Illumination method

Abstract

To provide an illumination method that can improve versatility.SOLUTION: An illumination method emits light from a light source unit having at least one type of light-emitting element. The illumination method accepts the condition of the illumination environment including an object illuminated by the light source unit, and controls the light emitted from the light source unit on the basis of the received state and the ipRGC action amount represented by λ as the wavelength of the light emitted from the light source unit, S(λ) as the spectral radiation amount of the light emitted from the light source unit, k as a coefficient, and ipRGC(λ) as an action function.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] Embodiments of the present invention relate to a lighting method.

Background Art

[0002] Conventionally, in a lighting device having a light-emitting element, there is a technique for reducing glare by combining a band-pass filter that cuts light in a short-wavelength band among the light emitted from the light-emitting element and the light-emitting element.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the conventional technology has limited applications, it has poor versatility.

[0005] The problem to be solved by the present invention is to provide a lighting method capable of improving versatility.

Means for Solving the Problems

[0006] The lighting method according to the embodiment irradiates light from a light source unit having at least one or more light-emitting elements. The lighting method receives the situation of the lighting environment including the lighting target illuminated by the light source unit, λ is the wavelength of the light irradiated from the light source unit, S(λ) is the spectral radiant quantity of the light irradiated from the light source unit, k is a coefficient, and ipRGC(λ) is an action function. The light irradiated from the light source unit is controlled based on the ipRGC action amount represented by the following mathematical formula and the received situation When the situation is received, change the light irradiated from the light source unit so as to increase the ipRGC action amount without changing the correlated color temperature to do.

[0007]

Equation

Advantages of the Invention

[0008] According to the present invention, it is possible to provide an illumination method capable of improving versatility.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0010] The illumination method according to the embodiment described below is an illumination method for irradiating light from a light source unit 20 having at least one or more light emitting elements 21, which receives the situation of an illumination environment including an illumination target illuminated by the light source unit 20, where λ is the wavelength of the light irradiated from the light source unit 20, S(λ) is the spectral radiant amount of the light irradiated from the light source unit 20, k is a coefficient, and ipRGC(λ) is an action function. The light irradiated from the light source unit 20 is controlled based on the ipRGC action amount represented by the following mathematical formula and the received situation.

[0011]

Number

[0012] The lighting method according to the embodiment described below controls the light emitted from the light source unit 20 so as to vary the ipRGC action amount when a situation is received.

[0013] In the lighting method according to the embodiment described below, the light source unit 20 includes a first light emitting element 21a having a peak wavelength of 430 ± 10 nm, a second light emitting element 21b having a peak wavelength of 500 ± 10 nm, a third light emitting element 21c having a peak wavelength of 570 ± 10 nm, and a fourth light emitting element 21d having a peak wavelength of 630 ± 10 nm.

[0014] Hereinafter, with reference to the drawings, the lighting method according to the embodiment will be described in detail. The same reference numerals are given to the components having the same functions in the embodiment, and redundant descriptions are omitted. Note that the lighting method described in the following embodiments is merely an example and does not limit the embodiments.

[0015] [Embodiment] First, with reference to FIGS. 1 and 2, an application example of the lighting method according to the embodiment will be described. FIG. 1 is a perspective view showing an example of a lighting device using the lighting method according to the embodiment. FIG. 2 is a diagram showing an example of a lighting system using the lighting method according to the embodiment.

[0016] As shown in FIG. 1, the lighting device 10 includes a main body 11, a cover 12, and a light source unit 20. The lighting device 10 is, for example, a so-called base light that is attached to the ceiling surface with the cover 12 facing downward.

[0017] The main body 11 is an attachment part to be attached to the ceiling surface and also a support part for supporting the cover 12. Inside the main body 11, a light source part 20, a power supply part (not shown), etc. are accommodated. Inside the main body 11, a control part 40 (see FIG. 2) to be described later, etc. may be accommodated. The cover 12 is a cover that covers the light emitting surface of the lighting device 10 and diffuses the light irradiated from the light source part 20.

[0018] The light source part 20 is driven by the electric power supplied from the power supply part and irradiates light downward. The light source part 20 has at least one or more light emitting elements 21. The light source part 20 may have two or more types of light emitting elements 21 with different peak wavelengths, for example, four or more types.

[0019] Note that the lighting device 10 may be attached not only to the ceiling surface but also to an arbitrary attachment target such as a wall surface, for example. Also, the lighting device 10 is not limited to a base light, and may be an arbitrary form of lighting device having a light source part 20 such as a ceiling light, a downlight, a spotlight, etc. Further, the lighting device 10 may be indoor lighting for lighting an office, a store, a facility, etc., or outdoor lighting for lighting the surroundings of a store, a facility, etc. Also, the light source part 20 may be possessed by a lighting device 10 that can be carried by a user such as a portable light, or may be possessed by a terminal device such as a smartphone, a tablet terminal, a mobile phone, a PC (Personal Computer), a PDA (Personal Data Assistance).

[0020] The lighting system 1 shown in FIG. 2 has a light source part 20, an input part 31, a sensor part 32, a control part 40, and a storage part 50. The light source part 20, the control part 40, and the storage part 50 are, for example, possessed by the lighting device 10 shown in FIG. 1. Also, at least a part of the light source part 20, the input part 31, the control part 40, and the storage part 50 may be configured as one or two or more members different from the lighting device 10. Also, at least one of the input part 31 and the sensor part 32 may not be possessed by the lighting system 1.

[0021] The light source unit 20 shown in Fig. 2 includes four types of light-emitting elements 21 (first to fourth light-emitting elements 21a to 21d). The light-emitting element 21 has, for example, a semiconductor light-emitting element such as an LED (Light Emitting Diode). As the LED, for example, an InGaN-based LED which is a gallium nitride-based LED can be adopted. Note that the light-emitting element 21 may have, for example, a phosphor. Further, the light-emitting element 21 may emit laser light.

[0022] The light-emitting element 21 is electrically connected to the control unit 40. When the light source unit 20 has a plurality of types of light-emitting elements 21 having different peak wavelengths, each of the light-emitting elements 21 is electrically connected to the control unit 40 so as to be independently controllable for each peak wavelength of the light-emitting element 21.

[0023] The first light-emitting element 21a has, for example, a peak wavelength of about 430 nm and is a light-emitting element having a blue emission color. The first light-emitting element 21a may have a peak wavelength of 430 ± 10 nm.

[0024] The second light-emitting element 21b has, for example, a peak wavelength of about 500 nm and is a light-emitting element having a cyan emission color. The second light-emitting element 21b may have a peak wavelength of 500 ± 10 nm.

[0025] The third light-emitting element 21c has, for example, a peak wavelength of 570 nm and is a light-emitting element having a yellow emission color. The third light-emitting element 21c may have a peak wavelength of 570 ± 10 nm.

[0026] The fourth light-emitting element 21d has, for example, a peak wavelength of about 630 nm and is a light-emitting element having a red emission color. The fourth light-emitting element 21d may have a peak wavelength of 630 ± 10 nm. Note that since the wavelength of the fourth light-emitting element 21d has little influence on the action amount of ipRGC, as long as it is within the range of the above-described first to third light-emitting elements 21a to 21c, the wavelength of the fourth light-emitting element 21d may be 640 nm or more, preferably 640 to 690 nm.

[0027] The first to fourth light-emitting elements 21a to 21d may be arranged so that they are adjacent to each other as shown in FIG. 2, and may be arranged in any arrangement, such as a staggered arrangement. Further, the light source unit 20 may have one or a plurality of the first to fourth light-emitting elements 21a to 21d respectively. Further, the lighting system 1 may have a plurality of light source units 20.

[0028] Further, the lighting device 10 is not limited to a base light, and for example, any form of lighting device having a light source unit 20, such as a ceiling light, a downlight, a spotlight, etc., can be adopted. Further, the lighting device 10 may be portable, such as a stand light or a portable light. Further, the light source unit 20 may be included in terminal devices such as a smartphone, a tablet terminal, a PC (Personal Computer), a mobile phone, a PDA (Personal Data Assistance), etc.

[0029] Information regarding the situation of the lighting environment including the lighting target illuminated by the light source unit 20 is input to the input unit 31. When the input unit 31 is included in a terminal device having, for example, a touch panel function, various information is input via the display screen of the terminal device. Further, various information may be input to the input unit 31 by a voice recognition function.

[0030] Operations of, for example, a user of the terminal device or the like may be input to the input unit 31, or operations of an administrator or the like who manages the lighting system 1 or the lighting device 10 may be input. The information input to the input unit 31 is output to the control unit 40. The information output to the control unit 40 may include, for example, attributes of the lighting target illuminated by the light source unit 20 (for example, personal data of the user such as gender, age or age group, light sensitivity, etc.), the number of people, the staying time, etc.

[0031] The sensor unit 32 detects information regarding the situation of the illumination environment including the illumination target illuminated by the light source unit 20. The sensor unit 32 has, for example, an image sensor. The sensor unit 32 may have, for example, an infrared sensor or RFID (Radio Frequency Identification). Further, the sensor unit 32 may have, for example, an environmental sensor that detects the weather etc. in the illumination environment or an illuminance sensor that detects brightness. Note that the sensor unit 32 may have a plurality of sensors. Such a plurality of sensors may have the same detection method and / or detection, or may be different. Also, the sensor unit 32 may detect various information based on the environmental sound collected by the microphone or music etc.

[0032] The information detected by the sensor unit 32 is output to the control unit 40. The information output from the sensor unit 32 may include, for example, the weather, the actions and number of people of the illumination target illuminated by the light source unit 20, the brightness of the illumination environment, the staying period, etc.

[0033] The storage unit 50 stores programs for realizing various controls of the control unit 40. The storage unit 50 is realized by, for example, a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory, or a storage device such as a hard disk or an optical disk. Requirements information regarding the parameters of the illumination environment is stored in the storage unit 50.

[0034] FIG. 3 is a diagram showing an example of the parameters of the illumination environment. As shown in FIG. 3, the parameters of the illumination environment can include, for example, the weather, the type of the facility etc. where the lighting device 10 is located, the attributes of the users who use the facility etc., the staying time, the actions, the usage, the number of users, the brightness, etc.

[0035] In the storage unit 50, the parameters of the illumination environment illustrated in FIG. 3 and the control requirements of the light source unit 20 are stored in association with each other.

[0036] The control unit 40 controls the light source unit 20. The control unit 40 is realized, for example, by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), etc., when various programs stored in the internal memory are executed using the RAM as a work area. Also, the control unit 40 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0037] The control unit 40 executes a predetermined process on the light emitting element 21 and controls the light irradiated from the light source unit 20. The control unit 40 includes a reception unit 41 and an illumination control unit 42.

[0038] The reception unit 41 receives the situation of the illumination environment including the illumination target illuminated by the light source unit 20. The reception unit 41 acquires, for example, the information output from the input unit 31 or the sensor unit 32. The situation of the illumination environment received by the reception unit 41 includes, for example, information regarding one or more of the parameters of the illumination environment shown in FIG. 3. Also, the reception unit 41 may acquire the current time from, for example, the illumination device 10, the input unit 31, or the sensor unit 32.

[0039] The illumination control unit 42 controls the light irradiated from the light source unit 20 based on the situation received by the reception unit 41. The illumination control unit 42 controls the lighting state of the light emitting element 21 based on the situation received by the reception unit 41 and the information stored in the storage unit 50. Here, an example of the process executed by the illumination control unit 42 will be described with reference to FIGS. 4 to 8. FIG. 4 is a diagram showing the relationship between the correlated color temperature and the ipRGC action amount. Also, FIG. 5 is a diagram showing an example of the spectral spectrum in the case of a correlated color temperature of 2700K, FIG. 6 is a diagram showing an example of the spectral spectrum in the case of a correlated color temperature of 2700K+ or higher, FIG. 7 is a diagram showing an example of the spectral spectrum in the case of a correlated color temperature of 8000K, and FIG. 8 is a diagram showing an example of the spectral spectrum in the case of a correlated color temperature of 8000K or lower.

[0040] Fig. 4 shows a two-dimensional plane with the correlated color temperature [K] on the horizontal axis and the ipRGC action amount per 1000 cd / m 2 ² on the vertical axis. When the luminance of the light emitted from the light source unit 20 is A (cd / m 2 ²), the illumination control unit 42 controls the light emitted from the light source unit 20 based on the wavelength λ, the spectral radiant quantity S(λ) of the light emitted from the light source unit 20, the ipRGC action amount represented by the following mathematical formula (Equation 3) with the action function ipRGC(λ), and the information received by the reception unit 41.

[0041]

Equation

[0042] In this study, a light source using a light-emitting element with a peak wavelength of the spectral spectrum of about 430 nm, a light-emitting element with a peak wavelength of the spectral spectrum of about 500 nm, a light-emitting element with a peak wavelength of the spectral spectrum of about 570 nm, and a light-emitting element with a peak wavelength of the spectral spectrum of about 630 nm is used.

[0043] Then, a subject experiment on which of two light sources, 2700K and 2700K+, with the same action amounts of L-cones, M-cones, and S-cones and different ipRGC action amounts, is more dazzling, and a subject experiment on which of two light sources, 8000K and 8000K-, with the same action amounts of L-cones, M-cones, and S-cones and different ipRGC action amounts, is more dazzling were conducted.

[0044] Although the luminance notations are omitted, 2700K, 2700K+, 8000K, and 8000K- all have the same luminance. And as shown in Fig. 5, for the correlated color temperature of 2700K, (L action amount, M action amount, S action amount, ipRGC action amount) = (1.6, 1.1, 0.2, 0.6), and as shown in Fig. 6, for the correlated color temperature of 2700K+, (L action amount, M action amount, S action amount, ipRGC action amount) = (1.6, 1.1, 0.2, 1.5). Also, as shown in Fig. 7, for the correlated color temperature of 8000K, (L action amount, M action amount, S action amount, ipRGC action amount) = (1.5, 1.3, 1.0, 1.5), and as shown in Fig. 8, for the correlated color temperature of 8000K-, (L action amount, M action amount, S action amount, ipRGC action amount) = (1.5, 1.3, 1.0, 0.6).

[0045] 2700K is a light source with a correlated color temperature of 2700K and is adjusted to approach the same ipRGC action amount as the reference light source of 2700K. 2700K+ is a light source adjusted so that the action amounts of the L cone, M cone, and S cone are the same as those of 2700K, and the ipRGC action amount becomes equivalent to that of 8000K described later. The spectral spectrum of 2700K is shown in Fig. 5, and the spectral spectrum of 2700K+ is shown in Fig. 6.

[0046] 8000K is a light source with a correlated color temperature of 8000K and is adjusted to approach the same ipRGC action amount as the reference light source of 8000K. 8000K- is a light source adjusted so that the action amounts of the L cone, M cone, and S cone are the same as those of 8000K, and the ipRGC action amount becomes equivalent to that of 2700K described above. The spectral spectrum of 8000K is shown in Fig. 7, and the spectral spectrum of 8000K- is shown in Fig. 8.

[0047] In addition, as a result of the subject experiment, it was found that when the ipRGC action amount was controlled and the correlated color temperature was 2700K (2700K+), it felt as dazzling as the correlated color temperature of 8000K. Also, when the ipRGC action amount was controlled and the correlated color temperature was 8000K (8000K-), it was found that it felt as dazzling as the correlated color temperature of 2700K. That is, by controlling the ipRGC action amount in the light with a correlated color temperature of 8000K, which is generally high-glare (dazzling) light, and the light with a correlated color temperature of 2700K, which is generally low-glare (not dazzling) light, it is possible to create light with a correlated color temperature of 8000K but with glare equivalent to that of 2700K (not dazzling), or light with a correlated color temperature of 2700K but with glare equivalent to that of 8000K (dazzling).

[0048] In this study, in order to confirm the influence of the ipRGC action amount, a comparison was made between two spectra with the same action amounts of L cones, M cones, and S cones. However, even under conditions where the action amounts of L cones, M cones, and S cones are not the same, it is possible to create the above-mentioned light by controlling the ipRGC action amount.

[0049] In addition, the area confirmed in this study is shown in FIG. 4. FIG. 4 is a two-dimensional plane with the correlated color temperature [K] on the horizontal axis and the ipRGC action amount per 1000 cd / m 2 on the vertical axis, and it is the area surrounded by four points of (correlated color temperature, ipRGC action amount) = (2700, 0.6), (2700, 1.5), (8000, 1.5), and (8000, 0.6).

[0050] For example, as Light 1, (correlated color temperature, ipRGC action amount per 1000 cd / m 2 ) = (K1, α), and as Light 2, (correlated color temperature, ipRGC action amount per 1000 cd / m 2 ) = (K2, β), are created. Note that K1 and K2 are arbitrary points within the range of the correlated color temperature shown in FIG. 4. At this time, when α > β, Light 1 feels more dazzling.

[0051] Conversely, when α < β, light 2 feels brighter. In these cases, even under the condition that K1 ≠ K2, it is possible to sense the difference in brightness depending on the magnitudes of α and β. However, under the condition that K1 = K, it becomes possible to more significantly sense the difference in brightness. For example, by controlling the light source unit 20 so as to have a relationship of 1.1α ≤ β ≤ 2α, light B is more likely to be felt as brighter than light A.

[0052] Also, the evaluation formula for quantifying uncomfortable glare is shown in the following formula (Formula 4). Here, L is the luminance [cd / m 2 of the light emitted from the light source unit 20, ω is the solid angle [sr] of the light emitting surface of the lighting fixture, p is the position index [-] of the light emitted from the light source unit 20, Lb is the background luminance, and ipRGC is the ipRGC action amount calculated using the spectral radiant flux of the light emitted from the light source unit 20 and Formula 2.

[0053]

Equation

[0054] Here, G in Formula (Formula 4) ipRGC is a numerical value indicating the degree of uncomfortable glare and can be expressed as the score shown in Table 1. Note that Table 1 shows the correlation between the degree of uncomfortable glare and the score and is the same as the table showing the relationship between the uncomfortable glare UGR and the degree of uncomfortable glare. Also, G ipRGC increases by 1 point, for example, with a 0.1-point increase in the ipRGC action amount in FIG. 4. That is, in this case, when the ipRGC action amount increases by 0.3 points, G ipRGC increases by 3 points, so the degree of uncomfortable glare increases by one level. Therefore, the degree of brightness can be controlled by changing the ipRGC action amount so that G ipRGC changes by one level.

[0055] Conventionally, the degree of brightness was expressed only by the first term of Formula (Formula 4), but in this embodiment, the ipRGC action amount is incorporated into the second term and G ipRGCBy using such an index, it becomes possible to express the degree of glare considering the ipRGC action amount. Note that for the second term in the formula (Formula 4), in addition to the ipRGC action amount, ratios of ipRGCs (calculated from Formula 5) or action amounts calculated from Formulas 2 and 3 may be used by changing the coefficients (a, c).

[0056]

Table 1

[0057] For example, by using the following formulas (Formulas 5 and 6), the relationships between the values calculated from each formula (ipRGC ratio, ipRGC difference, etc.) and discomfort glare change, and the relationships between the values calculated from each formula and discomfort glare change depending on S(λ) used in this formula. When calculating the results in Fig. 4 using the following formula (Formula 5), the ipRGC action amount changes by about 1 point of discomfort glare for about 0.6 points, and when using Formula 6 with S(λ) being the spectral radiant quantity of a white calibration plate installed directly below the light source, it means that the degree of discomfort glare changes by about 1 point for about 0.1 points of the ipRGC action amount. Note that S(λ) in Formulas 5 and 6 is the spectral radiant quantity (spectral radiant luminance or spectral irradiance) of the light irradiated from the light source unit 20, S base (λ) is the spectral radiant quantity (spectral radiant luminance or spectral irradiance) of light with the same standards for S(λ), chromaticity, and luminance (blackbody radiation for less than 5000K, CIE daylight for 5000K or more), and k, m, n are coefficients.

[0058]

Equation

Equation

[0059] When the information received by the reception unit 41 satisfies the control requirements stored in the storage unit 50, the lighting control unit 42 changes the light irradiated from the light source unit 20 from light A to light C, that is, without changing the correlated color temperature, to 1000 cd / m 2Increase the action amount of ipRGC per unit by 0.9 points, or change from light A to light B (1000 cd / m 2 By increasing the action amount of ipRGC per unit by 0.9 points and increasing the correlated color temperature, the lighting control unit 42 controls the light emitted from the light source unit 20 so that it is felt to be "bright" according to the information received by the reception unit 41.

[0060] Thus, the control method according to the embodiment can make the lighting target illuminated by the light source unit 20 feel "bright", and by deliberately making the comfort in the lighting environment worse, it is possible to promote behavioral changes in the lighting target that satisfies a predetermined control requirement. An application example of such a control method will be described below.

[0061] <Application Example of Lighting Method> The lighting system 1 is applied, for example, in a restaurant such as an izakaya where there is a time limit for staying. The light source unit 20 is possessed by a tablet terminal or other terminal device that enables a user of the facility to, for example, check a menu, place an order, settle an account, etc.

[0062] The light source unit 20 lights up so as to emit, for example, light A shown in FIG. 4 until a predetermined planned staying time elapses. The light A emitted from the light source unit 20 lights up at a correlated color temperature K1 of about 2700 [K], for example, and can provide a comfortable lighting environment that is less likely to make the user of the terminal device feel "bright".

[0063] When the reception unit 41 receives an indication of an overstay of the scheduled stay time, the lighting control unit 42 controls the light-emitting element 21 so that the light B is irradiated from the light source unit 20. The light B irradiated from the light source unit 20 lights up at a correlated color temperature K2 = 2700 + [K], for example, and provides uncomfortable lighting that is likely to make the user of the terminal device feel "dazzling". Since the relationship of feeling uncomfortable is prominent by increasing the action amount of ipRGC even at the same correlated color temperature in this way, the lighting system 1 can provide a lighting method that prompts the user who has exceeded the scheduled stay time to evacuate from the facility promptly. Note that the lighting control unit 42 may control the light-emitting element 21 in a time shorter than the scheduled stay time. Further, the lighting control unit 42 may control the light-emitting element 21 based on the closing time.

[0064] Note that the light source unit 20 is not limited to the terminal device, and may be provided in one or a plurality of lighting devices arranged in the facility, such as the lighting device 10 arranged in an individual room, for example. Thereby, it is possible to accurately prompt the target user to change their behavior.

[0065] <First Modification Example of Lighting Method> The lighting system 1 is applied, for example, to a store that is open at night, such as a convenience store. The light source unit 20 has, for example, an outdoor lighting device 10 that illuminates the surroundings of the facility.

[0066] When the reception unit 41 receives information indicating the detection of the presence of a plurality of people from the sensor unit 32 that detects the state outside the store, for example, the lighting control unit 42 controls the light source unit 20 that is lit to emit the light A shown in FIG. 4 so that the light B is irradiated. Thereby, the lighting system 1 can provide a lighting method that prompts the people staying outside the store to evacuate promptly.

[0067] Note that the lighting control of the light source unit 20 by the lighting control unit 42 may be triggered, for example, when the reception unit 41 receives information indicating that the presence of a person has been continuously detected for a predetermined time or more, or when the reception unit 41 receives information indicating that a person has been maintaining a predetermined posture continuously.

[0068] Note that the light emitted by the lighting device 10 that illuminates the surroundings of the facility may be shielded as necessary so that it does not enter the field of vision of the users of the store.

[0069] <Second Modified Example of Lighting Method> The lighting system 1 is applied, for example, in facilities such as offices used for various purposes such as ABW (Activity Based Working). The light source unit 20 is, for example, provided in the lighting device 10 that illuminates the office.

[0070] The light source unit 20 is lit, for example, from time T1 to time T2 so as to emit the light B shown in FIG. 4. The light A emitted from the light source unit 20 can provide a lighting environment in which, for example, a refreshing feeling or a sense of awakening can be easily obtained for the users of the facility illuminated by the light source unit 20.

[0071] When the reception unit 41 receives time T2, the lighting control unit 42 controls the light emitting element 21 so that the light A is emitted from the light source unit 20. The light B emitted from the light source unit 20 provides comfortable lighting that is less likely to make the users of the facility illuminated by the light source unit 20 feel, for example, "dazzling". Thereby, the lighting system 1 can provide a lighting environment in which the user can, for example, relax and perform work. Note that the light source unit 20 may have a light emitting element 21 that emits ultraviolet light, for example, for the purpose of sterilization in the facility and the action with a fluorescent brightener.

[0072] Note that the light source unit 20 is not limited to the terminal device, and may be provided in one or a plurality of lighting devices arranged in the facility, such as the lighting device 10 arranged in the individual room. Thereby, it is possible to accurately prompt the target user to change their behavior.

[0073] Note that the lighting control of the light source unit 20 by the lighting control unit 42 may be triggered, for example, when the reception unit 41 receives information indicating that the presence of a person has been detected continuously for a predetermined time or more, or when the reception unit 41 receives information indicating that a person has been maintaining a predetermined posture continuously.

[0074] <Other Modification Examples> In the above embodiment, the ipRGC action amount is converted into a numerical value per 1000 cd / m 2 However, the ipRGC action amount may be calculated by integrating the relative value of the specific luminous sensitivity ipRGC(λ) of ipRGC and the spectral radiant flux S(λ) of the light source at wavelength λ (see Equation 1). Also, the ipRGC ratio, ipRGC difference, etc. shown in Equation 5 and Equation 6 may be used. Note that the unit of the spectral radiant flux S(λ) is W / m 2 / sr or W / m 2 is used.

[0075] Also, as the ipRGC action amount, it may be defined as a value converted to an arbitrary numerical value instead of a value converted to a numerical value per 1000 cd / m 2 . In that case, in Equation 2 and Equation 3, the ipRGC action amount is derived by an equation in which the part of 1000 (cd / m 2 ) is replaced with an arbitrary numerical value. Also, as the ipRGC action amount, it is not necessarily required to be normalized based on luminance (cd / m 2 ), and it may be normalized based on an appropriate unit of light in the International System of Units such as luminous flux (lm), illuminance (lx), luminous intensity (cd), etc.

[0076] Also, the region confirmed in this study of this embodiment is different, and it may be a two-dimensional plane provided with correlated color temperature [K] on the horizontal axis and the ipRGC action amount per 1000 cd / m 2 on the vertical axis, and may be a region surrounded by four points of (correlated color temperature, ipRGC action amount) = (2700, 0.3), (2700, 1.5), (8000, 3.0), (8000, 0.6).

[0077] Furthermore, in the present consideration of this embodiment, when using four types of light-emitting elements having peak wavelengths of 430 nm, 500 nm, 570 nm, and 630 nm, various color rendering properties (Ra) can be realized at 2700 K and under conditions fixed to any iPRGC. However, when it is desired to widen the variable range of the color rendering property (Ra) in the direction of increasing the color rendering property in this state, for example, a light-emitting element having a peak at 640 nm or more may be added as the fifth light-emitting element.

[0078] Also, in the embodiment and each modification, the illumination control unit 42 has been described as controlling the light source unit 20 to switch between light A and light B having different correlated color temperatures. However, the present invention is not limited to this. As shown in FIG. 4, the control may be performed to switch between light A and light C having the same correlated color temperature.

[0079] As described above, the illumination method according to the embodiment is an illumination method for irradiating light from a light source unit 20 having at least one type of light-emitting element 21, which receives the situation of the illumination environment including the illumination target illuminated by the light source unit 20, where λ is the wavelength of the light irradiated from the light source unit 20, S(λ) is the spectral radiant amount of the light irradiated from the light source unit 20, k is a coefficient, and the light irradiated from the light source unit 20 is controlled based on the ipRGC action amount represented by the action function ipRGC(λ) and the received situation. Thereby, the versatility can be improved.

[0080] Also, the illumination method according to the embodiment controls the light irradiated from the light source unit 20 so as to vary the ipRGC action amount when receiving the situation. Thereby, the versatility can be improved.

[0081] In the illumination method according to the embodiment described below, the light source unit 20 includes a first light-emitting element 21a having a peak wavelength of 430 ± 10 nm, a second light-emitting element 21b having a peak wavelength of 500 ± 10 nm, a third light-emitting element 21c having a peak wavelength of 570 ± 10 nm, and a fourth light-emitting element 21d having a peak wavelength of 630 ± 10 nm. Thereby, the versatility can be improved.

[0082] Although embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

Explanation of Reference Numerals

[0083] 1 Lighting system 10 Lighting device 20 Light source unit 21 Light-emitting element 31 Input unit 32 Sensor unit 40 Control unit 41 Reception unit 42 Lighting control unit 50 Storage unit

Claims

1. An illumination method for irradiating light from a light source unit having at least one type of light-emitting element, comprising: receiving the situation of an illumination environment including an illumination target illuminated by the light source unit; controlling the light irradiated from the light source unit based on the ipRGC action amount represented by the following formula and the received situation, where λ is the wavelength of the light irradiated from the light source unit, S(λ) is the spectral radiant amount of the light irradiated from the light source unit, k is a coefficient, and ipRGC(λ) is an action function; An illumination method of changing the light irradiated from the light source unit so as to increase the ipRGC action amount without changing the correlated color temperature when the situation is received. 【Number 1】

2. The illumination method according to Claim 1, wherein the light source unit includes a first light-emitting element having a peak wavelength of 430 ± 10 nm, a second light-emitting element having a peak wavelength of 500 ± 10 nm, a third light-emitting element having a peak wavelength of 570 ± 10 nm, and a fourth light-emitting element having a peak wavelength of 630 ± 10 nm. The illumination method according to Claim 1.

Images