A lighting fixture

Abstract

A lighting fixture includes a lamp body and a light-emitting source disposed within the lamp body. The light-emitting source includes a white light generating portion and a red light generating portion that emits red light. The white light generating portion emits a first white light, and the light emitted by the red light generating portion is red light with a peak wavelength in the range of greater than or equal to 600 nm to less than or equal to 780 nm. The light emitted by the red light generating portion and the white light generating portion is mixed to form a second white light. The lighting fixture only lights up the white light generating portion to emit the first white light in the first working mode, and lights up both the white light generating portion and the red light generating portion to emit the second white light in the second working mode. The lighting fixture of the present application provides two working modes, increasing the energy illumination in the red light area during specific periods to meet the balanced requirements of the working efficiency and rhythm stimulation of workers at night, and can meet the different requirements of two different application scenarios, namely night work and daily lighting.

Description

Technical Field

[0001] The present invention relates to a lighting fixture for lighting. Background Art

[0002] According to the research reports of scientists, there are a third type of photoreceptor cells ipRGCs in the human eye retina. Through these cells, the external light sensed by the human eye is transmitted to the human brain nervous system, which in turn affects the secretion of cortisol, melatonin, etc., thus affecting human health, happiness, alertness, sleep quality, human body biological clock, etc.

[0003] In order to improve or maintain the concentration, alertness, and work efficiency of people during the day, lighting conditions with a higher CS value (higher illuminance, high color temperature, and higher blue-green light spectral intensity) are generally adopted to inhibit melatonin secretion; when resting and relaxing at night, lighting conditions with a lower CS value (lower illuminance, low color temperature, and lower blue-green light spectral intensity) are adopted to promote melatonin secretion. Such lighting conditions are more in line with the rhythm requirements of the human body.

[0004] In real life, however, many people still have to work at night (such as overtime workers or shift workers). Using the original high-illuminance and high-color-temperature light at night will affect people's rhythm, sleep quality, and health; using the original low-illuminance and low-color-temperature light for night work will affect work efficiency. Therefore, it is an urgent problem to provide a lighting device with a lower CS value that meets the rhythm stimulation requirements and can keep the users more focused without affecting work efficiency. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and find a lighting fixture that can balance the work efficiency (concentration) of night workers (shift workers) and the human rhythm stimulation.

[0006] To achieve the above functions, the technical solution adopted by the present invention is to provide a lighting fixture, including a lamp body and a light source disposed within the lamp body. It is characterized in that the light source includes a white light generating portion and a red light generating portion that emits red light. The white light generating portion emits a first white light, and the light emitted by the red light generating portion is red light with a peak wavelength in the range of greater than or equal to 600 nm to less than or equal to 780 nm. The light emitted by the red light generating portion and the white light generating portion is mixed to form a second white light. The lighting fixture only lights the white light generating portion to emit the first white light in the first working mode, and lights both the white light generating portion and the red light generating portion to emit the second white light in the second working mode. The lighting fixture further includes a controller. The controller is electrically connected to the white light generating portion and controls the output power of the white light generating portion through a first parameter. The controller is electrically connected to the red light generating portion and controls the output power of the red light generating portion through a second parameter. The controller receives an external command or controls the lighting of the red light generating portion according to a switching time, and the lighting fixture enters the second working mode from the first working mode.

[0007] Preferably, the controller controls the overall illuminance of the lighting fixture to be maintained between 250 and 450 lux in the second working mode.

[0008] Preferably, in the first working mode, the illuminance of the lighting fixture is maintained between 250 and 450 lux. When the controller controls the lighting of the red light generating portion, the controller changes the first parameter and the second parameter to make the overall illuminance of the lighting fixture remain consistent before and after lighting the red light generating portion.

[0009] Preferably, in the first working mode, the illuminance of the lighting fixture is maintained between 500 and 1000 lux. When the controller controls the lighting of the red light generating portion, the controller changes the first parameter and the second parameter to make the overall illuminance of the lighting fixture change from bright to dim.

[0010] Preferably, the controller includes a clock module, and the switching time is preset in the clock module. The switching time is a certain moment within the range of 17:00 - 19:00 every afternoon or within the range of local sunset time ± 1 h.

[0011] Preferably, the first parameter and the second parameter are current values, voltage values or PWM signals.

[0012] Preferably, the lighting fixture further includes an isolation structure. The isolation structure is disposed within the lamp body. The red light generating portion is disposed within the isolation structure, and the white light generating portion is disposed within and outside the isolation structure.

[0013] Preferably, in the second operating mode, the spectral radiant energy of the light emitted by the red light generating unit in the range of greater than or equal to 600 nm to less than or equal to 780 nm accounts for 30.0 - 50.0% of the total radiant energy of the second white light formed after mixing in the visible light region, that is, in the range of greater than or equal to 380 nm to less than or equal to 780 nm.

[0014] Preferably, in the second operating mode, the spectral radiant energy of the light emitted by the red light generating unit in the range of greater than or equal to 600 nm to less than or equal to 780 nm accounts for 36.0 - 48.0% of the total radiant energy of the second white light formed after mixing in the visible light region, that is, in the range of greater than or equal to 380 nm to less than or equal to 780 nm.

[0015] Preferably, the color temperature of the second white light is 2500K - 6500K, and the distance Duv between the positions on the CIE1931 chromaticity diagram located between the blackbody locus BBL is in the range of (0.000, -0.015].

[0016] Preferably, the distance Duv between the second white light and the blackbody locus BBL on the CIE1931 chromaticity diagram is in the range of [-0.003, -0.012].

[0017] Preferably, the color rendering index of the first white light and the second white light emitted by the light source module is above 80.0.

[0018] The Lighting Research Center LRC in the United States found through human experiments that red light does not inhibit melatonin secretion, but can, like white light (with a high blue light component), enhance nocturnal alertness and performance. Based on this theory, the lamps provided by the present invention optimize the spectral distribution, provide two operating modes, and increase the energy illumination in the red light region during specific periods to meet the balanced requirements of the working efficiency and rhythm stimulation of workers at night, and can meet the different requirements of two different application scenarios, namely night work and daily lighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of a lamp in a preferred embodiment of the present invention;

[0020] Figure 2 is a distribution diagram of each preferred embodiment of the present invention on the CIE1931 chromaticity diagram;

[0021] Figure 3 is an emission spectrum diagram of the red light generating unit in a preferred embodiment of the present invention;

[0022] Figure 4 is an emission spectrum diagram of the white light generating unit in a preferred embodiment of the present invention;

[0023] Figure 5It is the emission light spectrum diagram of the second white light in the preferred embodiment 1 of the present invention;

[0024] Figure 6 It is the emission light spectrum diagram of the second white light in the preferred embodiment 2 of the present invention;

[0025] Figure 7 It is the emission light spectrum diagram of the second white light in the preferred embodiment 3 of the present invention;

[0026] Figure 8 It is the emission light spectrum diagram of the second white light in the preferred embodiment 4 of the present invention;

[0027] Figure 9 It is the emission light spectrum diagram of the second white light in the preferred embodiment 5 of the present invention;

[0028] Figure 10 It is the emission light spectrum diagram of the second white light in the preferred embodiment 6 of the present invention;

[0029] Figure 11 It is the emission light spectrum diagram of the second white light in the preferred embodiment 7 of the present invention;

[0030] Figure 12 It is the emission light spectrum diagram of the second white light in the preferred embodiment 8 of the present invention;

[0031] Figure 13 It is the emission light spectrum diagram of the second white light in the preferred embodiment 9 of the present invention;

[0032] Figure 14 It is the emission light spectrum diagram of the second white light in the preferred embodiment 10 of the present invention. Detailed implementation manners

[0033] In order to improve or maintain a person's concentration, alertness, and work efficiency during the day, generally, lighting conditions with a higher CS value (higher illuminance, high color temperature, and higher blue-green light spectral intensity) are adopted to inhibit melatonin secretion; when resting and relaxing at night, lighting conditions with a lower CS value (lower illuminance, low color temperature, and lower blue-green light spectral intensity) are adopted to promote melatonin secretion. Such lighting conditions are more in line with the rhythm requirements of the human body. In real life, however, there are quite a number of people who still need to work at night (such as overtime workers or shift workers). Using the original high-illuminance and high-color-temperature light at night will affect a person's rhythm, sleep quality, and health; using the original low-illuminance and low-color-temperature light for night work will, on the other hand, affect work efficiency. The LRC human experiment of the Lighting Research Center in the United States found that red light does not inhibit melatonin secretion, but can, like white light (with a high blue light component), enhance night-time alertness and performance.

[0034] Combined with the above research results, the present application provides a lamp with an energy distribution in the red light region within a specific time. Hereinafter, with reference to the accompanying drawings and some preferred embodiments in line with the present application, a lamp proposed by the present application will be further described in detail.

[0035] A preferred embodiment of the lamp in the present application is as Figure 1 shown as a lamp panel installed on the top of a building. The lamp panel includes a chassis 6, a frame 5, and a panel 3. The panel 3 is assembled on the chassis 6 through the frame 5 to form a lamp body with an accommodation space inside. A red light generating part 1 and a white light generating part 2 are arranged inside the lamp body, and both are fixed on the chassis 6, emitting light towards the panel 3. The white light generating part 2 is a white light LED that emits a first white light. The red light generating part 1 is a red light LED that emits red light with a peak wavelength in the range of greater than or equal to 600 nm to less than or equal to 780 nm, and preferably, the peak wavelength is in the range of greater than or equal to 630 nm to less than or equal to 690 nm. The light emitted by the red light generating part 1 and the white light generating part 2 is mixed in the lamp body to form a second white light. A controller 7 is also arranged inside the lamp body. The controller 7 can be an MCU and is electrically connected to the white light generating part 2 and the red light generating part 1. The controller 7 controls the output power of the white light generating part 2 through a first parameter and controls the output power of the red light generating part 1 through a second parameter. The first parameter and the second parameter can be current, voltage values, or PWM signals. By changing the first parameter and the second parameter, the illuminance of the lamp can be achieved.

[0036] The addition of red light is to improve the user's alertness. However, it is not necessary to specifically improve alertness at every moment. Therefore, the lamp provides two working modes. In the first working mode, only the white light generating part 2 is lit to provide daily lighting. In the second working mode, both the white light generating part 2 and the red light generating part 1 are lit simultaneously. The controller 7 may include a wireless communication module, which communicates with an external control interface wirelessly, receives an external control signal, and switches between the first working mode and the second working mode. The wireless communication module may be a wireless communication module such as wifi, Bluetooth, Zigbee, 2.4G, etc. This application does not make a limitation in this regard. The external control interface may be an APP installed on a handheld mobile device, or a wall control panel, etc. In addition, a combination switch may be set on the wall to send a control signal to the controller 7 by wire. In addition to switching modes by receiving a control signal, usually users tend to prefer that the lamp can automatically perform such switching. Therefore, in this embodiment, the controller 7 further includes a clock module to preset a switching time. The controller 7 controls the lamp to automatically light the red light generating part 1 at the switching time and switch from the first working mode to the second working mode. The switching time may be set to a certain moment within the range of 17:00 - 19:00 every afternoon or within the range of local sunset time ± 1h. At the same time, the controller 7 controls and changes the first parameter and the second parameter so that the overall illuminance of the lamp remains consistent before and after lighting the red light generating part 1. In this way, the switching process will not be noticed by the user, and the user experience is better. The purpose of the present invention is to provide a lamp suitable for night work. In order not to inhibit the secretion of melatonin, the night lamp should not be too bright. Therefore, when the lamp works in the second working mode, the controller 7 will control the red light generating part 1 and the white light generating part 2 through the first parameter and the second parameter so that the overall illuminance of the lamp is maintained between 250 and 450 lux. As we have described before, the illuminance remains unchanged before and after the working mode switching. In other words, in this embodiment, the illuminance of the lamp in the first working mode will also be maintained between 250 and 450 lux, which is suitable for night use.

[0037] In another preferred embodiment, the illuminance of the lamp is variable. In the first working mode, the controller 7 controls the illuminance of the lamp to be maintained between 500 and 1000 lux. After reaching the switching time, it switches from the first working mode to the second working mode, and the overall lamp becomes dimmer. At the same time, the red light generating part 1 is lit to compensate for the problem of decreased concentration caused by the decrease in illuminance and the reduction of the energy of the blue light part. In this embodiment, the lamp can achieve high illuminance and high color temperature during the day to improve work efficiency, low illuminance and low color temperature from evening to night, without affecting the biological rhythm, and at the same time provide better concentration. Among them, the switching between the first and second working modes can still be carried out by external control or autonomous switching. When switching autonomously, the recommended switching time is a certain moment within the range of 17:00 - 19:00 every afternoon or within the range of local sunset time ± 1h.

[0038] In this application, red light is added to enhance alertness and concentration. However, the comfort of normal lighting also needs to be considered. The light color of the lamp should not appear too red, and the amount of red light should be ensured. Therefore, it is required that the spectral radiant energy of the red light emitted by the red light emitting part 1 in the range of greater than or equal to 600 nm to less than or equal to 780 nm accounts for 30.0 - 50.0% of the total radiant energy of the second white light formed after mixing in the visible light region, that is, greater than or equal to 380 nm to less than or equal to 780 nm. Preferably, it is 36.0 - 48.0%.

[0039] In the preferred embodiment provided by the present invention, both the white light emitting part 2 and the red light emitting part 1 are LED light sources, which can be surface-mounted or flip-chip LED chips (LED Chips), single LED Chip, or multiple LED Chips connected in series, parallel, or series-parallel, or have a general surface-mount package structure or a COB package structure LED chip. It is required that the maximum spectral intensity of the light emitted by the red light emitting part 1 is greater than the maximum spectral intensity of the light emitted by the white light emitting part 2. That is, in the spectrum of the synthesized second white light, the maximum spectral intensity is in the range of 600 nm to 780 nm. Although both the first white light and the second white light are white light, due to the addition of red light, there is a slight deviation in color between the two. They are below the black body locus BBL in the CIE1931 chromaticity diagram, but still belong to the category of white light.

[0040] The red light emitted by the red light generating unit 1 is mainly concentrated in the wavelength band greater than or equal to 600 nm and less than or equal to 780 nm. We already know that red light has a certain effect on improving night vigilance. However, in order to balance the lighting requirements, we cannot blindly increase the energy of this wavelength band. Through repeated experiments and verification, in this embodiment, the spectral radiant energy of the red light emitted by the red light generating unit 1 in the range of greater than or equal to 600 nm and less than or equal to 780 nm accounts for 30.0 - 50.0% of the total radiant energy of the second white light formed after mixing in the visible light region, that is, greater than or equal to 380 nm and less than or equal to 780 nm. Preferably, it is 36.0 - 48.0%. Although the red light between 600 nm and 780 nm in the entire red light wavelength band can improve vigilance, it is found through experiments that the proportion of red light in the wavelength band of 630 nm to 690 nm is more important. Therefore, it is better that the spectral radiant energy of the red light emitted by the red light generating unit 1 in the range of greater than or equal to 630 nm and less than or equal to 690 nm accounts for 15.0 - 40.0% of the total radiant energy of the second white light in the visible light region. Preferably, it is 18.0 - 35.0%. In this case, a red light source with a peak wavelength of the emitted light in the range of greater than or equal to 630 nm and less than or equal to 690 nm can be selected as the red light generating unit 1. Of course, the light emitted by the red light generating unit 1 may also exceed the range of 600 nm - 780 nm. However, since its main energy is concentrated in this wavelength band, the excess part has little impact on the entire spectrum. Here, we do not make specific limitations. As long as the energy in the range of 600 nm - 780 nm or 630 nm - 690 nm can meet the above requirements, it can achieve the effect of improving vigilance required by this application, and at the same time, it can ensure that the light color of the second white light meets the white light standard and will not overly affect indicators such as light color and color rendering. The color temperature of the second white light in this embodiment is in the range of 2500K - 6500K. As described above, due to the addition of red light, the correlated color temperature is below the blackbody locus BBL on the CIE1931 chromaticity diagram. Specifically, as Figure 2 shown, the distance Duv(BBL) from the blackbody locus on the CIE1931 chromaticity diagram is between (0.000, -0.015], preferably between [-0.003, -0.012].

[0041] Table 1 gives some optional red LED chips as the red light generating unit 1 in this embodiment for illustration. Of course, other red LED chips can also be selected as long as the final spectral energy distribution can meet the proportion requirements in this application. This application does not limit the LED selection of the red light generating unit 1. In Table 1, x and y represent the coordinate values of the light color of the emitted light of the red LED on the x and y axes of the CIE1931 color coordinate system. Peak represents the peak wavelength of the red LED, and Hw represents the half-width of the emission peak. The emission light spectra of each red LED are as Figure 3 shown.

[0042] Table 1

[0043] No Red light LED identification name x y Peak(nm) Hw(nm) 1 Red_LED1 0.6621 0.3338 616 22.4 2 Red_LED2 0.6920 0.3044 631 21.8 3 Red_LED3 0.7082 0.2911 644 15.6 4 Red_LED4 0.7108 0.2824 660 25.1

[0044] Regarding the selection of the self - light generating unit 2, in the existing technology, "blue - light technology" is usually adopted to generate self - light. By exciting one or more of green, yellow, and orange phosphors with a blue - light chip and combining them with blue light to form self - light. Since all self - light LEDs contain a blue - light chip, and the lamps provided in this application are mainly used for night work, the energy of the blue light cannot be too high to avoid affecting the secretion of melatonin. In this embodiment, the peak intensity of the light emitted by the blue - light chip in the self - light generating unit 2 is 20.0 - 98.0% of the peak intensity of the light emitted by the red - light generating unit 1, preferably 30.0 - 90.0%. The proportion of the spectral radiation energy of the light emitted by the blue - light chip in the range of greater than or equal to 430 nm to less than or equal to 470 nm in the total radiation energy of the second self - light in the visible - light region is 4.0 - 30.0%, preferably 8.0 - 20.0%.

[0045] Table 2 gives some specific selections of the optional self - light generating unit 2, where x and y represent the coordinate values of the light color of the light emitted by the red LED on the x - axis and y - axis in the CIE1931 color coordinate system, CCT is the color temperature, duv represents the distance and direction of the color deviation from the Planck locus in the color coordinate system, and CRI is the color - rendering index. The emission - light spectral diagrams of each self - light LED are as Figure 4 shown.

[0046] Table 2

[0047] No White light LED identification name x y CCT duv CRI 1 4000K_1 0.3818 0.3797 3986 0.001 82.2 2 5000K_1 0.3446 0.3554 5032 0.002 81.4 3 6500K_1 0.3123 0.3282 6532 0.003 76.2 4 5700K_2 0.3287 0.3417 5667 0.002 91.0 5 4000K_2 0.3756 0.3777 4141 0.002 98.2 6 5000K_2 0.3462 0.3580 4980 0.003 93.1

[0048] Select one red LED as the red - light generating unit 1 and one self - light LED as the self - light generating unit 2 from the above two tables respectively. When both are lit simultaneously, the second self - light can be obtained. Among them, 10 preferred embodiments are selected, and their specific selections and the characteristic parameters of the emitted light are shown in Table 3. Where x and y represent the coordinate values of the light color of the second self - light on the x - axis and y - axis in the CIE1931 color coordinate system, CCT is the color temperature, duv represents the distance and direction of the color deviation from the Planck locus in the color coordinate system, and CRI is the color - rendering index.

[0049] Table 3

[0050]

[0051] As can be seen from the above table, the selection of the white light generating part 2 has a greater impact on the second white light. Therefore, we prefer to choose white light LEDs with better color rendering, which can ensure that the color rendering index of the second white light emitted by the light source module of this application is above 80.0. At the same time, the main purpose of this application is to provide a light source for night work, and the color temperature should not be too high. Therefore, among the 10 preferred embodiments finally selected by us, white light LEDs with a relatively high color temperature are not selected, and the white light LED 6500K_1 in Table 2 is not selected in all embodiments.

[0052] In order to achieve the purpose of improving alertness required by this application, it is mainly achieved by the energy ratio of different bands. Table 4 lists the spectral characteristics of the second white light in Embodiments 1-10. The emission light spectrograms of the second white light of the lamps in Embodiments 1-10 are as Figures 5 - 14 shown. Among them, the total red light area energy ratio is the ratio of the spectral radiation energy in the section where the wavelength is greater than or equal to 600nm and less than or equal to 780nm to the total radiation energy of the second white light in the visible light region. The preferred red light area energy ratio is the ratio of the spectral radiation energy in the section where the wavelength is greater than 630nm and less than or equal to 690nm to the total radiation energy of the second white light in the visible light region. The blue light area energy ratio is the ratio of the spectral radiation energy in the section where the wavelength is greater than or equal to 430nm and less than or equal to 470nm to the total radiation energy of the second white light in the visible light region. The relative blue light intensity refers to the relative peak intensity of the peak of the light in the spectrum of the second white light.

[0053] Table 4

[0054]

[0055] As can be seen from the above table, the color temperature of the second white light is 2500K to 6500K. The distribution diagrams of the preferred embodiments on the CIE1931 chromaticity diagram are as Figure 2 shown. They are all located below the black body locus BBL, and Duv is between (0.000, -0.015], preferably between [-0.003, -0.012]. The energy ratio of each region meets the description in the foregoing embodiments. The energy of the red light region is increased in the ordinary white light source, but the specific energy ratio is limited to less than 50%, which can meet the balanced requirements of the work efficiency and rhythm stimulation of the staff at night and is especially suitable for night workers.

[0056] In this embodiment, an isolation structure is further provided between the red light generating part 1 and the white light generating part 2, specifically an isolation cover 4. The isolation cover 4 and the chassis 6 have the same opening direction, and the red light generating part 1 is arranged inside the isolation cover 4. The white light generating part 2 is arranged inside the chassis 6 outside the isolation cover 4.

[0057] The foregoing description of the preferred embodiments of the present application is for purposes of illustration and description and is not intended to be exhaustive or to limit the application to the specific forms disclosed. Obviously, many modifications and variations are possible and would be apparent to those skilled in the art and should be included within the scope of the invention as defined by the appended claims.

Claims

1. A lighting fixture, comprising a lamp body and a light-emitting source disposed within the lamp body, characterized in that, The light source includes a white light generating part and a red light generating part. The white light generating part emits blue light through a blue light chip and excites a variety of phosphors to emit a first white light. The light emitted by the red light generating part through a red LED chip is red light with a peak wavelength in the range of greater than or equal to 600 nm to less than or equal to 780 nm. The peak intensity of the blue light is 20.0 to 98.0% of the peak intensity of the red light. The lamp only lights up the white light generating part to emit the first white light in the first working mode, and lights up both the white light generating part and the red light generating part to emit a second white light for night work use in the second working mode. The illuminance of the second white light is lower than that of the first white light. The spectral radiant energy of the red light accounts for 30.0 to 50.0% of the total radiant energy of the second white light formed after mixing in the visible light region. The lamp further includes a controller. The controller is electrically connected to the white light generating part and controls the output power of the white light generating part through a first parameter. The controller is electrically connected to the red light generating part and controls the output power of the red light generating part through a second parameter. The controller controls the lighting of the red light generating part according to a preset switching time to switch the lamp from the first working mode to the second working mode.

2. The luminaire according to claim 1, characterized in that, The controller controls the overall illuminance of the lamp to be maintained between 250 and 450 lux in the second working mode.

3. The luminaire according to claim 2, characterized in that, In the first working mode, the illuminance of the lamp is maintained between 500 and 1000 lux. When the controller controls the lighting of the red light generating part, the controller makes the overall illuminance of the lamp change from bright to dark by controlling and changing the first parameter and the second parameter.

4. The luminaire according to claim 2, characterized in that, The controller includes a clock module. The switching time is preset in the clock module. The switching time is a certain moment within the range of 17:00 - 19:00 every afternoon or within the range of ±1 h of the local sunset time.

5. The luminaire according to claim 1, characterized in that, The first parameter and the second parameter are current values, voltage values or PWM signals.

6. The luminaire according to claim 1, characterized in that, The lamp further includes an isolation structure. The isolation structure is arranged in the lamp body. The red light generating part is arranged inside the isolation structure, and the white light generating part is arranged inside and outside the isolation structure.

7. The luminaire according to any one of claims 1-6, characterized in that, In the second working mode, the spectral radiant energy of the light emitted by the red light generating part in the range of greater than or equal to 600 nm to less than or equal to 780 nm accounts for 36.0 to 48.0% of the total radiant energy of the second white light formed after mixing in the visible light region, that is, in the range of greater than or equal to 380 nm to less than or equal to 780 nm.

8. The luminaire according to any one of claims 1 to 6, characterized in that, The color temperature of the second white light is 2500K - 6500K, and the distance Duv between the positions on the CIE1931 chromaticity diagram located between the black body locus BBL is between (0.000, -0.015].

9. The luminaire according to claim 8, characterized in that, The distance Duv between the second white light and the black body locus BBL on the CIE1931 chromaticity diagram is between [-0.003, -0.012].

10. The luminaire according to any one of claims 1-6, characterized in that, The color rendering indices of the first white light and the second white light are above 80.0.

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