Sunset glow spectrum-based LED and preparation method therefor

Abstract

The present invention relates to the technical field of LEDs, and in particular to a sunset glow spectrum-based LED and a preparation method therefor. The sunset glow spectrum-based LED comprises a plurality of LED chips, a frame, silicone and a phosphor encapsulant. A reflector cup and positive and negative electrodes are arranged on the frame; the LED chips are all arranged in the reflector cup, and are connected to the positive and negative electrodes by means of gold wire bonding; the phosphor encapsulant covers the LED chips; the LED chips include a first LED chip, a second LED chip and a third LED chip; and the phosphor encapsulant is formed by preparing a 1600K phosphor encapsulant solution and is formed by mixing an adhesive with green phosphor, red phosphor and infrared phosphor. The sunset glow spectrum-based LED of the present invention has color quality meeting the requirement that an S / P ratio and an M / P ratio are lower than sunlight having the same color temperature, color temperature meeting specified standard chromaticity coordinates, chromaticity coordinates meeting 3-standard deviation of color matching, spectral similarity index (SSI) relative to the 1600K solar spectrum being greater than 93%, and blue light hazard efficiency KB,V equal to 0.00004, and conforms to RG0 blue light hazard exemption standard.

Description

Solar sunset spectrum LEDs and their preparation methods Technical Field

[0001] This invention relates to the field of LED technology, and in particular to solar sunset spectrum LEDs and their preparation methods. Background Technology

[0002] Research has revealed that insufficient sleep duration is not the only factor influencing obesity. A several-week sleep study conducted by exercise science experts at Brigham Young University, involving female students from two universities in the western United States, yielded the following three conclusions: First, consistent bedtime and wake-up time effectively inhibits weight gain; second, sleep duration of less than 6.5 hours or more than 8.5 hours leads to weight gain; and third, sleep quality affects weight. Obesity is a contributing factor to cardiovascular disease, and it also affects digestive and endocrine system function, increases the risk of cancer, and causes numerous inconveniences in daily life. Furthermore, obesity can lead to soft tissue injuries, decreased fertility, psychological disorders, heart disease, diabetes, atherosclerosis, fatty liver, gallstones, edema, and gout. In other words, improving sleep quality can effectively reduce the probability of obesity. Currently, there are no studies on using LED light sources to improve sleep quality. Summary of the Invention

[0003] The purpose of this invention is to provide a solar sunset spectrum LED and its preparation method, which simulates the sunset spectrum by providing a special LED light source, thereby improving sleep quality and reducing the probability of obesity. This can at least solve one of the problems of the prior art mentioned above.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: providing a solar sunset spectrum LED, including multiple LED chips, a bracket, silicone and phosphor, wherein the bracket has a cup and positive and negative electrodes, the multiple LED chips are disposed in the cup, and each LED chip is connected to the positive and negative electrodes by gold wire bonding, and the phosphor is coated on each LED chip;

[0005] Among them, the plurality of LED chips include a first LED chip with a main wavelength of 440-445nm, a second LED chip with a main wavelength of 450-455nm, and a third LED chip with a main wavelength of 465-470nm;

[0006] The fluorescent adhesive is formed by preparing a 1600K fluorescent adhesive solution, which is formed by mixing adhesive with green phosphor with an emission wavelength of 530-540nm, red phosphor with an emission wavelength of 630-640nm, red phosphor with an emission wavelength of 655-665nm, infrared phosphor with an emission wavelength of 725-735nm, and infrared phosphor with an emission wavelength of 795-805nm.

[0007] Optionally, the ratio of the bare-chip peak spectral energy of the first LED chip, the second LED chip, and the third LED chip is: Ф e (440-445nm): Ф e (450-455nm): Ф e (475-485nm)=(0.4-0.7): (0.8-1.0): (0.6-1.0).

[0008] Optionally, the 1600K fluorescent adhesive solution is prepared by mixing adhesive, green phosphor with an emission wavelength of 535nm, red phosphor with an emission wavelength of 635nm, red phosphor with an emission wavelength of 660nm, infrared phosphor with an emission wavelength of 730nm, and infrared phosphor with an emission wavelength of 800nm ​​in a ratio of 3:(3.5-4.0):(0.5-0.7):(0.7-1.0):(1.8-2.2):(0.9-1.1).

[0009] Optionally, the green powder with an emission wavelength of 530-540nm is Lu3Al5O. 12 :Ce 3+ Composition: The red phosphor with an emission wavelength of 635-645nm is CaAlSiN3:Eu; the red phosphor with an emission wavelength of 655-665nm is CaAlSiN3:Eu; the infrared phosphor with an emission wavelength of 725-735nm is Ga4GeO8:Cr. 3+ Composition; the infrared phosphor with an emission wavelength of 795-805nm is Ga4GeO8:Cr 3+ Element.

[0010] Optionally, the color quality of the solar sunset spectrum LED satisfies the following relative spectral height:

[0011] 650-800nm ​​≥ 0.4;

[0012] The peak wavelength is between 700-730nm.

[0013] Optionally, the light color quality of the solar sunset spectrum LED satisfies the requirement that the spectrum is continuous from 350-800nm ​​and the energy level at 650-730nm is >0.6.

[0014] Optionally, the light color quality of the solar sunset spectrum LED satisfies the requirement that there is a small peak in the 700-800nm ​​spectrum and the peak wavelength is in the 700-740nm range.

[0015] This invention also provides a method for preparing a solar sunset spectrum LED, which includes the following steps:

[0016] S100: The first LED chip, the second LED chip, and the third LED chip are placed inside the bowl and fixed on the support by die bonding machine using insulating glue or silver glue. After die bonding, the first LED chip, the second LED chip, and the third LED chip are baked in an oven at 150-160℃ for 2 hours ± 10 minutes to completely fix the first LED chip, the second LED chip, and the third LED chip inside the bowl.

[0017] S200: The first LED chip, the second LED chip, and the third LED chip are connected to the positive and negative electrodes by gold wire bonding using a gold wire bonding machine;

[0018] S300: Prepare a 1600K fluorescent adhesive solution, wherein the 1600K fluorescent adhesive solution is a mixture of adhesive and green powder, red powder and infrared fluorescent powder;

[0019] S400: Pour the prepared 1600K fluorescent adhesive solution into the glue tank of the dispensing machine. After the glue and bubbles are removed, dispense the 1600K fluorescent adhesive solution into the cup according to the color parameters. After dispensing, bake at 80℃ / 0.5H+160℃ / 4H.

[0020] S500: After the LEDs have been baked and threshed, they are spectroscopically analyzed using a spectrophotometer according to the given color parameters. The color quality of the light formed in the bowl is such that the S / P ratio and M / P ratio are lower than those of sunlight at the same color temperature, the color temperature meets the specified chromaticity standard coordinates, the chromaticity coordinates meet the 3rd order color tolerance chromaticity standard, the SSI coefficient of similarity to the 1600K solar spectrum is >93%, and the blue light hazard efficiency K0 is also specified. B，V =0.00004, the same as the K of sunlight with the same color temperature. B,V (Blue light hazard efficiency) is low, meeting the blue light exemption RG0 standard.

[0021] Compared with existing technologies, the solar sunset spectrum LED structure of this invention can simulate the solar sunset spectrum. Its S / P ratio (slight-to-light ratio) is 8.82% lower than that of sunlight at the same color temperature of 1600K, which is conducive to relaxing the eyes and creating a comfortable and healthy light environment. Its M / P ratio (non-light ratio) is 10.05% lower than that of sunlight at the same color temperature of 1600K, which promotes melatonin secretion, prolongs deep sleep time, and promotes metabolism. The activation energy of cytochrome C oxidase accounts for more than 57%, which can better promote metabolism, thereby providing ATP energy supply for weight loss and thus playing a role in weight loss and fat reduction. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of the solar sunset spectrum LED provided in an embodiment of the present invention.

[0023] Figure 2 is a cross-sectional view of the solar sunset spectrum LED provided in an embodiment of the present invention.

[0024] Figure 3 is a graph of the light emission spectrum of a solar sunset LED bare crystal provided in an embodiment of the present invention.

[0025] Figure 4 is a graph of the emission spectrum of the solar sunset spectrum LED provided in an embodiment of the present invention.

[0026] Figure 5 is a comparison diagram of the solar sunset spectrum LED emission and the solar spectrum at 1600K provided in the embodiment of the present invention.

[0027] Figure 6 shows the solar sunset spectrum LED and the 1600KK solar spectrum provided in the embodiment of the present invention. B,V (Blue light hazard efficiency) comparison table.

[0028] Figure 7 is the SSI (350-830nm) test report of the solar sunset spectrum LED provided in the embodiment of the present invention.

[0029] Figure 8 is a test report of the solar sunset spectrum LED provided in an embodiment of the present invention.

[0030] Figure 9 is a test report for the medical aesthetics project of the solar sunset spectrum LED provided in the embodiment of the present invention.

[0031] Figure 10 shows the chromaticity bin diagram requirements for the solar sunset spectrum LED provided in the embodiment of the present invention.

[0032] Figure reference numerals: 10—Positive and negative electrodes; 11—First LED chip; 12—Second LED chip; 13—Third LED chip; 14—Bowl / cup; 15—Support; 16—Fluorescent adhesive. Detailed Implementation

[0033] The technical solution of the present invention will be further described in detail below with reference to Figures 1-10. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. Although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the various embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0034] As shown in Figures 1 and 2, this embodiment of the invention provides a solar sunset spectrum LED, comprising multiple LED chips, a support 15, silicone, and phosphor 16. The support 15 has a cup 14 and positive and negative electrodes 10. The multiple LED chips are disposed within the cup 14 and connected to the positive and negative electrodes 10 by gold wire bonding. The phosphor 16 covers each LED chip. The multiple LED chips can be connected in series or in parallel.

[0035] The plurality of LED chips include a first LED chip 11 with a main wavelength of 440-445nm, a second LED chip 12 with a main wavelength of 450-455nm, and a third LED chip 13 with a main wavelength of 465-470nm.

[0036] The fluorescent adhesive 16 is formed by preparing a 1600K fluorescent adhesive solution, which is formed by mixing adhesive with green phosphor with an emission wavelength of 530-540nm, red phosphor with an emission wavelength of 630-640nm, red phosphor with an emission wavelength of 655-665nm, infrared phosphor with an emission wavelength of 725-735nm, and infrared phosphor with an emission wavelength of 795-805nm.

[0037] The light color quality of the solar sunset spectrum LED provided in this embodiment of the invention meets the following requirements: the S / P ratio and M / P ratio are lower than those of sunlight at the same color temperature; the color temperature meets the specified chromaticity standard coordinates; the chromaticity coordinates meet the third-order color tolerance chromaticity standard; the SSI coefficient with 1600K solar spectrum is >93%; and the blue light hazard efficiency K B，V =0.00004, the same as the K of sunlight with the same color temperature. B,V (Blue light hazard efficiency) is low, meeting the blue light exemption RG0 standard.

[0038] It should be noted that the blue light hazard efficiency K can be used. B，V To perform the calculation, namely the blue light hazard weighted radiance L B The ratio of the photometric value to the corresponding photometric value is calculated using the following formula:

[0039] Among them, K m =683 lm / W, V(λ) is the spectral luminous efficiency (or visibility function), and B(λ) is the blue light hazard weighting function. K B，V K represents the relative amount of blue light component in visible radiation. Under the condition of the same brightness in lighting products, K... B，V The higher the light source, the greater the potential for damage to the retina.

[0040] In one embodiment of the present invention, the ratio of the peak spectral energy of the bare crystal of the first LED chip 11, the second LED chip 12, and the third LED chip 13 is: Ф e (440-445nm): Ф e (450-455nm): Ф e (475-485nm) = 0.4:0.8:0.6, or 0.7:1.0:1.0, or 0.5:0.9:0.8.

[0041] In one embodiment of the present invention, the 1600K fluorescent adhesive solution is prepared by mixing adhesive, green phosphor with an emission wavelength of 535nm, red phosphor with an emission wavelength of 635nm, red phosphor with an emission wavelength of 660nm, infrared phosphor with an emission wavelength of 730nm, and infrared phosphor with an emission wavelength of 800nm ​​in a ratio of 3:3.5:0.5:0.7:1.8:0.9, or red phosphor with an emission wavelength of 660nm, or infrared phosphor with an emission wavelength of 730nm, or infrared phosphor with an emission wavelength of 800nm. This allows the light color of the solar sunset spectrum LED to effectively meet the given color parameter requirements.

[0042] Preferably, the green powder with an emission wavelength of 530-540nm is Lu3Al5O. 12 :Ce 3+ Composition: The red phosphor with an emission wavelength of 635-645nm is CaAlSiN3:Eu; the red phosphor with an emission wavelength of 655-665nm is CaAlSiN3:Eu; the infrared phosphor with an emission wavelength of 725-735nm is Ga4GeO8:Cr. 3+ Composition; the infrared phosphor with an emission wavelength of 795-805nm is Ga4GeO8:Cr 3+ Element.

[0043] The light color quality of the solar sunset spectrum LED in this embodiment of the invention meets the requirements of a relative spectral height of 650-800nm ​​≥ 0.4 and a peak wavelength of 700-730nm.

[0044] Furthermore, the light color quality of the solar sunset spectrum LED in this embodiment of the invention also satisfies the requirement of a continuous spectrum from 350-800nm, and an energy level >0.6 at 650-730nm. Thus, the LED helps protect the eyes by activating large molecules in the eyes to convert into small water molecules, thereby providing eye moisturizing and protection effects.

[0045] Furthermore, the light color quality of the solar sunset spectrum LED in this embodiment of the invention also satisfies the requirement that there is a small peak in the 700-800nm ​​spectrum with a peak wavelength of 700-740nm. Thus, the LED provides micro-infrared light stimulation, inhibiting axial elongation and thereby achieving the effect of myopia prevention and control, resulting in healthier eye health.

[0046] This invention also provides a method for preparing a solar sunset spectrum LED, which includes the following steps:

[0047] Step S100: The first LED chip 11, the second LED chip 12 and the third LED chip 13 are placed in the bowl 14 and fixed on the bracket 15 with insulating glue or silver glue using a die bonder. After die bonding, the first LED chip 11, the second LED chip 12 and the third LED chip 13 are baked in an oven at 150-160℃ for 2 hours ± 10 minutes to completely fix the first LED chip 11, the second LED chip 12 and the third LED chip 13 in the bowl 14.

[0048] Step S200: The first LED chip 11, the second LED chip 12 and the third LED chip 13 are connected to the positive and negative electrodes 10 by using a gold wire bonding machine.

[0049] Step S300: Prepare a 1600K fluorescent adhesive solution, wherein the 1600K fluorescent adhesive solution is a mixture of adhesive and green powder, red powder and infrared fluorescent powder;

[0050] Step S400: Pour the prepared 1600K fluorescent adhesive solution into the glue tank of the dispensing machine. After the glue and bubbles are removed, dispense the 1600K fluorescent adhesive solution into the cup 14 according to the color parameters. After dispensing, bake at 80℃ / 0.5H+160℃ / 4H.

[0051] Step S500: After the LEDs have been baked and threshed, they are spectroscopically analyzed using a spectrophotometer according to the given color parameters. The light color quality formed in the bowl 14 is ensured to meet the following requirements: the S / P ratio and M / P ratio are lower than those of sunlight at the same color temperature; the color temperature meets the specified chromaticity standard coordinates; the chromaticity coordinates meet the 3rd order color tolerance chromaticity standard; the SSI coefficient of similarity to the 1600K solar spectrum is >93%; and the blue light hazard efficiency K0 is low. B，V =0.00004, the same as the K of sunlight with the same color temperature. B,VLow blue light hazard efficiency, meeting the RG0 blue light exemption standard. A healthier eye-protecting spectrum.

[0052] Figure 10 shows the chromaticity bin diagram requirements for the solar sunset spectrum LED product provided in this embodiment of the invention.

[0053] Furthermore, the comparison between the solar sunset spectrum LED prepared by the above preparation method in this embodiment and sunlight can be reflected according to the following four tables.

[0054] Table 1 is a spectral content analysis table of the solar sunset spectrum LED provided in the embodiment.

[0055] Table 1

[0056] Table 2 compares the S / P ratio and M / P ratio of the solar sunset spectrum LED provided in the embodiments of the present invention with those of 1600K sunlight.

[0057] Table 2

[0058] Table 3 shows the spectroscopic parameters of the solar sunset spectrum LED provided in the embodiments of the present invention.

[0059] Table 3

[0060] Furthermore, the results of the photobiological hazard type test (IEC 62471:2006) for the solar sunset spectrum LED of this embodiment of the invention can be shown in Table 4 below:

[0061] Table 4

[0062] Furthermore, the following human experiments were conducted on the solar sunset spectrum LED of this embodiment of the invention:

[0063] A. Control group 1: Ra80, spectral LED with a color temperature of 1600K;

[0064] B. Control group 2: No lights on;

[0065] C. Experimental Group: Solar sunset spectrum LED provided in the embodiments of the present invention;

[0066] Among these measures, the ambient illuminance of the lamps was kept consistent (200 lx); and the lamps were turned on for 12 hours each night, with the same person participating in the experiment.

[0067] The experimental results are as follows

[0068] Data collection:

[0069] 1. Weight before bed and weight after bed;

[0070] 2. Sleep duration (percentage of deep sleep).

[0071] The experimental results are as follows:

[0072] The results for Group A are shown in Table 5:

[0073] The details for Group B are shown in Table 6.

[0074] Table 6

[0075] The experimental group's situation is shown in Table 7:

[0076] Table 7

[0077] The data above shows that the experimental group experienced significant improvements in both weight change and deep sleep.

[0078] Therefore, the solar sunset spectrum LED and its preparation method provided in the embodiments of the present invention have at least the following beneficial effects:

[0079] 1. With a spectral similarity SSI (350-830nm) of >93 with 1600K sunlight, this excellent spectral similarity parameter reproduces the color of natural light, allowing people to experience nature and enjoy the sunshine.

[0080] 2.K B,V (Blue light hazard efficiency) = 0.00004, which is the same as the Kelvin efficiency of sunlight with the same color temperature. B,V (Blue light hazard efficiency) Low (K) B,V / K B,V (1600K sunlight) = 60.67%, meeting the blue light exemption RG0 standard, providing a healthier eye-protecting spectrum;

[0081] 3. The 350-500nm spectral content is <0.5%, which meets the requirements of the Sky Glow Plan and protects the light health of the ecological environment;

[0082] 4. The 650-700nm spectral height is above 0.7, and the peak wavelength is between 700-740nm. The superior spectral continuity helps to inhibit the growth of the axial length of the eye, thus achieving the function of myopia protection.

[0083] 5. The S / Pratio (dark-to-light visual luminance ratio) is 8.82% lower than that of sunlight at the same color temperature of 1600K, which helps the eyes relax their field of vision and creates a comfortable and healthy light environment;

[0084] 6. The M / P ratio (non-photometric brightness ratio) is 10.05% lower than that of sunlight at the same color temperature of 1600K, which promotes melatonin secretion, prolongs deep sleep time, promotes metabolism, and thus helps with weight loss.

[0085] 7. The spectrum is continuous from 350-800nm, and the energy level of 650-730nm is >0.7, which helps protect the eyes and activates the conversion of large molecules in the eyes into small water molecules, thereby achieving the effect of moisturizing and protecting the eyes;

[0086] 8. The 700-800nm ​​spectrum has small peaks with peak wavelengths between 700-740nm, which provide micro-infrared light stimulation, inhibiting axial elongation and thus achieving the effect of myopia prevention and control, protecting eyesight better;

[0087] 9. Compared to conventional LEDs with the same color temperature, objects appear clearer and the field of view is superior;

[0088] 10. Cytochrome C oxidase activity accounts for more than 57% of the activated energy, which can better promote metabolism, thereby providing ATP energy supply for weight loss and thus playing a role in weight loss and fat reduction.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solar-light sunset spectrum LED, characterized in that: The device includes multiple LED chips, a support frame, silicone, and phosphor adhesive. The support frame has a cup and positive and negative electrodes. The multiple LED chips are disposed in the cup and connected to the positive and negative electrodes by gold wire bonding. The phosphor adhesive is coated on each LED chip. Among them, the plurality of LED chips include a first LED chip with a main wavelength of 440-445nm, a second LED chip with a main wavelength of 450-455nm, and a third LED chip with a main wavelength of 465-470nm; The fluorescent adhesive is formed by preparing a 1600K fluorescent adhesive solution, which is formed by mixing adhesive with green phosphor with an emission wavelength of 530-540nm, red phosphor with an emission wavelength of 630-640nm, red phosphor with an emission wavelength of 655-665nm, infrared phosphor with an emission wavelength of 725-735nm, and infrared phosphor with an emission wavelength of 795-805nm. The 1600K fluorescent adhesive solution is prepared by mixing adhesive, green phosphor with an emission wavelength of 535nm, red phosphor with an emission wavelength of 635nm, red phosphor with an emission wavelength of 660nm, infrared phosphor with an emission wavelength of 730nm, and infrared phosphor with an emission wavelength of 800nm ​​in a ratio of 3:(3.5-4.0):(0.5-0.7):(0.7-1.0):(1.8-2.2):(0.9-1.1).

2. The solar sunset spectrum LED according to claim 1, characterized in that: The ratio of the peak spectral energy of the first, second, and third LED chips is: Ф e (440-445nm): Ф e (450-455nm): Ф e (475-485nm)=(0.4-0.7): (0.8-1.0): (0.6-1.0).

3. The solar sunset spectrum LED according to claim 1, characterized in that: The green powder with an emission wavelength of 530-540nm is Lu3Al5O 12 :Ce 3+ Element; The red powder with an emission wavelength of 635-645nm is composed of CaAlSiN3:Eu. The red powder with an emission wavelength of 655-665nm is composed of CaAlSiN3:Eu. The infrared phosphor with an emission wavelength of 725-735nm is Ga4GeO8:Cr 3+ Element; The infrared phosphor with an emission wavelength of 795-805nm is Ga4GeO8:Cr 3+ Element.

4. The solar sunset spectrum LED according to claim 1, characterized in that: The light color quality of the solar sunset spectrum LED meets the following relative spectral height requirement: 650-800nm ​​≥ 0.4; The peak wavelength is between 700-730nm.

5. The solar sunset spectrum LED according to claim 1, characterized in that: The light color quality of the solar sunset spectrum LED meets the requirements of a continuous spectrum from 350-800nm ​​and an energy level of >0.6 at 650-730nm.

6. The solar sunset spectrum LED according to claim 1, characterized in that: The light color quality of the solar sunset spectrum LED meets the requirement that there is a small peak in the 700-800nm ​​spectrum and the peak wavelength is between 700-740nm.

7. A method for preparing a solar sunset spectrum LED according to any one of claims 1 to 6, characterized in that: Includes the following steps: S100: The first LED chip, the second LED chip, and the third LED chip are placed inside the bowl and fixed on the support by die bonding machine using insulating glue or silver glue. After die bonding, the first LED chip, the second LED chip, and the third LED chip are baked in an oven at 150-160℃ for 2 hours ± 10 minutes to completely fix the first LED chip, the second LED chip, and the third LED chip inside the bowl. S200: The first LED chip, the second LED chip, and the third LED chip are connected to the positive and negative electrodes by gold wire bonding using a gold wire bonding machine; S300: Prepare a 1600K fluorescent adhesive solution, wherein the 1600K fluorescent adhesive solution is a mixture of adhesive and green powder, red powder and infrared fluorescent powder; S400: Pour the prepared 1600K fluorescent adhesive solution into the glue tank of the dispensing machine. After the glue and bubbles are removed, dispense the 1600K fluorescent adhesive solution into the cup according to the color parameters. After dispensing, bake at 80℃ / 0.5H+160℃ / 4H. S500: After the LEDs have been baked and threshed, they are spectroscopically analyzed using a spectrophotometer according to the given color parameters. The color quality of the light formed in the bowl is such that the S / P ratio and M / P ratio are lower than those of sunlight at the same color temperature, the color temperature meets the specified chromaticity standard coordinates, the chromaticity coordinates meet the 3rd order color tolerance chromaticity standard, the SSI coefficient of similarity to the 1600K solar spectrum is >93%, and the blue light hazard efficiency K0 is also specified. B，V =0.00004, the blue light hazard efficiency K of sunlight with the same color temperature. B,V Low, meeting the blue light exemption RG0 standard.

Images