Lighting system, lighting fixture and lighting control device

Abstract

To obtain a lighting system, a luminaire, and a lighting control device that can adjust the user's biorhythm.SOLUTION: A lighting system according to the present disclosure includes a plurality of light sources having different emission spectra, and a controller that controls outputs of the plurality of light sources, and the controller reduces the equivalent melanopic illuminance obtained from the plurality of light sources over time from morning to night.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a lighting system, a lighting fixture, and a lighting control device. [Background technology]

[0002] Patent Document 1 discloses a lighting control device that adjusts the correlated color temperature of a lighting load installed in a specified space and adjusts the illuminance of the specified space by adjusting the light output of the lighting load. This lighting control device adjusts the correlated color temperature of the lighting load to a first correlated color temperature and adjusts the illuminance of the specified space to a first illuminance during a first time slot from a specified time in the morning to around noon. The lighting control device also reduces the correlated color temperature of the lighting load from the first correlated color temperature to a second correlated color temperature over time during a second time slot in the afternoon, which is set after the first time slot. Furthermore, the lighting control device reduces the illuminance of the specified space from a first illuminance to a second illuminance over time during the second time slot. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5895193 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 specifies the preferred color temperature and illuminance to be ensured for each time period, taking into account melatonin secretion. However, in recent years, light-emitting devices have been released that emit wavelengths that contribute significantly to suppressing melatonin secretion, even at low color temperatures. Therefore, lighting control that assumes correlated color temperature and the illuminance to be ensured, as in Patent Document 1, may not be able to provide a lighting environment that is favorable for biological rhythms.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a lighting system, lighting fixture, and lighting control device that can regulate the user's biological rhythm. [Means for solving the problem]

[0006] The lighting system according to the present disclosure includes a plurality of light sources having different emission spectra, and a controller that controls the outputs of the plurality of light sources to vary the equivalent melanopic illuminance obtained from the plurality of light sources, and the controller reduces the equivalent melanopic illuminance obtained from the plurality of light sources over time from morning to night. The equivalent melanopic irradiance is controlled according to a curve whose state changes smoothly over time, with an inflection point as a boundary. do.

[0007] The lighting device according to the present disclosure includes a plurality of light sources having different emission spectra, a lighting circuit that turns on the plurality of light sources, and a control unit that controls the lighting circuit, and the control unit controls the lighting circuit so as to reduce the equivalent melanopic illuminance obtained from the plurality of light sources as time passes from morning to night. The equivalent melanopic irradiance is controlled according to a curve whose state changes smoothly over time with an inflection point as a boundary. do.

[0008] The lighting control device according to the present disclosure includes a control unit that reduces the equivalent melanopic illuminance obtained from a plurality of light sources having different emission spectra over time from morning to night. The equivalent melanopic irradiance is controlled according to a curve whose state changes smoothly over time, with an inflection point as a boundary. do. [Effects of the Invention]

[0009] In the lighting system, lighting fixture, and lighting control device according to the present disclosure, the equivalent melanopic illuminance obtained from the multiple light sources decreases over time from morning to night, thereby regulating the user's biological rhythm. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 shows circadian response and luminosity response curves. [Figure 2] 1 is a diagram showing a lighting system according to a first embodiment. [Figure 3] 1 is a block diagram showing a lighting system according to a first embodiment. [Figure 4] 1 is a block diagram showing a lighting fixture according to a first embodiment. [Figure 5] FIG. 10 is a diagram showing an example of the change in equivalent melanopic illuminance over time. [Figure 6] FIG. 10 is a diagram showing an example of the change in equivalent melanopic illuminance over time. [Figure 7] FIG. 10 is a diagram showing an example of the change in equivalent melanopic illuminance over time. [Figure 8] FIG. 10 is a diagram illustrating an example of initial settings. [Figure 9] FIG. 10 is a diagram showing an example of setting equivalent melanopic irradiance. [Figure 10] FIG. 10 is a diagram showing the state in which the time variation of equivalent melanopic illuminance is displayed on the user interface unit. [Figure 11] FIG. 10 is a diagram illustrating an example of illuminance and color temperature settings. [Figure 12] FIG. 1 is a diagram showing examples of emission spectra of light sources with the same color temperature but different melanopic ratios. DETAILED DESCRIPTION OF THE INVENTION

[0011] A lighting system, lighting fixture, and lighting control device according to the present embodiment will be described with reference to the drawings. The same or corresponding components are designated by the same reference numerals, and repeated description may be omitted. The following embodiments are intended to embody the technical ideas of the present disclosure and are not intended to limit the present disclosure. The sizes and positional relationships of components shown in the drawings may be exaggerated for clarity. The relationship between color names and chromaticity coordinates, the relationship between light wavelength ranges and color names of monochromatic light, and other factors conform to JIS Z8110.

[0012] Embodiment 1 First, let's explain the effect that lighting has on the human body. In recent years, there has been a movement to emphasize the effect that a work environment has on the human body when creating a work environment. One example of this is the WELL certification (Well Building Standard) established by the IWBI (International WELL Building Institute). WELL certification evaluates buildings such as offices based on items such as air, water, food, light, and comfort, and certification is given if they meet the standards.

[0013] The lighting items in WELL certification are evaluated based on consideration of the visual environment, circadian rhythm, consideration of glare from fixtures or sunlight, color rendering, etc. In this way, lighting that illuminates indoor spaces where people work is not only required to have excellent color rendering, but also to take into consideration its impact on the human body.

[0014] Furthermore, the human circadian rhythm is approximately 25 hours long, which is longer than a day. If this is not adjusted to a 24-hour cycle, the rhythm cycle will be out of sync with the day. Light plays an important role as a synchronizing factor for adjusting the rhythm cycle to 24 hours. Exposure to sunlight can adjust a person's internal clock to 24 hours. This allows people to live within a daily rhythm of waking up in the morning and sleeping at night.

[0015] In other words, the human body has a light-based synchronization function that allows it to live on a 24-hour cycle. Specifically, there is a very small region in the hypothalamus of the brain called the suprachiasmatic nucleus. This region acts as the internal clock that controls the circadian rhythm. Furthermore, the cells that send light signals to the suprachiasmatic nucleus are intrinsically photosensitive retinal ganglion cells in the retina. Intrinsically photosensitive retinal ganglion cells are referred to as ipRGCs below.

[0016] ipRGCs contain a photoreceptor protein called melanopsin, which has been shown to be involved in photoentrainment of circadian rhythms. Melanopsin has absorption characteristics that vary depending on the wavelength of light, with its peak at around 480nm to 490nm.

[0017] Melanopsin is also thought to be involved in the secretion or suppression of the sleep-promoting hormone melatonin. For example, increased stimulation of ipRGCs is thought to suppress melatonin secretion. Normally, the body's melatonin secretion peaks at night, and melatonin secretion promotes sleep. Therefore, melatonin secretion is suppressed during the day.

[0018] The WELL certification mentioned above introduces equivalent melanopic lux to evaluate whether a lighting design takes circadian rhythms into consideration. Equivalent melanopic lux will be referred to as EML below. Equivalent melanopic lux (EML) is a quantitative unit of brightness that affects circadian rhythms. EML is calculated by multiplying illuminance by melanopic ratio (Equation (1)). Melanopic ratio (MR) will be referred to below.

[0019] The melanopic ratio MR can be calculated using the following formula (2).

[0020]

number

[0021] In equation (2), Light is the spectral distribution of light from the lighting fixture, Circadian is the circadian response based on the spectral sensitivity characteristics of melanopsin, which has a peak around 480 nm to 490 nm, as described above, and Visual is the luminosity response. Figure 1 shows the curves of the circadian response and the luminosity response. Note that the peak sensitivity of ipRGC is approximately 480 nm. On the other hand, the circadian response shown in Figure 1 has a peak at 490 nm. This is due to the consideration of the crystalline lens of the adult eye, which preferentially transmits light of longer wavelengths.

[0022] 2 is a diagram illustrating lighting system 100 according to the first embodiment. A person working in office space 50 is exposed to illumination light from lighting fixture 40 while sitting in a chair and working at a desk. For this reason, lighting fixture 40 is preferably arranged so as to provide a certain level of illuminance suitable for the work. For example, when general office work is performed in space 50, illumination light is emitted so that the desk illuminance is 500 lx or more, more preferably 750 lx or more.

[0023] These illumination standards vary depending on the purpose or work carried out in a building. For example, standards may differ for offices, factories, schools, commercial facilities, etc. Furthermore, standards may differ depending on the country. For example, Japan has a standard called JIS Z9110.

[0024] The lighting system 100 is a system that provides lighting in a space 50 such as an office room. The space 50 may be a place where multiple users can stay at the same time, such as a lounge or dining room in a welfare facility for the elderly. The space 50 may also be a private place such as a study in one's home.

[0025] The lighting system 100 includes a user interface unit 10, lighting fixtures 40, and a controller 20 that controls the lighting fixtures 40. The controller 20 corresponds to a lighting control device. The lighting system 100 includes multiple lighting fixtures 40, and the controller 20 controls the multiple lighting fixtures 40. As will be described later, the controller 20 controls the output of multiple light sources 45a, 45b in each lighting fixture 40, thereby changing the EML obtained from the multiple light sources 45a, 45b. The lighting control system 100 may include one or more lighting fixtures 40. The controller 20 is installed, for example, on the ceiling of the space 50.

[0026] In addition to the space 50, an office building generally has a control room for managing the office building. The control room is equipped with facilities for managing building facilities such as elevators, air conditioning, and lighting. The controller 20 may be provided in the control room.

[0027] 3 is a block diagram showing a lighting system 100 according to the first embodiment. First, the user interface unit 10 will be described. The user interface unit 10 is, for example, a battery-powered tablet. The user interface unit 10 may be realized by installing a dedicated application on a general-purpose device such as a smartphone or a tablet terminal.

[0028] The user interface unit 10 may be a device operated by a floor manager of a room or the like to control the lighting fixtures 40. The user interface unit 10 may also be a dedicated device for the lighting system 100. In this case, the user interface unit 10 is installed within the space 50. The user interface unit 10 may also be installed in a location other than the space 50.

[0029] The user interface unit 10 includes an operation reception unit 11, a control unit 12, a communication unit 13, a display unit 14, and a storage unit 15.

[0030] The operation reception unit 11 receives operations such as setting operations for setting a schedule, which will be described later, etc. The operation reception unit 11 is realized by a touch panel, hardware buttons, or the like.

[0031] Control unit 12 stores schedule setting information in storage unit 15 based on the setting operation accepted by operation acceptance unit 11. The schedule setting information is transmitted to controller 20 by communication unit 13. Controller 20 controls the lighting fixtures based on the schedule setting information.

[0032] Furthermore, when a start operation is accepted by the operation accepting unit 11, the control unit 12 causes the communication unit 13 to send a start instruction signal. This causes the controller 20 to start the schedule operation. Furthermore, when a stop operation is accepted by the operation accepting unit 11, the control unit 12 causes the communication unit 13 to send a stop instruction signal. This causes the controller 20 to stop the schedule operation. The control unit 12 is realized by, for example, a microcomputer or a processor.

[0033] The communication unit 13 transmits schedule setting information, a start instruction signal, and a stop instruction signal to the controller 20 based on instructions from the control unit 12. Specifically, the communication unit 13 is a communication circuit or a communication module that enables the user interface unit 10 to communicate with the controller 20. The communication performed by the communication unit 13 may be wired communication or wireless communication. There are no particular limitations on the communication standard used for the communication.

[0034] It is not necessary for user interface unit 10 and controller 20 to be in constant communication. Once communication unit 13 sends control commands such as schedule setting information, start instruction signals, or stop instruction signals to controller 20, controller 20 stores the control commands and thereafter controls lighting fixtures 40 in accordance with the control commands.

[0035] The display unit 14 displays a display screen that is visually recognized by the person setting the schedule under the control of the control unit 12. The display unit 14 is realized by, for example, a liquid crystal panel or an organic EL panel.

[0036] The storage unit 15 stores schedule setting information by the control unit 12. The storage unit 15 also stores a control program executed by the control unit 12. When the user interface unit 10 is realized by a general-purpose information terminal such as a smartphone or a tablet terminal, a dedicated application program for operating the general-purpose information terminal as the user interface unit 10 is installed in the storage unit 15. The storage unit 15 is, for example, a semiconductor memory such as a nonvolatile memory.

[0037] Next, the controller 20 will be described. The controller 20 is a lighting control device that controls the output of multiple light sources 45a, 45b of the lighting fixture 40. For example, a commercial power source is supplied to the controller 20. The controller 20 is connected to the lighting fixture 40 wirelessly or via a wire. In response to a control command from the user interface unit 10, the controller 20 transmits a control signal to the lighting fixture 40 to control the output of a lighting circuit 42 (described later). The controller 20 includes communication units 22, 26, a lighting control unit 23, a timer unit 24, and a memory unit 25.

[0038] The communication unit 22 receives schedule setting information, a start instruction signal, and a stop instruction signal transmitted by the user interface unit 10. Specifically, the communication unit 22 is a communication circuit or a communication module that enables the controller 20 to communicate with the user interface unit 10.

[0039] Lighting control unit 23 stores the schedule setting information received by communication unit 22 in storage unit 25. Thereafter, when communication unit 22 receives a start instruction signal, lighting control unit 23 controls the light emission of light source unit 45 of lighting device 40 based on the schedule setting information stored in storage unit 25. As described below, lighting control unit 23 reduces the EML obtained from multiple light sources 45a, 45b over time from morning to night. Lighting control unit 23 controls the EML by controlling at least one of the illuminance and color temperature of the light emitted by lighting device 40 in space 50.

[0040] The lighting control unit 23 is realized by, for example, a processor, a microcomputer, or a dedicated circuit. The schedule setting information is, for example, a time and the EML at that time. The schedule setting information may also be the intensity value or color temperature value of the light emitted by the light source unit 45. The lighting control unit 23 reads out and uses the schedule setting information stored in the storage unit 25.

[0041] Timekeeping unit 24 is a timing device that measures the current time and notifies lighting control unit 23 of the measured time. Timekeeping unit 24 is used by lighting control unit 23 to cause lighting fixtures 40 to emit light in accordance with schedule setting information. Specifically, timekeeping unit 24 is a real-time clock or the like, but may take any form.

[0042] The storage unit 25 is a storage device that stores schedule setting information, etc. The storage unit 25 also stores a control program executed by the lighting control unit 23. The storage unit 25 is, for example, a semiconductor memory such as a nonvolatile memory.

[0043] Communication unit 26 is a communication circuit or communication module that enables controller 20 to communicate with lighting fixtures 40. The communication performed by communication unit 26 may be wired communication or wireless communication. There are no particular limitations on the communication standard used for the communication.

[0044] FIG. 4 is a block diagram showing lighting fixture 40 according to embodiment 1. Lighting fixture 40 includes lighting device 41 and light source unit 45. Lighting fixture 40 is, for example, a base light attached to the ceiling of space 50 to illuminate space 50. Lighting fixture 40 has, for example, a rectangular shape in plan view, but may also have a circular shape in plan view. Lighting fixture 40 may also be a ceiling light, downlight, or spotlight. Lighting device 41 includes lighting circuit 42 that turns on multiple light sources 45a and 45b included in light source unit 45, control unit 43 that controls lighting circuit 42, and communication unit 44 that communicates with the outside.

[0045] The communication unit 44 receives a control signal from the controller 20. The communication unit 44 is a communication circuit or a communication module that enables the lighting fixture 40 to communicate with the controller 20.

[0046] The control unit 43 controls the lighting circuit 42 in response to a control signal received by the communication unit 44. Specifically, the control unit 43 controls the lighting circuit 42 so as to reduce the EML obtained from the plurality of light sources 45a, 45b as time passes from morning to night. The control unit 43 is realized by, for example, a processor, a microcomputer, or a dedicated circuit. The control unit 43 also has a storage unit. The storage unit stores a control program executed by the control unit 43. The storage unit is, for example, a semiconductor memory such as a non-volatile memory.

[0047] The lighting circuit 42 is a power supply circuit that supplies power to light the light source unit 45. The lighting circuit 42 is, for example, a switching circuit.

[0048] The light source unit 45 has multiple light sources 45a, 45b with different emission spectra. While two types of light sources 45a, 45b are shown in FIG. 4, the light source unit 45 may have three or more light sources with different emission spectra. The light sources 45a, 45b emit light with different melanopic ratios MR. The MRs of the light sources 45a, 45b are, for example, 1.2 and 0.4. The light sources 45a, 45b are, for example, LEDs. Each of the light sources 45a, 45b is, for example, an SMD (Surface Mount Device) type light-emitting module that uses an LED as a light-emitting element. Each of the light sources 45a, 45b may also be a COB (Chip On Board) type light-emitting module.

[0049] The control unit 43 can independently control the light emission states of the light sources 45a and 45b via the lighting circuit 42. The light emission states include, for example, color temperature and luminous flux. The control unit 43 can control the EML of the light emitted by the light source unit 45 by controlling the output balance of the light sources 45a and 45b.

[0050] Next, we will explain how to control the EML. The EML can be calculated from the MR and illuminance using equation (1). First, we will explain how to calculate the MR of each light source 45a, 45b. The MR can be calculated from the output of each light source and equation (2). First, the output of each light source is obtained, for example, in 5 nm increments. The output can be obtained from the manufacturer's specifications or measured with a spectrometer. Next, the output of each light source is integrated by the values ​​of the circadian response and luminosity response curves shown in Figure 1 to derive the melanopic response and visual response. Finally, the sum of the melanopic response is divided by the sum of the visual response and integrated with the exponent 1.218.

[0051] The illuminance of each light source is also obtained. As an example of measuring illuminance, measurements are taken in a vertical plane 1.2 m above the floor. This corresponds roughly to the eye level of a seated person. Measurements are also taken at the center of the room. The reflectance of each location is assumed to be 70% for the ceiling, 50% for the walls, and 10% for the floor.

[0052] The MR and illuminance thus obtained are set in advance in, for example, the controller 20. The storage unit 25 of the controller 20 holds information on the MR and illuminance for each of the plurality of light sources 45a, 45b. The lighting control unit 23 uses this information to calculate the EML. The lighting control unit 23 controls the output of the plurality of light sources 45a, 45b using the information on the MR and illuminance so that the EML obtained from the plurality of light sources 45a, 45b matches a setting value input from outside. This setting value is input from the user interface unit 10.

[0053] The light sources 45a and 45b have different MRs. The EML can be controlled by changing the output, i.e., luminous flux, of the light sources 45a and 45b. When controlling the EML of the light source unit 45, the illuminance of the light source unit 45 may be controlled to be constant, or the illuminance of the light source unit 45 may be changed.

[0054] Previous research has shown that exposure to strong light during the day regulates biological rhythms and leads to higher quality sleep at night. Specifically, it is preferable to be exposed to 240 melanopic lux for at least four hours, including between 9:00 a.m. and 1:00 p.m. In WELL certification, an EML of 240 melanopic lux or more for at least four hours, including between 9:00 a.m. and 1:00 p.m., will earn three bonus points, and an EML of 150 melanopic lux or more will earn one bonus point.

[0055] Additionally, according to WELL certification, it is preferable to avoid exposure to high EML light after 8 p.m. Melatonin secretion peaks 14 to 16 hours after exposure to light in the morning. If light is exposed around 6 a.m., 14 hours will have passed by 8 p.m. In this case, exposure to high EML light after 8 p.m. will suppress melatonin secretion and disrupt sleep. By suppressing EML after 8 p.m., melatonin can be secreted and sleep can be promoted, thereby regulating circadian rhythms. Additionally, according to WELL certification, points will be awarded for lighting conditions with high EML during the daytime, with a value of 120 melanopic lux or higher.

[0056] In this embodiment, controller 20 reduces the EML obtained from multiple light sources 45a, 45b over time from morning to night in accordance with an externally input setting value, thereby enabling the user of lighting device 40 to regulate their biological rhythm.

[0057] When the lighting system 100 is used in an office, the controller 20 reduces the EML over time from the start of work to the end of work. It is preferable that the EML be reduced to one-third to one-half over time from the start of work to the end of work. As mentioned above, it is preferable that the EML be 240 melanopic lux or more from 9:00 to 13:00. In an office, it is also acceptable for the EML to be 240 melanopic lux or more from the start of work to 13:00. It is also preferable that the EML be 120 melanopic lux or less from 20:00 onwards.

[0058] 5, 6, and 7 are diagrams showing examples of time-dependent changes in equivalent melanopic illuminance EML. When EML is the equivalent melanopic illuminance, t is time, and c is a constant, the equivalent melanopic illuminance may change according to EML = arctan(t) + c (Equation (3)). The way a space appears changes with a change in color temperature. Therefore, a user accustomed to a certain color temperature may feel uncomfortable when the color temperature changes. In other words, if EML is controlled according to a different line or curve at a specific time, the change in control may cause discomfort to the user. In contrast, in this embodiment, EML is controlled according to an arctangent curve from the start of work to the end of work. This allows the EML to be reduced smoothly and continuously. Therefore, discomfort felt by the user can be reduced.

[0059] Furthermore, the arctangent curve allows the EML to be maintained at or above a predetermined value before a specified time. Furthermore, the arctangent curve also allows the EML to approach the lower limit even after sufficient time has passed. Therefore, it is possible to prevent the EML from falling below the lower limit. This allows the illuminance required by the Industrial Safety and Health Act to be maintained.

[0060] Also, the speed of EML change may be set from the user interface unit 10. Fig. 5 shows a case where EML changes quickly, Fig. 6 shows a case where EML changes slowly, and Fig. 7 shows a case where EML changes moderately.

[0061] 5 to 7, EML setting values ​​are determined for 1:00 PM and 8:00 PM. The controller 20 controls the outputs of the light sources 45a and 45b so that the EML of the light source unit 45 matches the setting value for each of the multiple time periods.

[0062] Furthermore, the EML has an inflection point between 1 PM and 8 PM, for example. The inflection point is the time when x = 0 in equation (3). The time of the inflection point may be input from the user interface unit 10. The inflection point is, for example, 4:30 PM, midway between 1 PM and 8 PM.

[0063] 5 to 7, the lighting system 100 has operation modes corresponding to three time periods. The three time periods are a first time period from morning to early afternoon, a second time period that marks the halfway point of the day, and a third time period from evening to night. Specifically, the first time period is from morning to 1:00 PM, the second time period is a time period that includes an inflection point from 1:00 PM to 8:00 PM, and the third time period is a time period after 8:00 PM.

[0064] Note that the EML may be controlled according to a formula other than formula (3) as long as it can be smoothly controlled. For example, the EML is not limited to an arctangent curve, and may be controlled according to a curve having an inflection point, i.e., a point at which the curve smoothly changes from an upwardly convex state to an upwardly concave state. Furthermore, control may be performed such that the EML is set to a predetermined value or higher from the start of work until a predetermined set time, and then the EML is reduced from the set time to the end of work.

[0065] Next, a description will be given of schedule setting using the user interface unit 10. Figs. 8 to 11 are diagrams showing the state of the display unit 14 of the user interface unit 10. The display unit 14 of this embodiment is a touch panel, and also serves as the operation reception unit 11.

[0066] Fig. 8 is a diagram showing an example of initial setting. The initial setting screen shown in Fig. 8 displays a setting section 14a for inputting information about the MR and illuminance for each of the plurality of light sources 45a and 45b. The illuminance is a measured value when the light sources 45a and 45b are each turned on at a dimming rate of 100%.

[0067] 9 is a diagram showing an example of setting the equivalent melanopic illuminance EML. The display unit 14 is provided with a setting unit 14b for inputting a set value for EML. The display unit 14 is also provided with a setting unit 14c for inputting a turning point time, i.e., an inflection point of the EML. The display unit 14 is also provided with a setting unit 14d for setting the speed of change of the EML. The speed of change of the EML can be selected from three levels: slow, moderate, and fast. The information input from the setting units 14b, 14c, and 14d corresponds to the schedule setting information described above.

[0068] A setting person such as an office floor manager can set a schedule for EML for the three time periods mentioned above using the user interface unit 10. Here, certain restrictions may be set on the values ​​input to the user interface unit 10, taking into account the biorhythms of the people in the room.

[0069] For example, the EML for the first time slot may not be set below 240 melanopic lux. Furthermore, if the EML for the first time slot is set below 240 melanopic lux, the user interface unit 10 may notify the user that the setting is outside the predetermined range by displaying the setting value in red, for example. Similarly, the EML for the third time slot may not be set above 120 melanopic lux. Furthermore, if the EML for the third time slot is set above 120 melanopic lux, the user interface unit 10 may notify the user that the setting is outside the predetermined range by displaying the setting value in red, for example. This can encourage the user to set the setting to improve the biological rhythm of facility users. Furthermore, the initial setting value for the EML for the first time slot may be the value when the dimming rates of the light sources 45a and 45b are both 100%.

[0070] The user interface unit 10 may also have a setting unit for setting whether to prioritize changing the color temperature or the illuminance obtained from the multiple light sources 45 a, 45 b when lowering the EML. When priority is given to the illuminance, the amount of change in the color temperature is suppressed, and when priority is given to the color temperature, the amount of change in the illuminance is suppressed.

[0071] 10 is a diagram showing the time variation of the equivalent melanopic illuminance EML displayed on the user interface unit 10. The display unit 14 may be provided with a control curve display section 14e for checking the set control curve of EML.

[0072] 11 is a diagram showing an example of illuminance and color temperature settings. The user interface unit 10 may have a switching unit 14g for switching between a mode in which the EML is reduced over time and a mode in which the illuminance of the multiple light sources 45a, 45b is controlled to be constant. When the switching unit 14g turns on the EML control, the above-mentioned start instruction signal is sent to the controller 20. This starts the EML schedule control. When the switching unit 14g turns on the constant illuminance control, a stop instruction signal is sent to the controller 20. This starts the constant illuminance control. The display unit 14 also has a setting unit 14f for inputting the illuminance and color temperature in the constant illuminance control.

[0073] FIG. 12 shows an example of the emission spectra of light sources 45a and 45b with the same color temperature but different melanopic ratios MR. The light sources 45a and 45b may have the same color temperature as long as they have different MRs. In the example shown in FIG. 12, the color temperatures of the light sources 45a and 45b are both 5000 K. The MRs of the light sources 45a and 45b are 0.985 and 0.785, respectively, with the MR of the light source 45a being approximately 25% higher than the MR of the light source 45b. The circadian response curves are also shown in FIG. 12.

[0074] In a method of controlling the EML by adjusting the output of multiple light sources with different color temperatures, or a method of controlling the EML by adjusting the color temperature of each light source, the color temperature of the lighting fixture may change, causing the user to feel uncomfortable. In contrast, by using light sources 45a and 45b as shown in Figure 12, the color temperature of light source unit 45 does not change even when the EML is changed. Therefore, the discomfort felt by the user can be reduced.

[0075] The EML lower and upper limits, such as 240 melanopic lux and 120 melanopic lux, mentioned above, are merely examples. Generally, there is no minimum EML limit. However, the minimum illuminance for offices is set by the Industrial Safety and Health Act. The Industrial Safety and Health Act stipulates that the illuminance standard for work surfaces for "ordinary work" is 150 lx or more. Here, the illuminance on the work surface is the horizontal illuminance 0.8 m above the floor. As mentioned above, EML is measured on a vertical surface. Converting the standard established by measuring on a horizontal surface to a vertical surface results in an illuminance of approximately 50 lx. Therefore, EML may be controlled so that the illuminance on a vertical surface is 50 lx or more.

[0076] In the present embodiment, when the lighting system 100 is used in an office, the start time of the EML schedule control is set to the start time of work. However, the start time of the EML schedule control is not limited to this and may be any time as long as it is in the morning.

[0077] In the present embodiment, information on MR and illuminance is stored in memory 25 of controller 20. However, this is not limiting, and information on MR and illuminance may be stored in memory 15 of user interface 10. In this case, user interface 10 may also function as controller 20. Control unit 43 of lighting device 40 may also store information on MR and illuminance. In this case, lighting device 40 may also function as controller 20. Controller 20 may be part of user interface 10 or part of lighting device 40.

[0078] The technical features described in this embodiment may be used in appropriate combination. [Explanation of symbols]

[0079] 10 User interface unit, 11 Operation reception unit, 12 Control unit, 13 Communication unit, 14 Display unit, 14a to 14d Setting unit, 14e Control curve display unit, 14f Setting unit, 14g Switching unit, 15 Memory unit, 20 Controller, 22 Communication unit, 23 Lighting control unit, 24 Timer unit, 25 Memory unit, 26 Communication unit, 40 Lighting fixture, 41 Lighting device, 42 Lighting circuit, 43 Control unit, 44 Communication unit, 45 Light source unit, 45a, 45b Light source, 50 Space, 100 Lighting system

Claims

1. a plurality of light sources having different emission spectra; a controller that controls the output of each of the plurality of light sources to vary the equivalent melanopic illuminance obtained from the plurality of light sources; Equipped with the controller reduces the equivalent melanopic illuminance obtained from the plurality of light sources as time passes from morning to night; 10. A lighting system, characterized in that the equivalent melanopic irradiance is controlled according to a curve whose state changes smoothly over time, with an inflection point as a boundary.

2. 2. The lighting system of claim 1, wherein the equivalent melanopic illuminance varies according to EML=arctan(t)+c, where EML is the equivalent melanopic illuminance, t is time, and c is a constant.

3. 3. The lighting system according to claim 1, wherein the plurality of light sources have the same color temperature.

4. 4. The lighting system according to claim 1, wherein the controller reduces the equivalent melanopic illuminance with time from a work start time to a work finish time.

5. 5. The lighting system according to claim 1, wherein the equivalent melanopic illuminance from 9:00 to 13:00 is 240 melanopic lux or more.

6. 6. The lighting system according to claim 1, wherein the equivalent melanopic illuminance after 8:00 p.m. is 120 melanopic lux or less.

7. 7. The lighting system according to claim 1, wherein the equivalent melanopic irradiance has the inflection point between 13:00 and 20:

00.

8. 8. The lighting system according to claim 1, wherein the equivalent melanopic illuminance decreases continuously with the passage of time from morning to night.

9. 9. The lighting system according to claim 1, wherein the controller stores information on the melanopic ratio and illuminance for each of the plurality of light sources, and controls the output of the plurality of light sources using the information so that the equivalent melanopic illuminance matches a setting value input from outside.

10. The lighting system according to claim 9, further comprising a user interface unit into which the setting values ​​are input.

11. The set values ​​are input for a plurality of time periods, 11. The lighting system according to claim 9, wherein the controller controls the outputs of the plurality of light sources so that the equivalent melanopic illuminance coincides with the set value in each of the plurality of time periods.

12. A user interface unit is provided, 10. The lighting system according to claim 1, wherein the user interface unit has a setting unit for setting a rate of change of the equivalent melanopic illuminance.

13. A user interface unit is provided, The lighting system according to any one of claims 1 to 9, characterized in that the user interface unit has a switching unit for switching between a mode in which the equivalent melanopic illuminance is reduced over time and a mode in which the illuminance of the multiple light sources is controlled to a constant level.

14. A user interface unit is provided, The lighting system according to any one of claims 1 to 9, characterized in that the user interface unit has a setting unit for setting which of the color temperature and illuminance obtained from the plurality of light sources should be changed first when reducing the equivalent melanopic illuminance.

15. a plurality of light sources having different emission spectra; a lighting circuit for lighting the plurality of light sources; a control unit that controls the lighting circuit; Equipped with the control unit controls the lighting circuit so as to reduce the equivalent melanopic illuminance obtained from the plurality of light sources as time passes from morning to night; A lighting device characterized in that the equivalent melanopic illuminance is controlled according to a curve whose state changes smoothly over time, with an inflection point as a boundary.

16. a control unit that reduces the equivalent melanopic irradiance obtained from a plurality of light sources having different emission spectra over time from morning to night; A lighting control device characterized in that the equivalent melanopic illuminance is controlled according to a curve whose state changes smoothly over time, with an inflection point as a boundary.

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