomfort by having each of the two lighting devices 1 in the combination calculated by calculation unit 22 emit light whose light color difference is equal to or less than the color difference limit (i.e., light whose light color difference is small). In other words, lighting system 100 of this embodiment has the advantage of being able to reduce visual discomfort felt by person P1 present in target space A1.

[0014] (2) Detailed configuration (2-1) Lighting system The detailed configuration of the lighting system 100 of this embodiment will be described below with reference to FIGS.

[0015] 1 and 2, lighting system 100 of this embodiment includes multiple (three) lighting fixtures 1, an adjustment device 2, and multiple (three) operation terminals 3. Below, the three lighting fixtures 1 may be referred to as lighting fixtures 1a to 1c. Similarly, the three operation terminals 3 may be referred to as operation terminals 3a to 3c.

[0016] The lighting system 100 of this embodiment adjusts (i.e., adjusts) the color of light emitted by each of the multiple lighting devices 1 according to the situation in which each of the multiple people P1 present in the target space A1 of the facility is using the target space A1. Here, the "situation in which each of the multiple people P1 is using the target space A1" refers to, for example, situations in which each of the multiple people P1 is working or studying, watching television, exercising, reading, eating, cooking, etc. in the target space A1. In the following description, it is assumed that, as shown in FIG. 2, there are three people P1 present in the target space A1 of the facility, and of the three people P1, person P1a is walking down the stairs, person P1b is reading while sitting on a sofa, and person P1c is working while sitting in a chair at a desk.

[0017] (2-2) Lighting equipment As shown in Fig. 2, each of the lighting fixtures 1 of this embodiment emits light onto a corresponding area E1 in the same target space A1. More specifically, lighting fixture 1a corresponds to area E1a where person P1a walking down the stairs is located (i.e., where stairs are installed), and emits light onto area E1a. Lighting fixture 1b corresponds to area E1b where person P1b sitting on a sofa reading is located (i.e., where a sofa is installed), and emits light onto area E1b. Lighting fixture 1c corresponds to area E1c where person P1c sitting on a desk chair working is located (i.e., where a desk is installed), and emits light onto area E1c.

[0018] Each of the lighting fixtures 1 of this embodiment is installed on the ceiling of the target space A1 of the facility. More specifically, lighting fixture 1a is a ceiling-mounted lighting fixture (ceiling light). Lighting fixture 1b is a ceiling-suspended lighting fixture (spotlight), and lighting fixture 1c is a ceiling-embedded lighting fixture (downlight).

[0019] As shown in FIG. 1, each of the lighting fixtures 1 includes a light source 11, a control unit 12, and a communication unit 13.

[0020] The light source 11 emits light. More specifically, the light source 11 converts power supplied from an external power source into light and emits the light. The light source 11 has a variable light color (color temperature). The light source 11 has (i.e., is built-in) a plurality of light-emitting elements each emitting a different light color. Each of the plurality of light-emitting elements is, for example, an LED (Light Emitting Diode). However, the light source 11 may have a light-emitting element other than an LED, such as an organic EL (Electro Luminescence) element or a laser diode.

[0021] The control unit 12 controls whether the light source 11 emits light. More specifically, the control unit 12 controls whether the light source 11 emits light by controlling whether to supply power to the light source 11. The control unit 12 of this embodiment controls whether the light source 11 emits light based on desired illumination information I1 (see FIG. 1 ) received by the communication unit 13 from a communication unit 34 (described later) of the operation terminal 3. That is, the control unit 12 of this embodiment controls whether the light source 11 emits light in accordance with an operation received by an operation unit 31 (described later) of the operation terminal 3.

[0022] Furthermore, the control unit 12 controls the light color of the light source 11. More specifically, the control unit 12 controls the light color of the light source 11 by increasing or decreasing the power supplied to each of a plurality of light-emitting elements built into the light source 11 that emit light of different colors. The control unit 12 of this embodiment controls the light color of the light source 11 based on instruction information I3 (see FIG. 1 ) received by the communication unit 13 from a communication unit 25 (described later) of the adjustment device 2. That is, the control unit 12 of this embodiment controls the light color of the light source 11 according to the instruction content of an instruction unit 23 (described later) of the adjustment device 2.

[0023] The communication unit 13 is configured to be able to communicate with a communication unit 34 (described later) of a corresponding operation terminal 3 among the multiple operation terminals 3, and with a communication unit 25 of the adjustment device 2. In this embodiment, the communication unit 13 is a communication module that is able to wirelessly communicate with the communication unit 34 of the corresponding operation terminal 3 and the communication unit 25 of the adjustment device 2. As an example, the communication method between the communication unit 13 and the communication unit 34 of the operation terminal 3 is infrared communication. Furthermore, the communication method between the communication unit 13 and the communication unit 25 of the adjustment device 2 is wireless communication that complies with a communication standard such as Wi-Fi (registered trademark). Note that the communication method is not limited to the above.

[0024] The communication unit 13 receives desired illumination information I1 (see FIG. 1) from the communication unit 34 of the operation terminal 3 and outputs the received desired illumination information I1 to the control unit 12. Furthermore, the communication unit 13 receives desired light color information I2 (see FIG. 1) from the communication unit 34 of the operation terminal 3 and transmits it to the communication unit 25 of the adjustment device 2. That is, the desired light color information I2 is transmitted from the communication unit 34 of the operation terminal 3 to the communication unit 25 of the adjustment device 2 via the communication unit 13 of the lighting fixture 1.

[0025] The communication unit 13 receives instruction information I3 (see FIG. 1) from the communication unit 25 of the adjustment device 2, and outputs the received instruction information I3 to the control unit 12.

[0026] (2-3) Adjustment device The adjustment device 2 is placed in the target space A1 as shown in Figure 2. More specifically, the adjustment device 2 is installed on a wall surface of the target space A1. The adjustment device 2 has a function of adjusting the light color of each of the multiple lighting devices 1 based on desired light color information I2 transmitted from the operation terminal 3.

[0027] As shown in FIG. 1, the adjustment device 2 includes an acquisition unit 21, a calculation unit 22, an instruction unit 23, a designation unit 24, and a communication unit 25.

[0028] The adjustment device 2 is realized, for example, by a computer system having one or more processors and one or more memories. That is, the functions of the acquisition unit 21, calculation unit 22, instruction unit 23, and designation unit 24 are realized by one or more processors executing a program recorded in the memory. The program may be pre-recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be recorded on a non-transitory recording medium such as a memory card and provided.

[0029] (Acquisition Department) Acquisition unit 21 acquires, for each of the lighting fixtures 1, a desired light color, which is the light color that person P1 present in target space A1 requests each of the lighting fixtures 1 to emit. More specifically, acquisition unit 21 acquires the desired light color for each of the lighting fixtures 1 based on desired light color information I2 (see FIG. 1 ) received by communication unit 25 from communication unit 13 of each of the lighting fixtures 1.

[0030] (designated part) The designation unit 24 designates one of the plurality of lighting fixtures 1 as the main lighting fixture X1 (see FIG. 2 ). For example, the designation unit 24 designates a lighting fixture 1 selected by a person P1 present in the target space A1 as the main lighting fixture X1. In this case, the person P1 present in the target space A1 may select the lighting fixture 1 to be designated as the main lighting fixture X1 via the operation terminal 3 or may select the lighting fixture 1 using a switch (e.g., a DIP switch) provided on the adjustment device 2. Furthermore, the designation unit 24 may designate a lighting fixture 1 that was set in advance (e.g., during installation) as the main lighting fixture X1. Note that in this embodiment, it is assumed that the designation unit 24 designates lighting fixture 1b of the plurality of lighting fixtures 1 as the main lighting fixture X1.

[0031] (Calculation Department) When the desired light color differs among the multiple lighting fixtures 1, calculation unit 22 calculates the difference in the desired light color among multiple combinations of any two lighting fixtures 1. In this disclosure, the "difference in desired light color" refers to the difference in color temperature or correlated color temperature between the light color desired to be emitted from one lighting fixture 1 and the light color desired to be emitted from the other lighting fixture 1 in a combination of two lighting fixtures 1. In other words, calculation unit 22 calculates the difference in desired light color in color temperature or correlated color temperature.

[0032] In this embodiment, when the desired light colors of the multiple lighting fixtures 1 are different, calculation unit 22 calculates the difference in desired light color between the combination of primary lighting fixture X1 and each of the remaining lighting fixtures X2 (see FIG. 2 ) that are different from primary lighting fixture X1 among the multiple lighting fixtures 1. Here, the "remaining lighting fixtures X2 that are different from primary lighting fixture X1 among the multiple lighting fixtures 1" refers to the lighting fixtures 1 that are not designated as primary lighting fixture X1 by designation unit 24, which in this embodiment refers to lighting fixture 1a and lighting fixture 1c. That is, in this embodiment, calculation unit 22 calculates the difference in desired light color between the combination of lighting fixture 1b and each of lighting fixtures 1a and 1c among the multiple lighting fixtures 1 that are different from primary lighting fixture X1.

[0033] (instruction section) Instructor 23 instructs each of the two lighting devices 1 in the combinations calculated by calculator 22 to specify an instruction light color, which is the light color of light that each of the two lighting devices 1 should emit, so that the difference in the desired light color calculated by calculator 22 is equal to or less than a predetermined color difference limit value. Instructor 23 then generates instruction information I3 including the instruction light color and associates it with each of the two lighting devices 1 in each of the combinations.

[0034] In this embodiment, the instructing unit 23 instructs the primary lighting fixture X1 to set the desired light color for the primary lighting fixture X1 as the indicated light color, and instructs each of the remaining lighting fixtures X2 to set the indicated light color so that the difference in the desired light color calculated by the calculation unit 22 is equal to or less than the color difference limit. Specifically, the instructing unit 23 in this embodiment instructs the lighting fixture 1b to set the desired light color for the lighting fixture 1b as the indicated light color. In addition, the instructing unit 23 in this embodiment instructs the lighting fixture 1a to set the indicated light color so that the difference in the desired light color between the combination of the lighting fixtures 1b and 1a is equal to or less than the color difference limit. Similarly, the instructing unit 23 in this embodiment instructs the lighting fixture 1c to set the indicated light color so that the difference in the desired light color between the combination of the lighting fixtures 1b and 1c is equal to or less than the color difference limit.

[0035] That is, the instructing unit 23 of this embodiment instructs the primary lighting fixture X1 to emit a desired light color, which is the light color that the person P1 in the target space A1 requests the primary lighting fixture X1 to emit. Meanwhile, the instructing unit 23 of this embodiment instructs each of the remaining lighting fixtures X2 to emit a desired light color, which is the light color that the person P1 in the target space A1 requests the remaining lighting fixtures X2 to emit, adjusted so that the difference between the desired light colors calculated by the calculation unit 22 is equal to or less than the color difference limit. In other words, the instructing unit 23 of this embodiment instructs each of the multiple lighting fixtures 1 to emit a desired light color, which is the light color that the person P1 in the target space A1 requests the remaining lighting fixtures X2 to emit, without adjusting the light color of the light emitted by the primary lighting fixture X1. Specifically, in this embodiment, the instructing unit 23 instructs each of the plurality of lighting fixtures 1 to adjust the color of light emitted by lighting fixture 1a and lighting fixture 1c, without adjusting the color of light emitted by lighting fixture 1b. The above configuration has the advantage of reducing the visual discomfort felt by person P1 present in target space A1 when primary lighting fixture X1 is emitting light of a desired color, which is the color of light desired by person P1 present in target space A1.

[0036] Furthermore, in this embodiment, the instructing unit 23 instructs each of the remaining lighting fixtures X2 to use a different instruction light color so that the difference in the desired light color calculated by the calculation unit 22 is equal to or less than the color difference limit and the sum of the differences between the desired light color and the instruction light color for each of the remaining lighting fixtures X2 is minimized. In other words, the instructing unit 23 instructs each of the two lighting fixtures 1 in each of the multiple combinations to use a different instruction light color so that the difference in the desired light color for each of the multiple combinations calculated by the calculation unit 22 is equal to or less than the predetermined color difference limit and the sum of the differences between the desired light color and the instruction light color for each of the multiple lighting fixtures 1 is minimized. In other words, the instructing unit 23 instructs each of the two lighting fixtures 1 in each of the multiple combinations to use a different instruction light color so that the difference in the desired light color for each of the multiple combinations calculated by the calculation unit 22 is equal to or less than the predetermined color difference limit and the sum of the adjustment amounts from the desired light color to the instruction light color for each of the multiple lighting fixtures 1 is minimized. This configuration reduces the difference between the desired light color, which is the light color that person P1 in target space A1 requests from each of the multiple lighting devices 1, and the instructed light color that indicator 23 instructs each of the multiple lighting devices 1 to provide. This has the advantage of reducing the visual discomfort felt by person P1 in target space A1 and enabling the illumination of light that is close to the light color desired by person P1 in target space A1.

[0037] The color difference limit value is set according to the distance between the two lighting devices 1. That is, in this embodiment, the color difference limit value is set according to the distance between the primary lighting device X1 and each of the remaining lighting devices X2. With this configuration, the indicator 23 can indicate the indicated light color according to the distance between the two lighting devices 1. Since it is considered that the closer the distance between the two lighting devices 1 is, the more likely a person P1 present in the target space A1 will experience visual discomfort, this has the advantage of effectively reducing the visual discomfort felt by the person P1 present in the target space A1.

[0038] 3 shows graph G1, which illustrates the relationship between the color (color temperature) of the light emitted by each of the two lighting fixtures 1 and the percentage of people who find the difference in color uncomfortable. As shown in graph G1, experiments have shown that when the percentage of people who find the difference in color uncomfortable is 50%, the difference in color temperature D1 between the light emitted by each of the two lighting fixtures 1 is 1857 K. Furthermore, as shown in graph G1, experiments have shown that when the difference in color temperature D1 between the light emitted by each of the two lighting fixtures 1 exceeds 1857 K, the rate of increase in the number of people who find the difference in color uncomfortable decreases.

[0039] Furthermore, as shown in graph G1, experiments have shown that when the percentage of people who find the difference in light color uncomfortable is 20%, the color temperature difference D2 between the light colors emitted by the two lighting fixtures 1 is 1100 K. In other words, when the color temperature difference D2 between the light colors emitted by the two lighting fixtures 1 is 1100 K, the percentage of people who find the difference in light color uncomfortable is lower than when the color temperature difference D1 between the light colors emitted by the two lighting fixtures 1 is 1900 K.

[0040] For this reason, the color difference limit value in this embodiment is set to 1900 K when the distance between the two lighting fixtures 1 (i.e., the distance between the primary lighting fixture X1 and each of the remaining lighting fixtures X2) is 1 meter or more, and is set to 1100 K when the distance between the two lighting fixtures 1 is less than 1 meter. With this configuration, when the distance between the two lighting fixtures 1 is 1 meter or more, the difference between the desired light color, which is the light color that person P1 in the target space A1 requests from the primary lighting fixture X1, and the indicated light color indicated by the indicator 23 is small. This makes it possible to emit light that is close to the light color desired by person P1 in the target space A1. Furthermore, when the distance between the two lighting fixtures 1 is less than 1 meter, person P1 in the target space A1 is likely to experience visual discomfort more easily than when the distance between the two lighting fixtures 1 is 1 meter or more. Therefore, the indicator 23 can indicate the indicated light color so as to reduce the percentage of people who experience discomfort due to the difference in light color. In short, the advantage is that the visual discomfort of the person P1 present in the target space A1 can be effectively reduced, and light close to the light color desired by the person P1 present in the target space A1 can be emitted.

[0041] (Communications Department) The communication unit 25 is configured to be able to communicate with the communication unit 13 in each of the multiple lighting fixtures 1. In this embodiment, the communication unit 25 is a communication module that is able to communicate wirelessly with the communication unit 13 in each of the multiple lighting fixtures 1. As an example, the communication method between the communication unit 25 and the communication unit 13 in each of the multiple lighting fixtures 1 is wireless communication that complies with a communication standard such as Wi-Fi. Note that the communication method is not limited to the above.

[0042] The communication unit 25 receives the desired light color information I2 (see FIG. 1) from each of the lighting fixtures 1, and outputs the received desired light color information I2 to the acquisition unit 21.

[0043] Communication unit 25 transmits instruction information I3 (see FIG. 1) generated by instruction unit 23 to communication unit 13 in each of the plurality of lighting devices 1. More specifically, communication unit 25 transmits instruction information I3 (see FIG. 1) generated by instruction unit 23 to a lighting device 1 among the plurality of lighting devices 1 that is linked to instruction information I3.

[0044] (2-4) Operation terminal Each of the multiple operation terminals 3 is a terminal that accepts operations (e.g., operations to turn on, turn off, and adjust the color) by a person P1 present in the target space A1 of the facility. Each of the multiple operation terminals 3 corresponds one-to-one to a multiple lighting fixture 1, and accepts operations by the person P1 for the corresponding lighting fixture 1. More specifically, operation terminal 3a corresponds to lighting fixture 1a, and accepts operations by the person P1 for the corresponding lighting fixture 1a. Similarly, operation terminal 3b corresponds to lighting fixture 1b, and accepts operations by the person P1 for the corresponding lighting fixture 1b. Furthermore, operation terminal 3c corresponds to lighting fixture 1c, and accepts operations by the person P1 for the corresponding lighting fixture 1c.

[0045] In this embodiment, each of the multiple operation terminals 3 is a remote control device that receives operations from multiple people P1 on a corresponding lighting fixture 1 and transmits desired illumination information I1 via wireless communication to the corresponding lighting fixture 1 in response to the received operation. Each of the multiple operation terminals 3 may be fixed to a predetermined position, such as a wall, in the target space A1 of the facility, or may be a freely portable terminal.

[0046] Each of the plurality of operation terminals 3 includes an operation unit 31, a generation unit 32, a display unit 33, and a communication unit .

[0047] The operation unit 31 accepts an operation by the person P1 on the corresponding lighting fixture 1. More specifically, the operation unit 31 accepts an operation by the person P1 requesting that the corresponding lighting fixture 1 start emitting light (i.e., a turn-on operation). The operation unit 31 also accepts an operation by the person P1 requesting that the corresponding lighting fixture 1 stop emitting light (i.e., a turn-off operation). The operation unit 31 also accepts an operation by the person P1 regarding a desired light color, which is the light color that the person P1 is requested to emit from the corresponding lighting fixture 1 (i.e., a color adjustment operation). In this embodiment, the "desired light color" is the color temperature or correlated color temperature value of the light color that the person P1 is requested to emit from the corresponding lighting fixture 1. The operation unit 31 is, for example, a mechanical switch. Note that the operation unit 31 is not limited to a mechanical switch and may be, for example, a keyboard, a pointing device, etc.

[0048] Based on the operation received by the operation unit 31, the generation unit 32 generates requested illumination information I1 indicating whether the person P1 requests the corresponding lighting device 1 to start or stop emitting light. That is, the requested illumination information I1 indicates whether the person P1 requests the corresponding lighting device 1 to emit light. Furthermore, based on the operation received by the operation unit 31, the generation unit 32 generates requested light color information I2 indicating a requested light color, which is the light color that the person P1 requests the corresponding lighting device 1 to emit.

[0049] The display unit 33 displays the content received by the operation unit 31. In other words, the display unit 33 displays the desired illumination information I1 and desired light color information I2 generated by the generation unit 32. Therefore, a person P1 who requests turning on, off, or adjusting the color of a corresponding lighting fixture 1 can operate the operation unit 31 while checking the content displayed on the display unit 33. The display unit 33 is, for example, a display panel (liquid crystal panel). Note that each of the multiple operation terminals 3 is equipped with a touch panel display, and the touch panel display may function as the operation unit 31 and the display unit 33.

[0050] The communication unit 34 is configured to be able to communicate with the communication unit 13 of the corresponding lighting fixture 1. In this embodiment, the communication unit 34 is a communication module that is able to communicate wirelessly with the communication unit 13 of the corresponding lighting fixture 1. As an example, the communication method between the communication unit 34 and the communication unit 13 of the corresponding lighting fixture 1 is infrared communication. Note that the communication method is not limited to the above.

[0051] The communication unit 34 transmits the desired illumination information I1 and desired light color information I2 generated by the generation unit 32 to the communication unit 13 of the corresponding lighting fixture 1.

[0052] (3) Effects In the lighting system 100 according to this embodiment, when the desired light colors of the lighting fixtures 1 are different, the calculation unit 22 calculates the difference in the desired light colors for a combination of any two of the lighting fixtures 1, and the instruction unit 23 instructs each of the two lighting fixtures 1 in the combination calculated by the calculation unit 22 to specify the desired light color, which is the light color that each of the two lighting fixtures 1 should emit, so that the difference in the desired light colors calculated by the calculation unit 22 is equal to or less than a predetermined color difference limit. This causes each of the two lighting fixtures 1 in the combination calculated by the calculation unit 22 to emit light whose difference in light color is equal to or less than the color difference limit (i.e., light whose difference in light color is small), thereby reducing visual discomfort felt by a person P1 present in the target space A1. In other words, the lighting system 100 according to this embodiment has the advantage of reducing visual discomfort felt by a person P1 present in the target space A1.

[0053] Furthermore, in the lighting system 100 according to this embodiment, the color difference limit value is set according to the distance between the two lighting devices 1. This allows the indicator 23 to indicate the indicator light color according to the distance between the two lighting devices 1. This has the advantage of effectively reducing visual discomfort felt by the person P1 present in the target space A1.

[0054] Furthermore, in lighting system 100 according to this embodiment, the color difference limit is set to 1900K when the distance between the two lighting fixtures 1 (i.e., the distance between the main lighting fixture X1 and each of the remaining lighting fixtures X2) is 1m or greater, and is set to 1100K when the distance between the two lighting fixtures 1 is less than 1m. This has the advantage of effectively reducing the visual discomfort felt by person P1 present in target space A1 and emitting light that is close to the light color desired by person P1 present in target space A1.

[0055] Furthermore, in lighting system 100 according to this embodiment, instructing unit 23 instructs each of the two lighting devices 1 in each of the plurality of combinations to select a desired light color such that the difference in the desired light color for each of the plurality of combinations calculated by calculating unit 22 is equal to or less than a predetermined color difference limit and the sum of the differences between the desired light color and the desired light color for each of the plurality of lighting devices 1 is minimized. This allows instructing unit 23 to instruct a desired light color that is close to the desired light color that person P1 in target space A1 requests from each of the plurality of lighting devices 1. This has the advantages of reducing visual discomfort for person P1 in target space A1 and emitting light that is close to the light color desired by person P1 in target space A1.

[0056] Furthermore, in the lighting system 100 according to this embodiment, the designator 24 designates one of the multiple lighting fixtures 1 as the primary lighting fixture X1 (see FIG. 2 ), and the instructor 23 instructs the primary lighting fixture X1 to set the desired light color for the primary lighting fixture X1 as the designated light color, and instructs each of the remaining lighting fixtures X2 to set the designated light color so that the difference between the desired light colors calculated by the calculator 22 is equal to or less than the color difference limit. This has the advantage of reducing the visual discomfort felt by a person P1 present in the target space A1 when the primary lighting fixture X1 is emitting light of the desired light color, which is the light color that the person P1 present in the target space A1 requests from the primary lighting fixture X1.

[0057] (4) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0058] (4-1) First Modification In the above embodiment, the color difference limit value is set according to the distance between the two lighting fixtures 1, and is set to 1900 K when the distance between the two lighting fixtures 1 is 1 meter or more, and is set to 1100 K when the distance between the two lighting fixtures 1 is less than 1 meter. In contrast, the color difference limit value does not have to be set according to the distance between the two lighting fixtures 1.

[0059] For example, the color difference limit may be set to 1900 K. As shown in graph G1 of FIG. 3 , experiments have shown that when the percentage of people who find the difference in color of light emitted by two lighting fixtures 1 uncomfortable is 50%, the color temperature difference D1 between the colors of the light emitted by the two lighting fixtures 1 is 1857 K. Furthermore, experiments have shown that when the color temperature difference D1 between the colors of the light emitted by the two lighting fixtures 1 exceeds 1857 K, the rate at which people who find the difference in color of the light uncomfortable decreases. Furthermore, when the color difference limit is set to 1900 K, the difference between the desired light color, which is the light color that person P1 in the target space A1 requests from the primary lighting fixture X1, and the indicated light color indicated by the indicator 23 becomes smaller. This has the advantage of minimizing the visual discomfort of person P1 in the target space A1 while emitting light that is close to the light color desired by person P1 in the target space A1.

[0060] Alternatively, the color difference limit may be set to 1100 K. As shown in graph G1 in Figure 3, experiments have shown that when the percentage of people who find differences in light color uncomfortable is 20%, the color temperature difference D2 between the light colors emitted by the two lighting fixtures 1 is 1100 K. Therefore, setting the color difference limit to 1100 K has the advantage of preventing the percentage of people P1 in the target space A1 who find visual discomfort from exceeding 20%.

[0061] Alternatively, the color difference limit may be set to 400 K. FIG. 4 shows graph G2, which illustrates the relationship between the color (color temperature) of the light emitted by each of the two lighting devices 1 and the percentage of people who noticed the difference in color. Experiments have shown that, as shown in graph G2 of FIG. 4, when the percentage of people who noticed the difference in color of the light is 50%, the color temperature difference D3 between the color of the light emitted by each of the two lighting devices 1 is 405 K. Therefore, setting the color difference limit to 400 K has the advantage of preventing the percentage of people P1 present in the target space A1 who noticed the difference in color of the light from exceeding 50%. In other words, this has the advantage of further reducing the visual discomfort felt by people P1 present in the target space A1.

[0062] The color difference limit may be set so that the color of light emitted by each of two lighting fixtures 1 in a combination falls within at least one of three light source color categories defined by JIS Z9112, which are arranged in order of correlated color temperature. In the present disclosure, the "light source color category" refers to the five light source color categories defined by JIS Z9112: daylight, natural white, white, warm white, and warm white. The five categories of daylight, natural white, white, warm white, and warm white, in descending order of correlated color temperature, are listed. That is, the category with the highest correlated color temperature is daylight, and the category with the lowest correlated color temperature is warm white. For example, the color difference limit may be set so that the color of light emitted by each of two lighting fixtures 1 in a combination falls within at least one of daylight, natural white, and white in the light source color categories. The color difference limit value may be set so that the color of light emitted by each of two lighting devices 1 in a combination falls within at least one of daylight white, white, and warm white in the above-mentioned light source color categories. The color difference limit value may be set so that the color of light emitted by each of two lighting devices 1 in a combination falls within at least one of white, warm white, and warm white in the above-mentioned light source color categories. This configuration has the advantage of being able to emit light that is close to the color desired by person P1 in target space A1.

[0063] Specifically, if target space A1 is a living room in a residential facility, it is assumed that a person P1 working or studying (e.g., person P1c shown in FIG. 2) will request that lighting fixture 1 emit daylight or neutral white light. A person P1 watching television will request that lighting fixture 1 emit white light. A person P1 engaging in light exercise (e.g., person P1a shown in FIG. 2) will request that lighting fixture 1 emit white or warm white light. A person P1 reading (e.g., person P1b shown in FIG. 2) will request that lighting fixture 1 emit warm white or warm white light.

[0064] Furthermore, if target space A1 is a dining room in a residential facility, it is assumed that person P1 having a meal will request that lighting fixture 1 emit warm white or incandescent light. Furthermore, if target space A1 is a kitchen in a residential facility, it is assumed that person P1 having a meal will request that lighting fixture 1 emit daylight, cool white, or white light.

[0065] If target space A1 is an office in an office building, it is assumed that person P1 doing office work will request daylight white light as the light color emitted by lighting fixture 1. It is also assumed that person P1 having a meeting will request white or warm white light as the light color emitted by lighting fixture 1, and person P1 taking a break will request warm white or warm white light as the light color emitted by lighting fixture 1.

[0066] (4-2) Second Modification In the above-described embodiment, the instructing unit 23 instructs the primary lighting fixture X1 to set the desired light color for the primary lighting fixture X1 as the instruction light color, and instructs each of the remaining lighting fixtures X2 to set an instruction light color such that the difference between the desired light colors calculated by the calculation unit 22 is equal to or less than the color difference limit. Alternatively, for a combination of two adjacent lighting fixtures 1 in the target space A1, the instructing unit 23 may instruct each of the two lighting fixtures 1 to set an instruction light color, which is the light color of light that each of the two lighting fixtures 1 should emit, such that the difference between the desired light colors calculated by the calculation unit 22 is equal to or less than the predetermined color difference limit. In other words, the two lighting fixtures 1 in a combination that are the target of the instructing unit 23 may be installed adjacent to each other in the target space A1. A lighting system 100 according to a second modification will now be described.

[0067] In lighting system 100 according to the second modification, when the desired light colors of the multiple lighting fixtures 1 are different, calculation unit 22 calculates the difference in the desired light colors for each of multiple combinations of two lighting fixtures 1 that are installed adjacent to each other in target space A1. Then, instruction unit 23 instructs each of the two lighting fixtures 1 that are installed adjacent to each other in target space A1 on the instruction light color, which is the light color of light that each of the two lighting fixtures 1 should emit, so that the difference in the desired light colors calculated by calculation unit 22 is equal to or less than a predetermined color difference limit value.

[0068] With the above configuration, lighting system 100 according to the second modification can further reduce visual discomfort felt by person P1 present in target space A1 by having two lighting devices 1 installed adjacent to each other in target space A1 emit light whose difference in light color is equal to or less than the color difference threshold (i.e., light whose difference in light color is small). In other words, lighting system 100 according to the present embodiment has the advantage of further reducing visual discomfort felt by person P1 present in target space A1.

[0069] Note that lighting system 100 according to the second modification does not necessarily have to include designation unit 24 that designates one of the lighting fixtures 1 as main lighting fixture X1.

[0070] (4-3) Third Modification In the above-described embodiment, the instructing unit 23 instructs the primary lighting fixture X1 to set the desired light color for the primary lighting fixture X1 as the instruction light color, and instructs each of the remaining lighting fixtures X2 to set an instruction light color such that the difference between the desired light colors calculated by the calculating unit 22 is equal to or less than the color difference limit. Alternatively, as shown in FIG. 5 , the multiple lighting fixtures 1 may include one or more first lighting fixtures Y1 that are turned off and one or more second lighting fixtures Y2 that are turned on and are different from the one or more first lighting fixtures Y1. The instructing unit 23 may instruct at least one of the one or more first lighting fixtures Y1 and one or more second lighting fixtures Y2 to set an instruction light color so that the instruction light color changes gradually when the one or more first lighting fixtures Y1 are turned on. A lighting system 100 according to a third modification will now be described.

[0071] In the lighting system 100 according to the third variant, when one or more first lighting fixtures Y1 are turned on, if the first desired light color, which is the desired light color for each of the one or more first lighting fixtures Y1, is different from the second desired light color, which is the desired light color for each of the one or more second lighting fixtures Y2, the calculation unit 22 calculates the difference between the first desired light color and the second desired light color for the combination of each of the one or more first lighting fixtures Y1 and each of the one or more second lighting fixtures Y2.

[0072] If the difference between the first desired light color and the second desired light color exceeds the color difference limit, the instructing unit 23 instructs each of the one or more first lighting devices Y1 to use the first desired light color as the instruction light color during a first period immediately after the one or more first lighting devices Y1 are turned on. Similarly, the instructing unit 23 instructs each of the one or more second lighting devices Y2 to use the second desired light color as the instruction light color during the first period. In other words, the instructing unit 23 does not adjust the light color of the light emitted by each of the one or more first lighting devices Y1 and each of the one or more second lighting devices Y2. The length of each of the first periods is, for example, 10 to 30 seconds.

[0073] Then, during a second period after the first period has elapsed, the instructing unit 23 gradually changes the instructed light color for at least one of the one or more first lighting devices Y1 and one or more second lighting devices Y2 so that the difference between the first desired light color and the second desired light color calculated by the calculating unit 22 is equal to or less than the color difference limit. That is, during a second period after the first period has elapsed, the instructing unit 23 gradually adjusts the light color of the light emitted by at least one of the one or more first lighting devices Y1 and one or more second lighting devices Y2. The length of the second period is, for example, 10 to 30 seconds. This configuration has the advantage of reducing the visual discomfort of the person P1 in the target space A1 without the person P1 noticing.

[0074] During the second period, the indicator 23 preferably changes the indicator light color for each of the one or more first lighting devices Y1 in a stepwise manner so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit. This configuration has the advantage that, when the one or more first lighting devices Y1 are turned on, the visual discomfort experienced by the person P1 in the target space A1 can be reduced without changing the light color of the light emitted by the one or more second lighting devices Y2 that are already turned on.

[0075] The speed at which the indicator 23 gradually changes the indicator light color is less than 100K per second. This configuration has the advantage of preventing the person P1 present in the target space A1 from feeling uncomfortable due to the gradually changing light color of the light emitted by at least one of each of the one or more first lighting devices Y1 and each of the one or more second lighting devices Y2.

[0076] Note that lighting system 100 according to the third modification does not necessarily have to include designation unit 24 that designates one of the plurality of lighting fixtures 1 as main lighting fixture X1.

[0077] (4-4) Fourth Modification In the above-described embodiment, the instructing unit 23 instructs the primary lighting fixture X1 to set the desired light color for the primary lighting fixture X1 as the desired light color, and instructs each of the remaining lighting fixtures X2 to set a desired light color so that the difference between the desired light colors calculated by the calculating unit 22 is equal to or less than the color difference limit. Alternatively, the multiple lighting fixtures 1 may include one or more first lighting fixtures Y1 that are turned on and one or more second lighting fixtures Y2 that are turned on and different from the one or more first lighting fixtures Y1. When the acquiring unit 21 acquires that the first desired light color, which is the desired light color for each of the one or more first lighting fixtures Y1, has been changed, the instructing unit 23 may instruct at least one of the one or more first lighting fixtures Y1 and the one or more second lighting fixtures Y2 to change the desired light color in a stepwise manner. A lighting system 100 according to a fourth modification will now be described.

[0078] In the lighting system 100 according to the fourth modification, when the acquisition unit 21 acquires information that the first desired light color for each of one or more first lighting fixtures Y1 has been changed and the changed first desired light color differs from the second desired light color for each of one or more second lighting fixtures Y2, the calculation unit 22 calculates the difference between the first desired light color and the second desired light color for each of the combinations of one or more first lighting fixtures Y1 and one or more second lighting fixtures Y2. Here, "when the acquisition unit 21 acquires information that the first desired light color for each of one or more first lighting fixtures Y1 has been changed" refers to when the operation unit 31 of the operation terminal 3 corresponding to each of the one or more first lighting fixtures Y1 accepts an operation to change the first desired light color. More specifically, "when the acquisition unit 21 acquires that the first desired light color, which is the desired light color for each of one or more first lighting fixtures Y1, has been changed" means when the communication unit 25 of the adjustment device 2 receives desired light color information I2 indicating that the first desired light color has been changed from the communication unit 34 of the operation terminal 3 corresponding to each of one or more first lighting fixtures Y1 via the communication unit 13 of one or more first lighting fixtures Y1, and the communication unit 25 outputs the received desired light color information I2 to the acquisition unit 21.

[0079] If the difference between the first desired light color and the second desired light color exceeds the color difference limit, the instructing unit 23 instructs each of the one or more first lighting devices Y1 to use the first desired light color as the instruction light color during a first period immediately after the one or more first lighting devices Y1 are turned on. Similarly, the instructing unit 23 instructs each of the one or more second lighting devices Y2 to use the second desired light color as the instruction light color during the first period. That is, the instructing unit 23 does not adjust the light color of the light emitted by each of the one or more first lighting devices Y1 and each of the one or more second lighting devices Y2. Then, during a second period after the first period has elapsed, the instructing unit 23 gradually changes the instruction light color for at least one of the one or more first lighting devices Y1 and one or more second lighting devices Y2 so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit. That is, during a second period after the first period has elapsed, the instructing unit 23 gradually adjusts the color of the light emitted by at least one of the one or more first lighting devices Y1 and one or more second lighting devices Y2. The length of each of the first and second periods is, for example, 10 to 30 seconds. This configuration has the advantage of reducing the visual discomfort felt by the person P1 in the target space A1 without the person P1 noticing.

[0080] During the second period, the indicator 23 preferably changes the indicator light color for each of the one or more first lighting devices Y1 in a stepwise manner so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit. This configuration has the advantage that, when the one or more first lighting devices Y1 are turned on, the visual discomfort experienced by the person P1 in the target space A1 can be reduced without changing the light color of the light emitted by the one or more second lighting devices Y2 that are already turned on.

[0081] The speed at which the indicator 23 gradually changes the indicator light color is less than 100K per second. This configuration has the advantage of preventing the person P1 present in the target space A1 from feeling uncomfortable due to the gradually changing light color of the light emitted by at least one of each of the one or more first lighting devices Y1 and each of the one or more second lighting devices Y2.

[0082] Note that lighting system 100 according to the fourth modification does not necessarily have to include designation unit 24 that designates one of the plurality of lighting fixtures 1 as main lighting fixture X1.

[0083] (4-5) Other variations Other variations are listed below.

[0084] The lighting system 100 of the present disclosure includes a computer system. The computer system is primarily composed of a processor and a memory as hardware. The functions of the lighting system 100 of the present disclosure are realized by the processor executing a program stored in the memory of the computer system. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium readable by the computer system, such as a memory card, an optical disk, or a hard disk drive. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmable after the LSI is manufactured, or logic devices that allow the reconfiguration of internal connections or internal circuit partitions of the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0085] It is not essential for the adjustment device 2 that the multiple functions (acquisition unit 21, calculation unit 22, instruction unit 23, and designation unit 24) are integrated into one housing, and the components of the adjustment device 2 may be distributed across multiple housings. Furthermore, at least some of the functions of the adjustment device 2 may be realized by the cloud (cloud computing) or the like.

[0086] In the above embodiment, adjustment device 2 is provided separately from each of the plurality of lighting fixtures 1, but it may be provided integrally with at least one of the plurality of lighting fixtures 1. That is, at least one of the plurality of lighting fixtures 1 may have acquisition unit 21, calculation unit 22, instruction unit 23, and designation unit 24.

[0087] Similarly, in the above embodiment, the adjustment device 2 is provided separately from each of the multiple operation terminals 3, but it may be provided integrally with at least one of the multiple operation terminals 3. That is, at least one of the multiple operation terminals 3 may have the acquisition unit 21, the calculation unit 22, the instruction unit 23, and the designation unit 24.

[0088] In the above-described embodiment, the communication unit 13 in each lighting fixture 1 and the communication unit 34 of the operation terminal 3 corresponding to the lighting fixture 1 are configured to be capable of wireless communication, but they may also be configured to be capable of wired communication.

[0089] Similarly, in the above-described embodiment, the communication unit 13 in each lighting fixture 1 and the communication unit 25 of the adjustment device 2 are configured to be capable of wireless communication, but they may also be configured to be capable of wired communication.

[0090] In the above-described embodiment, the designator 24 designates one of the plurality of lighting fixtures 1 as the primary lighting fixture X1. However, the designator 24 may designate the lighting fixture 1 with the largest luminous flux as the primary lighting fixture X1. In the present disclosure, "output luminous flux" refers to the amount of light emitted (output) per unit time by each of the plurality of lighting fixtures 1. This configuration has the advantage of reducing the visual discomfort felt by the person P1 present in the target space A1 when the primary lighting fixture X1 emits light of a desired color, which is the light color desired by the person P1 present in the target space A1, from the primary lighting fixture X1 with the largest luminous flux.

[0091] Alternatively, the designator 24 may designate the lighting fixture 1 with the largest luminous intensity distribution angle among the plurality of lighting fixtures 1 as the primary lighting fixture X1. In this disclosure, the "luminous intensity distribution angle" refers to the spread of light emitted by each of the plurality of lighting fixtures 1. The larger the luminous intensity distribution angle, the wider the area of ​​light that is emitted. This configuration has the advantage of reducing the visual discomfort felt by person P1 present in the target space A1 when the primary lighting fixture X1 emits light of a desired light color, which is the light color desired by person P1 present in the target space A1, from the primary lighting fixture X1 with the largest luminous intensity distribution angle.

[0092] The adjustment device 2 may also have a memory unit that stores multiple scenes to which any one of the multiple lighting fixtures 1 is linked, and the designation unit 24 may designate the lighting fixture 1 that is linked to a scene selected by a person P1 present in the target space A1 from the multiple scenes as the main lighting fixture X1.

[0093] In the above-described embodiment, the color difference limit value is set by the color temperature or the correlated color temperature, but it may also be set by the size of an ellipse based on the results of Mac Adam's experiments. As an example, the color difference limit value may be set so as to be within a range of 15 SDCM (standard deviation of color matching) in the Mac Adam's ellipse.

[0094] When multiple lighting devices 1 are under schedule control, instructing unit 23 may prioritize the schedule control, or may interrupt the schedule control and instruct the indicated light color so that the difference in the desired light color calculated by calculation unit 22 is equal to or less than a preset color difference limit value. For example, when multiple lighting devices 1 are under schedule control based on circadian rhythms, instructing unit 23 may be configured to instruct the indicated light color to have a lower color temperature at night.

[0095] In the above-described embodiment, instructing unit 23 instructs each of the two lighting devices 1 in each of the plurality of combinations, but it may also instruct one of the two lighting devices 1 in each of the plurality of combinations. That is, instructing unit 23 may instruct at least one of the two lighting devices 1 in each of the plurality of combinations.

[0096] In the above embodiment, the lighting system 100 includes a plurality of operation terminals 3. However, the lighting system 100 may include only one operation terminal 3. In this case, the operation terminal 3 accepts operations by the person P1 on each of the plurality of lighting devices 1.

[0097] In the above-described embodiment, each of the multiple operation terminals 3 is a remote control device, but it may also be a wearable device such as a smartphone, tablet computer, or smartwatch owned by each of the multiple people P1 present in the target space A1 of the facility.

[0098] In the above-described embodiment, the desired light color received by the operation unit 31 is a color temperature or correlated color temperature value of the light color that the user is requested to emit from the corresponding lighting device 1. However, the desired light color received by the operation unit 31 may also be a term (e.g., "refreshing color," "warm color," etc.) that represents a light color associated with a preset color temperature or correlated color temperature range.

[0099] (summary) A lighting system (100) of a first aspect includes a plurality of lighting fixtures (1), an acquisition unit (21), a calculation unit (22), and an instruction unit (23). Each of the plurality of lighting fixtures (1) emits light into a corresponding area (E1) of the same target space (A1). The acquisition unit (21) acquires a desired light color, which is the light color of light requested to be emitted by each of the plurality of lighting fixtures (1), for each of the plurality of lighting fixtures (1). If the desired light colors of the plurality of lighting fixtures (1) are different, the calculation unit (22) calculates the difference in the desired light color between any two of the plurality of lighting fixtures (1). The instruction unit (23) instructs at least one of the two lighting fixtures (1) on the designated light color, which is the light color of light that each of the two lighting fixtures (1) should emit, so that the difference in the desired light color is equal to or less than a predetermined color difference limit value.

[0100] This embodiment has the advantage of reducing the visual discomfort felt by people present in the target space (A1).

[0101] In the lighting system (100) of the second embodiment, the calculation unit (22) calculates the difference in the desired light color in color temperature or correlated color temperature in the first embodiment. The color difference limit value is set to 1900K.

[0102] This embodiment has the advantage of minimizing the visual discomfort felt by people in the target space (A1) and emitting light that is close to the light color desired by people in the target space (A1).

[0103] In the lighting system (100) of the third embodiment, the calculation unit (22) calculates the difference in the desired light color in color temperature or correlated color temperature in the first embodiment. The color difference limit value is set to 1100K.

[0104] This embodiment has the advantage that the percentage of people who feel visual discomfort among a plurality of people present in the target space (A1) can be prevented from exceeding 20%.

[0105] In the lighting system (100) of the fourth embodiment, the calculation unit (22) calculates the difference in the desired light color in color temperature or correlated color temperature in the first embodiment. The color difference limit value is set to 400K.

[0106] This embodiment has the advantage of being able to further reduce the visual discomfort felt by people present in the target space (A1).

[0107] In the lighting system (100) of the fifth aspect, in the first aspect, the color difference limit value is set so that the light color of the light emitted by each of the two lighting devices (1) is included in at least one of the three categories of light source color defined in JIS Z9112, which are arranged in order of correlated color temperature.

[0108] This embodiment has the advantage that it is possible to irradiate light with a color close to that desired by people present in the target space (A1).

[0109] In the lighting system (100) of the sixth embodiment, the color difference limit value is set according to the distance between the two lighting fixtures (1) in the first embodiment.

[0110] This embodiment has the advantage of effectively reducing the visual discomfort felt by people present in the target space (A1).

[0111] In the lighting system (100) of the seventh aspect, the calculation unit (22) calculates the difference in the desired light color in color temperature or correlated color temperature in the sixth aspect. The color difference limit value is set to 1900K when the distance is 1m or more, and 1100K when the distance is less than 1m.

[0112] This embodiment has the advantage of effectively reducing the visual discomfort felt by people in the target space (A1) and emitting light that is close to the light color desired by people in the target space (A1).

[0113] In an eighth aspect of the lighting system (100), in any one of the first to seventh aspects, the calculation unit (22) calculates the difference in the desired light color for each of the plurality of combinations. The instruction unit (23) instructs at least one of the two lighting devices (1) in each of the plurality of combinations to use an instruction light color such that the difference in the desired light color for each of the plurality of combinations is equal to or less than the color difference limit value and the sum of the differences between the desired light color and the instruction light color for each of the plurality of lighting devices (1) is minimized.

[0114] This embodiment has the advantage of reducing the visual discomfort felt by people in the target space (A1) and emitting light that is close to the light color desired by people in the target space (A1).

[0115] The lighting system (100) of a ninth aspect is any one of the first to eighth aspects, and further includes a designation unit (24) that designates one of the plurality of lighting fixtures (1) as a primary lighting fixture (X1). When the desired light colors of the plurality of lighting fixtures (1) are different, the calculation unit (22) calculates the difference in the desired light color between the primary lighting fixture (X1) and each of the remaining lighting fixtures (X2) that are different from the primary lighting fixture (X1) among the plurality of lighting fixtures (1). The instruction unit (23) instructs the primary lighting fixture (X1) to use the desired light color of the primary lighting fixture (X1) as the instruction light color. The instruction unit (23) instructs each of the remaining lighting fixtures (X2) to use an instruction light color such that the difference in the desired light color of the combination is equal to or less than the color difference limit value.

[0116] This aspect has the advantage of reducing the visual discomfort felt by people in the target space (A1) when the main lighting fixture (X1) emits light of the desired light color, which is the light color that people in the target space (A1) desire from the main lighting fixture (X1).

[0117] A lighting system (100) of a tenth aspect is the lighting system of any one of the first to eighth aspects, further comprising a designation unit (24) that designates a lighting fixture (1) among the plurality of lighting fixtures (1) that has the largest output luminous flux as a primary lighting fixture (X1). When the desired light colors of the plurality of lighting fixtures (1) are different, a calculation unit (22) calculates the difference in desired light color between the primary lighting fixture (X1) and each of the remaining lighting fixtures (X2) among the plurality of lighting fixtures (1) that is different from the primary lighting fixture (X1). An instruction unit (23) instructs the primary lighting fixture (X1) to use the desired light color of the primary lighting fixture (X1) as a designated light color. The instruction unit (23) instructs each of the remaining lighting fixtures (X2) to use a designated light color such that the difference in desired light color between the combinations is equal to or less than the color difference limit value.

[0118] According to this aspect, there is an advantage that the visual discomfort of people present in the target space (A1) can be reduced when the main lighting device (X1) emits light of the desired light color, which is the light color desired by people present in the target space (A1) for the main lighting device (X1) with the maximum output luminous flux.

[0119] An eleventh aspect of the lighting system (100) is the same as any one of the first to eighth aspects, further comprising a designation unit (24) that designates a lighting fixture (1) among the plurality of lighting fixtures (1) that has the largest luminous intensity distribution angle as a primary lighting fixture (X1). When the desired light colors of the plurality of lighting fixtures (1) are different, a calculation unit (22) calculates the difference in desired light color between the primary lighting fixture (X1) and each of the remaining lighting fixtures (X2) among the plurality of lighting fixtures (1) that is different from the primary lighting fixture (X1). An instruction unit (23) instructs the primary lighting fixture (X1) to use the desired light color of the primary lighting fixture (X1) as a designated light color. The instruction unit (23) instructs each of the remaining lighting fixtures (X2) to use a designated light color such that the difference in desired light color between the combinations is equal to or less than the color difference limit value.

[0120] According to this aspect, there is an advantage that the visual discomfort felt by people present in the target space (A1) can be reduced when the main lighting fixture (X1) emits light of the desired light color, which is the light color desired by people present in the target space (A1) for the main lighting fixture (X1) with the largest light distribution angle.

[0121] In the lighting system (100) of the twelfth aspect, in any one of the first to eighth aspects, the two lighting fixtures (1) are installed adjacent to each other in the target space (A1).

[0122] This embodiment has the advantage of being able to further reduce the visual discomfort felt by people present in the target space (A1).

[0123] In a lighting system (100) of a thirteenth aspect, in any of the first to eighth aspects, the plurality of lighting fixtures (1) include one or more first lighting fixtures (Y1) that are turned off and one or more second lighting fixtures (Y2) that are different from the one or more first lighting fixtures (Y1) that are turned on. When the one or more first lighting fixtures (Y1) are turned on, if a first desired light color that is a desired light color for each of the one or more first lighting fixtures (Y1) differs from a second desired light color that is a desired light color for each of the one or more second lighting fixtures (Y2), the calculation unit (22) calculates a difference between the first desired light color and the second desired light color for each of the one or more first lighting fixtures (Y1) and each of the one or more second lighting fixtures (Y2). When the difference between the first desired light color and the second desired light color exceeds the color difference limit, the indicator (23) indicates the first desired light color as the indicator light color for each of the one or more first lighting devices (Y1) during a first period immediately after the one or more first lighting devices (Y1) are turned on. During a second period after the first period has elapsed, the indicator (23) gradually changes the indicator light color for at least one of the one or more first lighting devices (Y1) and the one or more second lighting devices (Y2) so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit.

[0124] This embodiment has the advantage that it is possible to reduce the visual discomfort felt by people present in the target space (A1) without them noticing.

[0125] In the lighting system (100) of the 14th aspect, in the 13th aspect, the indicator (23) gradually changes the indicator light color for each of the one or more first lighting devices (Y1) during the second period so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit value.

[0126] This embodiment has the advantage that when one or more first lighting devices (Y1) are turned on, the visual discomfort felt by people in the target space (A1) can be reduced without changing the color of light emitted by one or more second lighting devices (Y2) that are already turned on.

[0127] In the lighting system (100) of the fifteenth aspect, in the thirteenth or fourteenth aspect, the speed at which the indicator (23) changes the indicator light color stepwise is less than 100K per second.

[0128] This embodiment has the advantage that it is possible to prevent people present in the target space (A1) from feeling uncomfortable due to the gradual change in light color.

[0129] In a lighting system (100) of a sixteenth aspect, in any of the first to eighth aspects, the plurality of lighting fixtures (1) include one or more first lighting fixtures (Y1) that are turned on and one or more second lighting fixtures (Y2) that are different from the one or more first lighting fixtures (Y1) that are also turned on. When the acquisition unit (21) acquires that the first desired light color that is the desired light color for each of the one or more first lighting fixtures (Y1) has been changed, if the first desired light color and the second desired light color that is the desired light color for each of the one or more second lighting fixtures (Y2) are different, the calculation unit (22) calculates a difference between the first desired light color and the second desired light color for each of the one or more first lighting fixtures (Y1) and each of the one or more second lighting fixtures (Y2). When the difference between the first desired light color and the second desired light color exceeds the color difference limit, the indicator (23) indicates the first desired light color as the indicator light color for each of the one or more first lighting devices (Y1) during a first period immediately after the first desired light color is changed. During a second period after the first period has elapsed, the indicator (23) gradually changes the indicator light color for at least one of each of the one or more first lighting devices (Y1) and each of the one or more second lighting devices (Y2) so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit.

[0130] This embodiment has the advantage that it is possible to reduce the visual discomfort felt by people present in the target space (A1) without them noticing.

[0131] In the lighting system (100) of the 17th aspect, in the 16th aspect, the indicator (23) gradually changes the indicator light color for each of the one or more first lighting devices (Y1) during the second period so that the difference between the first desired light color and the second desired light color is equal to or less than the color difference limit value.

[0132] This embodiment has the advantage that when one or more first lighting devices (Y1) are turned on, the visual discomfort felt by people in the target space (A1) can be reduced without changing the color of light emitted by one or more second lighting devices (Y2) that are already turned on.

[0133] In the lighting system (100) of the eighteenth aspect, in the sixteenth or seventeenth aspect, the speed at which the indicator (23) changes the indicator light color stepwise is less than 100K per second.

[0134] This embodiment has the advantage that it is possible to prevent people present in the target space (A1) from feeling uncomfortable due to the gradual change in light color. [Explanation of symbols]

[0135] 100 Lighting System 1. Lighting equipment 21 Acquisition Department 22 Calculation section 23 Instruction section 24 Specified part A1 Target space E1 Area X1 Main lighting fixture X2 remaining lighting fixtures Y1 First lighting fixture Y2 Second lighting fixture

Claims

1. a plurality of lighting fixtures each irradiating light onto a corresponding area of ​​the same target space; an acquisition unit that acquires, for each of the plurality of lighting devices, a desired light color that is a light color of the light that is desired to be emitted from each of the plurality of lighting devices; a calculation unit that calculates a difference in the desired light color between any two lighting devices among the plurality of lighting devices when the desired light color is different for each of the plurality of lighting devices; an indicator that indicates to at least one of the two lighting devices an indicator light color, which is the light color of the light that each of the two lighting devices should emit, so that the difference between the desired light colors is equal to or less than a predetermined color difference limit value; Lighting system.

2. The calculation unit calculates the difference in the desired light color in color temperature or correlated color temperature, The color difference limit value is set to 1900K.

10. The lighting system of claim 1.

3. The calculation unit calculates the difference in the desired light color in color temperature or correlated color temperature, The color difference limit value is set to 1100K.

10. The lighting system of claim 1.

4. The calculation unit calculates the difference in the desired light color in color temperature or correlated color temperature, The color difference limit value is set to 400K.

10. The lighting system of claim 1.

5. The color difference limit value is set so that the light color of the light emitted by each of the two lighting devices is included in at least one of three light source color categories defined in JIS Z9112, which are arranged in order of correlated color temperature.

10. The lighting system of claim 1.

6. the color difference limit value is set according to the distance between the two lighting devices; 10. The lighting system of claim 1.

7. The calculation unit calculates the difference in the desired light color in color temperature or correlated color temperature, The color difference limit value is If the distance is 1 m or more, it is set to 1900 K, If the distance is less than 1 m, it is set to 1100 K.

7. The lighting system of claim 6.

8. the calculation unit calculates a difference in the desired light color for each of the plurality of combinations; the instructing unit instructs at least one of the two lighting devices in each of the plurality of combinations to change the indicated light color so that a difference between the desired light color in each of the plurality of combinations is equal to or less than the color difference limit value and a sum of differences between the desired light color and the indicated light color in each of the plurality of lighting devices is minimized.

10. The lighting system of claim 1.

9. a designation unit that designates one of the plurality of lighting fixtures as a main lighting fixture; the calculation unit calculates a difference in the desired light color between the main lighting fixture and each of the remaining lighting fixtures of the plurality of lighting fixtures that is different from the main lighting fixture when the desired light color is different between the main lighting fixture and each of the remaining lighting fixtures of the plurality of lighting fixtures; The instruction unit instructing the primary lighting fixture to use the desired light color of the primary lighting fixture as the indicated light color; and instructing each of the remaining lighting devices to change the indicated light color so that the difference between the desired light colors in the combination is equal to or less than the color difference limit value.

10. The lighting system of claim 1.

10. a designation unit that designates a lighting fixture having the largest output luminous flux among the plurality of lighting fixtures as a primary lighting fixture; the calculation unit calculates a difference in the desired light color between the main lighting fixture and each of the remaining lighting fixtures of the plurality of lighting fixtures that is different from the main lighting fixture when the desired light color is different between the main lighting fixture and each of the remaining lighting fixtures of the plurality of lighting fixtures; The instruction unit instructing the primary lighting fixture to use the desired light color of the primary lighting fixture as the indicated light color; and instructing each of the remaining lighting devices to change the indicated light color so that the difference between the desired light colors in the combination is equal to or less than the color difference limit value.

10. The lighting system of claim 1.

11. a designation unit that designates a lighting fixture having a maximum luminous intensity distribution angle among the plurality of lighting fixtures as a primary lighting fixture; the calculation unit calculates a difference in the desired light color between the main lighting fixture and each of the remaining lighting fixtures of the plurality of lighting fixtures that is different from the main lighting fixture when the desired light color is different between the main lighting fixture and each of the remaining lighting fixtures of the plurality of lighting fixtures; The instruction unit instructing the primary lighting fixture to use the desired light color of the primary lighting fixture as the indicated light color; and instructing each of the remaining lighting devices to change the indicated light color so that the difference between the desired light colors in the combination is equal to or less than the color difference limit value.

10. The lighting system of claim 1.

12. The two lighting fixtures are installed adjacent to each other in the target space.

10. The lighting system of claim 1.

13. The plurality of lighting fixtures include: one or more first lighting fixtures that are turned off; one or more second lighting fixtures that are different from the one or more first lighting fixtures and are turned on; the calculation unit, when the one or more first lighting fixtures are turned on, calculates a difference between a first desired light color that is the desired light color for each of the one or more first lighting fixtures and a second desired light color that is the desired light color for each of the one or more second lighting fixtures, and When the difference between the first desired light color and the second desired light color exceeds the color difference limit value, during a first time period immediately after the one or more first lighting devices are turned on, instructing each of the one or more first lighting devices to use the first desired light color as the instruction light color; during a second period after the first period has elapsed, the indicator light color is changed stepwise for at least one of the one or more first lighting devices and the one or more second lighting devices so that a difference between the first desired light color and the second desired light color is equal to or less than the color difference limit value; 10. The lighting system of claim 1.

14. the indicator, during the second time period, changes the indicator light color stepwise for each of the one or more first lighting devices so that a difference between the first desired light color and the second desired light color is equal to or less than the color difference limit value; 14. The lighting system of claim 13.

15. The speed at which the indicator changes the indicator light color stepwise is less than 100K per second.

15. A lighting system according to claim 13 or 14.

16. The plurality of lighting fixtures include: one or more first lighting fixtures in an on state; one or more second lighting devices that are different from the one or more first lighting devices and are in a lit state; the calculation unit, when the acquisition unit acquires that a first desired light color, which is the desired light color for each of the one or more first lighting devices, has been changed, calculates a difference between the first desired light color and the second desired light color for the combination of each of the one or more first lighting devices and each of the one or more second lighting devices if the first desired light color is different from a second desired light color, which is the desired light color for each of the one or more second lighting devices; When the difference between the first desired light color and the second desired light color exceeds the color difference limit value, In a first period immediately after the first desired light color is changed, instruct each of the one or more first lighting devices to use the first desired light color as the instruction light color; during a second period after the first period has elapsed, the indicator light color is changed stepwise for at least one of the one or more first lighting devices and the one or more second lighting devices so that a difference between the first desired light color and the second desired light color is equal to or less than the color difference limit value; 10. The lighting system of claim 1.

17. the indicator, during the second time period, changes the indicator light color stepwise for each of the one or more first lighting devices so that a difference between the first desired light color and the second desired light color is equal to or less than the color difference limit value; 17. The lighting system of claim 16.

18. The speed at which the indicator changes the indicator light color stepwise is less than 100K per second.

18. A lighting system according to claim 16 or 17.

Images