CN101808452B - Method for acquiring high color rendering LED white light by using combination of white light LED and red light LED - Google Patents
Method for acquiring high color rendering LED white light by using combination of white light LED and red light LED Download PDFInfo
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- CN101808452B CN101808452B CN2010101324635A CN201010132463A CN101808452B CN 101808452 B CN101808452 B CN 101808452B CN 2010101324635 A CN2010101324635 A CN 2010101324635A CN 201010132463 A CN201010132463 A CN 201010132463A CN 101808452 B CN101808452 B CN 101808452B
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Abstract
The invention relates to a method for acquiring high color rendering LED white light by using combination of a white light LED and a red light LED. The method is implemented by the white light LED, the red light LED and a control circuit. The white light LED consists of a blue light chip, yellow fluorescent powder and green fluorescent powder, wherein the total fluorescence color coordinates generated by mixing the yellow fluorescent powder and the green fluorescent powder are determined by the white light color temperature of the needed LED combination, so a white light LED which has high light efficiency and given spectrum distribution is obtained. The high color rendering LED white light of which the luminous flux can be adjusted and both the general color rendering index Ra and the special color rendering index R9 are both greater than 90 at the needed white light color temperature can be obtained by selecting the combination of the white light LED and the red light LED which have different given spectrum distribution according to the needed LED combination white light color temperature, and supplying different drive currents to the white light LED and the red light LED by the control circuit according to different requirements of different needed luminous flux.
Description
Technical field
The present invention relates to LED white light technical field, particularly relate to a kind of white light that uses and add the method that the red-light LED combination obtains high light efficiency high-color development LED white light.
Background technology
Along with the birth of blue-light LED chip and corresponding red fluorescence powder, yellow fluorescent powder and green emitting phosphor, white light LEDs has obtained developing rapidly.Yet the color rendering of this white light LEDs is not high, its color rendering index Ra is generally lower than 85.In order to improve color rendering index, needing increases red fluorescence powder, but has significantly reduced its light efficiency, is difficult to obtain practical application.Therefore, proposed red-light LED or chip and substituted red fluorescence powder, with the method for white light LEDs combination results white light, realized high colour developing white light, but that white light departs from black body locus is larger, dC>0.01, its special colour rendering index R in 2700K to 6500K reference color temperature
9still lower, reality visually color rendering is not very good, therefore requires further improvement, and realizes in 2700K to 6500K reference color temperature general colour rendering index Ra and special colour rendering index R
9all be greater than 90 high light efficiency high-color development LED white light.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of white light that uses and adds the method that the red-light LED combination obtains the high-color development LED white light, obtains general colour rendering index Ra and special colour rendering index R in 2700K～6500K reference color temperature
9all be greater than 90 high light efficiency high-color development LED white light.
The technical solution adopted for the present invention to solve the technical problems is: provide a kind of white light that uses to add the method that the red-light LED combination obtains the high-color development LED white light, comprise the following steps:
(1) according to the relative spectral power distribution of blue chip, yellow fluorescent powder, green emitting phosphor and red-light LED, determine by analogue simulation that blue chip under required LED combination white light colour temperature excites the remaining blue light of yellow-green fluorescence powder, yellow fluorescent powder to be excited gold-tinted, green glow that green emitting phosphor is excited and the logical percentage of light of ruddiness, thereby determine that described yellow fluorescent powder and green emitting phosphor mix the chromaticity coordinates scope that produces total fluorescence under described required LED combination white light colour temperature, and the reference color temperature of white light LEDs;
(2) select corresponding white light LEDs under described required LED combination white light colour temperature to form the white light LEDs independent loop, and connect with the white light control circuit; Select red-light LED to form the red-light LED independent loop, and connect with the ruddiness control circuit; Wherein, the white light of described white light LEDs excites described yellow fluorescent powder and green emitting phosphor to produce by described blue chip;
(3), according to the logical requirement of the gentle light of described required LED combination white color, determine that the light of white light LEDs independent loop and red-light LED independent loop is logical;
(4) relation of and drive current logical according to the light of white light LEDs independent loop and red-light LED independent loop, determine the drive current of white light LEDs independent loop and red-light LED independent loop;
(5) by corresponding control circuit, provide definite drive current to white light LEDs independent loop and red-light LED independent loop respectively, thereby obtain the high-color rendering white-light of required colour temperature.
The peak wavelength that described use white light adds the blue chip described in the method that red-light LED combination obtains the high-color development LED white light is 450～470nm; The peak wavelength of described yellow fluorescent powder is 560～600nm; The peak wavelength of described green emitting phosphor is 510～550nm.
The peak wavelength that described use white light adds the blue chip described in the method that red-light LED combination obtains the high-color development LED white light is 455～465nm more preferably; The peak wavelength of described yellow fluorescent powder is 575～585nm more preferably; The peak wavelength of described green emitting phosphor is 525～535nm more preferably.
The peak wavelength that described use white light adds the red-light LED described in the method that red-light LED combination obtains the high-color development LED white light is 620～640nm.
The peak wavelength that described use white light adds the red-light LED described in the method that red-light LED combination obtains the high-color development LED white light is 625～635nm more preferably.
The scope that described use white light adds the required LED combination white light colour temperature described in the method that red-light LED combination obtains the high-color development LED white light is 2700K～6500K; Wherein, for the LED combination white light of required 2580K～2870K colour temperature, the colour temperature of white light LEDs is 4300K～4630K, and it is u=0.2001 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3761, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 2871K～3220K colour temperature, the colour temperature of white light LEDs is 4631K～4980K, and it is u=0.1953 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3763, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 3221K～3710K colour temperature, the colour temperature of white light LEDs is 4981K～5480K, and it is u=0.1901 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3766, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 3711K～4260K colour temperature, the colour temperature of its white light LEDs is 5481K～6110K, and it is u=0.1855 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3768, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 4261K～4745K colour temperature, the colour temperature of its white light LEDs is 6111K～6670K, and it is u=0.1817 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3770, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 4746K～5310K colour temperature, the colour temperature of its white light LEDs is 6671K～7300K, and it is u=0.1788 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3771, and the chromaticity coordinates scope is dC<0.01; For the LED of required 5311K～6020K colour temperature combination white light, its white light LEDs colour temperature be 7301K～8120K, it is u=0.1718 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3774, the chromaticity coordinates scope is dC<0.01; For the LED of required 6021K～7040K colour temperature combination white light, its white light LEDs colour temperature be 8121K～9200K, it is u=0.1693 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3776, the chromaticity coordinates scope is dC<0.01.
Described use white light adds the high-color rendering white-light described in the method that red-light LED combination obtains the high-color development LED white light and is undertaken by described white light control circuit and/or ruddiness control circuit that light is logical to be regulated.
Described use white light adds the white light LEDs independent loop described in the method that red-light LED combination obtains the high-color development LED white light to carry out serial or parallel connection or string mixing by one or at least two white light LEDs and connects to form; Described red-light LED independent loop carries out serial or parallel connection or string mixing by one or at least two red-light LEDs and connects to form.
Describedly add a several size logical according to described required LED combination white light light of the white light LEDs described in the method that red-light LED combination obtains the high-color development LED white light and red-light LED and single white light LEDs and red-light LED with white light and determine in the maximum of rated power.
Beneficial effect
Owing to having adopted above-mentioned technical scheme, the present invention compared with prior art, there is following advantage and good effect: utilize Colored light mixing addition principle and color rendering properties of light source evaluation method, carry out analogue simulation by the yellow spectrum of the blue spectrum to blue chip, yellow fluorescent powder, the green spectrum of green emitting phosphor and the combination of red-light LED spectrum, be met under required LED combination white light colour temperature LED white light general colour rendering index Ra and special colour rendering index R
9all be greater than 90 white light LEDs and the combination of red-light LED, and determined the chromaticity coordinates scope that combines reference color temperature, yellow fluorescent powder and the total fluorescence of green emitting phosphor mixing generation of white light LEDs under the white light colour temperature at required LED, thereby obtain the LED white light of the high colour developing of high light efficiency.Because white light LEDs is not used red fluorescence powder, therefore, its light efficiency is higher.
The accompanying drawing explanation
Fig. 1 is control circuit of the present invention and LED loop connection diagram;
Fig. 2 is the relative spectral power distribution schematic diagram of blue chip;
Fig. 3 is the fluorescence relative spectral power distribution schematic diagram of yellow fluorescent powder;
Fig. 4 is the fluorescence relative spectral power distribution schematic diagram of green emitting phosphor;
Fig. 5 is the relative spectral power distribution schematic diagram of red-light LED;
Fig. 6 is the relative spectral power distribution schematic diagram that colour temperature is the 4586K white light LEDs;
Fig. 7 is the relative spectral power distribution schematic diagram that colour temperature is the 4848K white light LEDs;
Fig. 8 is the relative spectral power distribution schematic diagram that colour temperature is the 5365K white light LEDs;
Fig. 9 is the relative spectral power distribution schematic diagram that colour temperature is the 5931K white light LEDs;
Figure 10 is the relative spectral power distribution schematic diagram that colour temperature is the 6522K white light LEDs;
Figure 11 is the relative spectral power distribution schematic diagram that colour temperature is the 7165K white light LEDs;
Figure 12 is the relative spectral power distribution schematic diagram that colour temperature is the 8023K white light LEDs;
Figure 13 is the relative spectral power distribution schematic diagram that colour temperature is the 9107K white light LEDs.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only are not used in and limit the scope of the invention for the present invention is described.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiments of the present invention relate to a kind of white light that uses and add the method that the red-light LED combination obtains the high-color development LED white light, utilize Colored light mixing addition principle and color rendering properties of light source evaluation method, carry out analogue simulation by the yellow spectrum of the blue spectrum to blue chip, yellow fluorescent powder, the green spectrum of green emitting phosphor and the combination of red-light LED spectrum, be met under required LED combination white light colour temperature LED white light general colour rendering index Ra and special colour rendering index R
9all be greater than 90 white light LEDs and the combination of red-light LED, and reference color temperature, yellow fluorescent powder and the green emitting phosphor of having determined white light LEDs under required LED combination white light colour temperature mix the chromaticity coordinates scope that produces total fluorescence, and the peak wavelength scope of red-light LED, there is by selection white light LEDs and the red-light LED combination that special spectrum distributes, can obtain in 2700K～6500K reference color temperature general colour rendering index Ra and special colour rendering index R
9all be greater than 90 high light efficiency high-color development LED white light.The light fixture that utilizes the present invention to make can be suitable as special lighting and the general room illumination that high colour developing requires.
The red-light LED that the white light LEDs that the embodiment of the present invention is 1W series connection by 2 power, 1 power are 1W and control circuit separately form.The white light LEDs independent loop provides given drive current by the white light control circuit, and the red-light LED independent loop provides given drive current by the ruddiness control circuit, and control circuit and white light LEDs independent loop and red-light LED independent loop connection diagram are as shown in Figure 1.
The white light of white light LEDs excites yellow fluorescent powder and green emitting phosphor to produce by blue chip, and wherein, the peak wavelength of blue chip is 456.2nm, and its relative spectral power distribution as shown in Figure 2; The peak wavelength of yellow fluorescent powder is 580nm, and its relative spectral power distribution as shown in Figure 3; The peak wavelength of green emitting phosphor is 528nm, and its relative spectral power distribution as shown in Figure 4; The peak wavelength of red-light LED under drive current 350mA is 629.2nm, and its relative spectral power distribution as shown in Figure 5.
Relative spectral power distribution according to blue chip, yellow fluorescent powder, green emitting phosphor and red-light LED, determine gold-tinted that the blue chip under required LED combination white light colour temperature excites the remaining blue light of yellow-green fluorescence powder, yellow fluorescent powder to be excited, green glow that green emitting phosphor is excited and the logical percentage of light of ruddiness by analogue simulation, can determine that thus yellow fluorescent powder and green emitting phosphor mix the chromaticity coordinates scope that produces total fluorescence under required LED combination white light colour temperature, and the reference color temperature of white light LEDs.
LED combination white light for required 2700K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 4586K, its relative spectral power distribution as shown in Figure 6, wherein, it is u=0.1949 that yellow fluorescent material and green fluorescence powder mix the total iridescent coordinate of generation, v=0.3763; LED combination white light for required 3000K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 4848K, its relative spectral power distribution as shown in Figure 7, wherein, it is u=0.1916 that yellow and green fluorescence powder mixes the total iridescent coordinate of generation, v=0.3765; LED combination white light for required 3500K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 5365K, its relative spectral power distribution as shown in Figure 8, wherein, it is u=0.1857 that yellow and green fluorescence powder mixes the total iridescent coordinate of generation, v=0.3768; LED combination white light for required 4000K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 5931K, its relative spectral power distribution as shown in Figure 9, wherein, it is u=0.1807 that yellow and green fluorescence powder mixes the total iridescent coordinate of generation, v=0.3770; LED combination white light for required 4500K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 6522K, its relative spectral power distribution as shown in figure 10, wherein, shown in yellow and green fluorescence powder to mix the total iridescent coordinate of generation be u=0.1766, v=0.3772; LED combination white light for required 5000K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 7165K, its relative spectral power distribution as shown in figure 11, wherein, it is u=0.1680 that yellow and green fluorescence powder mixes the total iridescent coordinate of generation, v=0.3776; LED combination white light for required 5700K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 8023K, its relative spectral power distribution as shown in figure 12, wherein, it is u=0.1647 that yellow and green fluorescence powder mixes the total iridescent coordinate of generation, v=0.3778; For the LED combination white light of required 6500K colour temperature, in the present embodiment, the colour temperature of white light LEDs under drive current 350mA is 9107
K, as shown in figure 13, wherein, it is u=0.1613 that yellow and green fluorescence powder mixes the total iridescent coordinate of generation, v=0.3779 in its relative spectral power distribution.
According to the logical requirement of the gentle light of required LED combination white color, determine that the light of white light LEDs independent loop and red-light LED independent loop is logical; The several of white light LEDs and red-light LED determine the maximum light of rated power is logical according to single white light LEDs and red-light LED.In the present embodiment, the granule number of white light LEDs and red-light LED is to lead to under the 200lm condition according to required LED combination white light light, adopts above-mentioned specific implementation method and definite, thereby can further determine that institute's light requirement of single white light LEDs and red-light LED leads to; The relation of and drive current logical according to the light of white light LEDs and red-light LED, tentatively determine the drive current of white light LEDs and red-light LED.Because the relative spectral power distribution of LED changes with drive current, therefore, the drive current of white light LEDs and red-light LED also will be revised by analogue simulation, finally determines white light LEDs under required LED combination white light light is logical and the drive current of red-light LED.
According to above-mentioned specific implementation method, 2 total light of white light LEDs in the embodiment of the present invention under 2700K, 3000K, 3500K, 4000K, 4500K, 5000K, 5700K and 6500K colour temperature are logical and light red-light LED is logical as shown in table 1 below:
Table 1
Colour temperature (Tc), chromaticity coordinates (u, v), general colour rendering index (Ra) and the special colour rendering index (R of the LED combination white light of 2700K, the 3000K that the embodiment of the present invention obtains, 3500K, 4000K, 4500K, 5000K, 5700K, 6500K
9) as shown in table 2 below:
Table 2
As can be seen here, the white light that the present invention obtains is in the reference color temperature of 2700K～6500K, and general colour rendering index Ra reaches more than 90, and color rendering is very good; Special colour rendering index R particularly
9also all reach more than 90, show more outstanding.More than its light efficiency reaches 80lm/W, the present invention can also be by regulating and obtain the LED white light of not sharing the same light logical described white light control circuit and/or ruddiness control circuit.So it is significant LED from now on to be entered to the development of high colour developing lighting requirement occasion and general room illumination.
If add again red fluorescence powder in white light LEDs and adopt patented method of the present invention can realize equally high colour developing white light with the red-light LED combination.In the present invention, not use red fluorescence powder be the light efficiency that consider to improve white light LEDs to white light LEDs, adds red fluorescence powder in white light LEDs, just reduced the required luminous flux of red-light LED, therefore, do not have the change of substantive method.Therefore for adding red fluorescence powder in white light LEDs and realizing that with the red-light LED combination high colour developing white light is subject to this patent protection equally.
Adopt patented method of the present invention, for by a blue-light LED chip, red LED chip, the height colour developing white light LEDs that adds single different-colour of yellow fluorescent powder, green emitting phosphor and the manufacture of red fluorescence powder assembled package, also being subject to this patent protection.The white-light illuminating light fixture, white-light illuminating equipment and the white-light emitting body that adopt patented method of the present invention to make all are subject to this patent protection.
Claims (7)
1. one kind is used white light to add the method that the red-light LED combination obtains the high-color development LED white light, it is characterized in that, comprises the following steps:
(1) according to the relative spectral power distribution of blue chip, yellow fluorescent powder, green emitting phosphor and red-light LED, determine gold-tinted that the blue chip under required LED combination white light colour temperature excites the remaining blue light of yellow-green fluorescence powder, yellow fluorescent powder to be excited, green glow that green emitting phosphor is excited and the logical percentage of light of ruddiness by analogue simulation, thereby determine that described yellow fluorescent powder and green emitting phosphor mix the chromaticity coordinates scope that produces total fluorescence under described required LED combination white light colour temperature, and the reference color temperature of white light LEDs; The peak wavelength of described blue chip is 450～470nm; The peak wavelength of described yellow fluorescent powder is 560～600nm; The peak wavelength of described green emitting phosphor is 510～550nm; The peak wavelength of described red-light LED is 620～640nm;
(2) select corresponding white light LEDs under described required LED combination white light colour temperature to form the white light LEDs independent loop, and connect with the white light control circuit; Select red-light LED to form the red-light LED independent loop, and connect with the ruddiness control circuit; Wherein, the white light of described white light LEDs excites described yellow fluorescent powder and green emitting phosphor to produce by described blue chip;
(3), according to the logical requirement of the gentle light of described required LED combination white color, determine that the light of white light LEDs independent loop and red-light LED independent loop is logical;
(4) relation of and drive current logical according to the light of white light LEDs independent loop and red-light LED independent loop, determine the drive current of white light LEDs independent loop and red-light LED independent loop;
(5) by corresponding control circuit, provide definite drive current to white light LEDs independent loop and red-light LED independent loop respectively, thereby obtain the high-color rendering white-light of required colour temperature.
2. use white light according to claim 1 adds the method that the red-light LED combination obtains the high-color development LED white light, it is characterized in that, the peak wavelength of described blue chip is 455～465nm; The peak wavelength of described yellow fluorescent powder is 575～585nm; The peak wavelength of described green emitting phosphor is 525～535nm.
3. use white light according to claim 1 adds the method that the red-light LED combination obtains the high-color development LED white light, it is characterized in that, the peak wavelength of described red-light LED is 625～635nm.
4. use white light according to claim 1 adds the method that the red-light LED combination obtains the high-color development LED white light, it is characterized in that, the scope of described required LED combination white light colour temperature is 2700K～6500K; Wherein, for the LED combination white light of required 2700K～2870K colour temperature, the colour temperature of white light LEDs is 4300K～4630K, and it is u=0.2001 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3761, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 2871K～3220K colour temperature, the colour temperature of white light LEDs is 4631K～4980K, and it is u=0.1953 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3763, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 3221K～3710K colour temperature, the colour temperature of white light LEDs is 4981K～5480K, and it is u=0.1901 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3766, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 3711K～4260K colour temperature, the colour temperature of its white light LEDs is 5481K～6110K, and it is u=0.1855 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3768, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 4261K～4745K colour temperature, the colour temperature of its white light LEDs is 6111K～6670K, and it is u=0.1817 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3770, and the chromaticity coordinates scope is dC<0.01; For the LED combination white light of required 4746K～5310K colour temperature, the colour temperature of its white light LEDs is 6671K～7300K, and it is u=0.1788 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3771, and the chromaticity coordinates scope is dC<0.01; For the LED of required 5311K～6020K colour temperature combination white light, its white light LEDs colour temperature be 7301K～8120K, it is u=0.1718 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3774, the chromaticity coordinates scope is dC<0.01; For the LED of required 6021K～6500K colour temperature combination white light, its white light LEDs colour temperature be 8121K～9200K, it is u=0.1693 that yellow fluorescent material and green fluorescence powder mix the chromaticity coordinates that produces total fluorescence, v=0.3776, the chromaticity coordinates scope is dC<0.01.
5. use white light according to claim 1 adds the method that the red-light LED combination obtains the high-color development LED white light, it is characterized in that, described high-color rendering white-light carries out the logical adjusting of light by described white light control circuit and/or ruddiness control circuit.
6. use white light according to claim 1 adds the method that red-light LED combination obtains the high-color development LED white light, it is characterized in that, described white light LEDs independent loop carries out serial or parallel connection or string mixing by one or at least two white light LEDs and connects to form; Described red-light LED independent loop carries out serial or parallel connection or string mixing by one or at least two red-light LEDs and connects to form.
7. use white light according to claim 6 adds the method that the red-light LED combination obtains the high-color development LED white light, it is characterized in that, several logical according to the described required LED combination white light light size of described white light LEDs and red-light LED and single white light LEDs and red-light LED are determined the maximum light of rated power is logical.
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| CN101881391A (en) * | 2010-06-21 | 2010-11-10 | 张汝京 | Luminous device |
| WO2012031385A1 (en) * | 2010-09-07 | 2012-03-15 | 深圳市众明半导体照明有限公司 | Warm white light led chip with high brightness and high color rendering |
| CN102128425A (en) * | 2011-03-04 | 2011-07-20 | 缪仙荣 | Method for improving colour rendering index of LED light source |
| CN102278641A (en) * | 2011-08-25 | 2011-12-14 | 上海亚明灯泡厂有限公司 | White light-emitting diode (LED) lamp and method for generating high color rendering white light |
| BR112019006852A2 (en) * | 2016-10-07 | 2019-08-06 | Enchroma Inc | lighting system for simulating color-deficient vision conditions and demonstrating the effectiveness of gray compositing |
| CN108924390A (en) * | 2018-06-27 | 2018-11-30 | 朗昭创新控股（深圳）有限公司 | A kind of photographic device |
| CN108977200A (en) * | 2018-06-27 | 2018-12-11 | 朗昭创新控股（深圳）有限公司 | Containing fluorescent powder composition and preparation method thereof |
| CN112413456A (en) * | 2020-11-26 | 2021-02-26 | 欧普照明股份有限公司 | Light source module and lamp |
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| CN1929710A (en) * | 2005-09-05 | 2007-03-14 | 林文钦 | White light-emitting device capable of regulating color temperature |
| CN201225532Y (en) * | 2008-05-06 | 2009-04-22 | 深圳市九洲光电子有限公司 | Power type white light LED |
| CN201232879Y (en) * | 2008-07-22 | 2009-05-06 | 深圳市同洲电子股份有限公司 | High color rendering property LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1929710A (en) * | 2005-09-05 | 2007-03-14 | 林文钦 | White light-emitting device capable of regulating color temperature |
| CN201225532Y (en) * | 2008-05-06 | 2009-04-22 | 深圳市九洲光电子有限公司 | Power type white light LED |
| CN201232879Y (en) * | 2008-07-22 | 2009-05-06 | 深圳市同洲电子股份有限公司 | High color rendering property LED lamp |
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