CN108916679A - The optimization method of quasi- natural light LED light source - Google Patents
The optimization method of quasi- natural light LED light source Download PDFInfo
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Abstract
The present invention is suitable for lighting technical field, provides a kind of optimization method of quasi- natural light LED light source, including：The first illuminator is chosen for issuing white light；Optimization white light is the first near-nature forest light；Wave band to be optimized is determined according to the spectrum of the first near-nature forest light and natural light spectrum；According to the second illuminator of waveband selection to be optimized；Determine the initial luminous flux ratio of the first illuminator and the second illuminator；By adjusting the spatial distribution optimum organization spectrum of the first illuminator and the second illuminator, quasi- natural light and identical or both the difference of the driving current of the first illuminator and the second illuminator are obtained within a predetermined range.The relative spectral power for the quasi- natural light that this method obtains realizes low blue light high color temperature close to natural light, is conducive to protect eyesight, reduces non-health illumination, while guaranteeing preferable visual effect；It promotes the relative spectral power of feux rouges and then promotes healthcare function；Unified electric current driving, so that light source applicability is good, realizes the major technological breakthrough of quasi- natural lighting.
Description
Technical Field
The invention relates to the technical field of LEDs, in particular to an optimization method of a quasi-natural light LED light source.
Background
Light is one of the necessary conditions for human survival, the artificial light solves the illumination problem at night or in dark environment, but greatly changes the circadian rhythm formed by people to natural light for a long time, and the harm brought to people by the illumination of the common artificial light is not negligible. This harm is mainly due to spectral imperfections of artificial light relative to natural light, as well as higher blue light components and shorter wavelength violet and ultraviolet light components, which create an unnatural, uncomfortable feeling for the person.
Among visible light, ultraviolet, violet and blue light are the most harmful to human eyes. The blue light damages the eyes in the back half of the eyeball, which leads to the pathological changes of the macular area. Since blue light accelerates oxidative stress of photoreceptor cells in the macula and retinal pigment epithelium in the retina, which are both non-regenerative, it affects vision and is irreversible. The damage of blue light to eyes, especially to vision of immature students and children is obvious, so that the color of the children is weak, the color discrimination capability of the children is reduced, and the myopia rate of the juveniles is increased.
The influence of light on human health, emotion and the like is great. For example, light fixtures in an office are often high color temperature light sources to improve visibility and working mood of workers. The blue light component contained in the lamp contains high blue light component, and the phenomena of dizziness, headache, poor spirit and the like can occur when the lamp is in the illumination environment of an artificial light source for a long time. And under the natural light environment, people feel comfortable and relaxed.
Along with the development of lighting technology, the overall performance requirements of people on light quality, comfort level and the like are continuously improved, and various novel light sources and technologies are continuously emerged, such as an LED light source for simulating natural light spectrum, a dynamic intelligent lighting technology and the like. Needless to say, the most desirable lighting light is natural light, which has always been the vision of the lighting industry.
The spectrum of a white light illumination product in the prior LED technology is still greatly different from natural light, and the difference mainly comprises the difference of wavelength ranges and the difference of relative spectral power of all wave bands. Fig. 10 shows a spectrum of a white light source using a blue light chip combined with a phosphor, and the wavelength range and the light emission intensity of the chip and the wavelength range of the phosphor are limited to a certain extent, so that the spectrum of the combined structure is still greatly different from that of natural light, especially, the blue light ratio is too high, and the color temperature, the color tolerance, and the like are greatly different from that of natural light. Fig. 11 illustrates a spectrum of a white light source using a combination of chips with various wavelengths, such as a three primary color combination structure of a red chip, a green chip and a blue chip, wherein the white light has a distinct peak of three central wavelengths of red, green and blue, and other wavelengths are relatively low and far from a natural spectrum; the structure is difficult to uniformly mix light, and the size is large; and the driving mode of a plurality of chips is complicated, a control chip is needed, the circuit is complicated, the application is inconvenient, and the applicability is poor.
Therefore, the light sources for obtaining quasi-natural light in the prior art have the defect of great difference with natural light. Nowadays, the proportion of children with eyesight defects and sub-healthy people is getting larger and larger, and the social demands of providing healthy quasi-natural light illumination, improving the eyesight of children and guaranteeing the health of people are urgent.
Disclosure of Invention
The invention aims to provide an optimization method of a quasi-natural light LED light source, which aims to obtain the quasi-natural light source through the method, solve the technical problem that the difference between light emitted by a traditional white light source and natural light is large, reduce the use of unhealthy lighting sources, protect eyesight, improve the comfort of lighting and promote the health of the people.
The invention is realized in this way, the optical optimization method of LED light source, including the following steps:
selecting a first light emitter, wherein the first light emitter is used for emitting white light;
optimizing a spectral distribution of the first light emitter to optimize the white light to a first near-natural light;
determining a waveband to be optimized of the first near natural light according to the spectral distribution of the first near natural light and the spectral distribution of the natural light;
selecting a second luminophor according to the to-be-optimized waveband;
determining an initial luminous flux ratio of the first illuminant and the second illuminant;
optimizing the combined spectrum of the first luminophor and the second luminophor by adjusting the spectral distribution of the first luminophor and the second luminophor to obtain quasi-natural light, wherein the driving currents of the first luminophor and the second luminophor are the same or the difference is in a preset range;
wherein the adjustment of the spectral distribution of the first and second light emitters comprises at least an adjustment of the drive current.
The LED light source optimization method has the beneficial effects that:
the first illuminant emits first near natural light, the second illuminant is added to compensate the spectrum missing part in the first near natural light, the reasonable ranges of relative spectral power and optical parameters of each waveband of the spectrum are set, and the spectral distribution of the first illuminant and the second illuminant is adjusted in the optimization process, so that the shape of the combined spectrum and the corresponding optical parameters meet the preset requirements, and the quasi-natural light is obtained. The quasi-natural light obtained by the method can be closer to the characteristics of natural light, the problems of incomplete spectrum, missing partial wave bands and substandard optical parameters of the traditional light source are solved, the eyesight and the body health are protected, and the method is a technical breakthrough with great significance in the technical field of LED illumination. And, realize that different luminous bodies drive through the same electric current is unified, greatly simplified the circuit structure of light source structure and terminal application product, promoted the suitability of light source.
Drawings
Fig. 1 is a flowchart of an optimization method of a quasi-natural light LED light source according to an embodiment of the present invention;
FIG. 2 is a schematic spectrum diagram of a first light emitter provided by an embodiment of the present invention;
FIG. 3 is a schematic illustration of a natural light spectrum;
fig. 4 is a flowchart of step S106 of the method for optimizing a quasi-natural light LED light source according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a spectrum of quasi-natural light provided by an embodiment of the present invention;
FIG. 6 is a graph comparing spectra of quasi-natural light and natural light provided by embodiments of the present invention;
FIG. 7 is a report of a spectral test of the quasi-natural light shown in FIG. 5;
FIG. 8 is a schematic diagram of a spectrum of white light with a blue light chip of 452.5-455nm according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a quasi-natural light LED light source provided by an embodiment of the present invention;
FIG. 10 is a first spectral plot of a prior art white light source;
FIG. 11 is a second spectral plot of a prior art white light source;
fig. 12 is a spectral diagram of a prior art near natural light source.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Explanation of technical terms:
1. relative spectral power:
the spectrum emitted by a light source is often not a single wavelength, but consists of a mixture of many different wavelengths of radiation. The spectral radiation of the light source in wavelength order and the intensity distribution of the individual wavelengths is referred to as the spectral power distribution of the light source.
The parameters for characterizing the magnitude of the spectral power are divided into absolute spectral power and relative spectral power. And then the absolute spectral power distribution curve: refers to a curve made of absolute values of the energy of various wavelengths of the spectral radiation;
relative spectral power distribution curve: the spectral power distribution curve is a spectral power distribution curve in which energies of various wavelengths of a light source radiation spectrum are compared with each other, and the radiation power is changed only within a predetermined range after normalization processing. The relative spectral power with the maximum radiation power is 1, and the relative spectral power of other wavelengths is less than 1.
2. Color ratio:
any white light can be obtained by mixing the three primary colors of red, green and blue in corresponding proportion, and chromaticity coordinates R, G and B are introduced in order to represent the relative proportion of the R, G, B primary colors in the total white light, wherein R is R/(R + G + B), G is G/(R + G + B), B is B/(R + G + B), R + G + B is 1, and R, G and B are respectively a red color ratio, a green color ratio and a blue color ratio.
In order to explain the technical solution of the present invention, the following detailed description is made with reference to the specific drawings and examples.
Referring to fig. 1, an embodiment of the invention provides a method for optimizing an LED light source, including the following steps:
step S101, selecting a first light emitter, wherein the first light emitter is used for emitting white light;
step S102, optimizing the spectral distribution of the first light emitter, and optimizing the white light into first near-natural light;
step S103, determining a to-be-optimized waveband of the first near natural light according to the spectral distribution of the first near natural light and the spectral distribution of the natural light;
step S104, selecting a second luminophor according to the to-be-optimized wave band;
step S105, determining an initial luminous flux ratio of a first luminous body and a second luminous body;
step S106, optimizing the combined spectrum of the first luminous body and the second luminous body by adjusting the spectral distribution of the first luminous body and the second luminous body to obtain quasi-natural light, wherein the driving currents of the first luminous body and the second luminous body are the same or the difference is in a preset range;
wherein the adjustment of the spectral distribution of the first and second light emitters comprises at least an adjustment of the drive current.
The LED light source optimization method has the beneficial effects that: the first illuminant emits first near natural light, the second illuminant is added to compensate the spectrum missing part in the first near natural light, the reasonable ranges of relative spectral power and optical parameters of each waveband of the spectrum are set, and the spectral distribution of the first illuminant and the second illuminant is adjusted in the optimization process, so that the shape of the combined spectrum and the corresponding optical parameters meet the preset requirements, and the quasi-natural light is obtained. The quasi-natural light obtained by the method can be closer to the characteristics of natural light, the problems of incomplete spectrum, missing partial wave bands and substandard optical parameters of the traditional light source are solved, the eyesight and the body health are protected, and the method is a technical breakthrough with great significance in the technical field of LED illumination. And, realize that different luminous bodies drive through the same electric current is unified, greatly simplified the circuit structure of light source structure and terminal application product, promoted the suitability of light source.
The optimization method is explained in detail below.
In steps S101 and S102, a white light emitter is selected as a first light emitter, and the white light emitter is used as a main light emitter, wherein the main light emitter has a larger wavelength range at least including the wavelength range of 400-640 nm.
The white light emitting body in this embodiment adopts a structure in which a blue light chip is matched with an optical conversion film, but the invention is not limited thereto, and white light meeting corresponding requirements can be obtained through other structures.
In the present invention, the optical conversion film may be a fluorescent film or a phosphor film. The present embodiment is preferably a fluorescent film, and the following description will be made by taking a fluorescent film as an example.
After the step S102, the white light is optimized to be the first near-natural light, so that the white light is as close to the natural light as possible, and the relative spectral power of the white light is improved as much as possible during the optimization process, so that the subsequent type selection of the second light emitter is simpler, and the optimization of the combined spectrum of the two light emitters is facilitated.
Specifically, referring to fig. 2, which illustrates a spectral curve of the first near natural light, the color temperature range of the optimized first near natural light at least includes 2700-. The method specifically comprises the following steps: when the color temperature of the first near natural light is 2700K-3000K, the relative spectral power of 480-5 nm waveband is more than 0.30; the relative spectral power of the 500-640nm waveband is more than 0.70; when the color temperature of the first near natural light is 4000K-4200K, the relative spectral power of the 480-500nm waveband is greater than 0.45; the relative spectral power of the 500-640nm waveband is more than 0.65; when the color temperature of the first near natural light is 5500K-6000K, the relative spectral power of the 480-500nm waveband is more than 0.4; the relative spectral power of the 500-640nm wave band is more than 0.60.
In visible light, the correspondence between wavelength and color is as follows: red light (622-700 nm), orange light (597-622 nm), yellow light (577-597 nm), green light (492-577 nm), cyan light (475-492 nm), blue light (435-475 nm) and purple light (380-435 nm). The 480-nm band mainly comprises cyan light, a small part of blue light and a small part of green light, and the 500-640nm band mainly comprises green light, yellow light and red light.
Referring to the natural light spectrum shown in fig. 3 and the first near natural light spectrum shown in fig. 2, it can be seen that the wavelength ranges between 400 and 640nm are relatively close to each other, but in the red light portion larger than 640nm, the first near natural light has obvious loss, which is represented by a sharp drop of the relative spectral power. Therefore, it can be determined that the red light needs to be supplemented. Further, it relates to selecting a red-emitting second light emitter for combining with the first light emitter to obtain an illumination light closer to natural light; on the other hand, by supplementing red light, blue light can be reduced, and this conclusion can be confirmed by the previous basic research, the contents of which will be described later in detail.
Therefore, in steps S103 and S104, the wavelength band to be optimized of the first near natural light is determined to be 640-700 nm; selecting a second light emitter according to the requirement, wherein the second light emitter can emit at least 640-700nm red light. Specifically, the wavelength range may be a smaller range within the range, for example, the wavelength range is 680-700nm, corresponding to a center wavelength of 690 + -5 nm. The center wavelength is typically the center of the wavelength range and allows a tunable interval around ± 2 nm. The central wavelength may also be 660nm, 670nm, 680nm, etc. for different intervals, and the embodiment is not limited to one. Further, according to the spectrum curve of the first near natural light and through a large number of combined spectrum debugging experiments, the central wavelength of the second light-emitting body is determined to be 690 +/-5 nm, so that the relative spectral power of the red light with the wavelength of 640-700nm can be close to the spectrum of the natural light as much as possible after the second light-emitting body is combined with the spectrum of the first near natural light.
In step S105, after the first illuminant and the second illuminant are determined, a reasonable luminous flux ratio, i.e. a ratio of luminous flux of the first illuminant and light radiation amount of the second illuminant, which is referred to as an "initial luminous flux ratio" herein, can be selected according to spectrums of the two illuminants, and it can be preliminarily determined that the initial luminous flux ratio is feasible within a range of 2-10:1 according to the wavelength ranges and the spectrum characteristics of the first near-natural light and the red light. Further, it can be further determined through experiments that the initial luminous flux ratio is in the range of 2-5:1, and then the process of optimizing the combined spectrum is performed by lighting a corresponding number of the first luminous bodies and a corresponding number of the second luminous bodies according to the preset initial luminous flux ratio.
The optimization process of step S106 is crucial, the combined spectrum of the first and second light emitters is optimized by adjusting the spectral distributions of the first and second light emitters, in particular, at least by adjusting the driving currents, and quasi-natural light is obtained in case that the driving currents of the first and second light emitters are the same or the difference therebetween is within a predetermined range. That is, not only quasi-natural light is obtained, but also the driving current is consistent or slightly different within an allowable small range, so that in actual operation, when the same current is used for driving, obvious changes of the spectrum and the optical parameters are not caused.
In the debugging process, when the relative spectral power (shape) and optical parameters of the combined spectrum meet the requirements and the driving currents are consistent, quasi-natural light is confirmed to be obtained. It will be appreciated that the "requirement" is a predetermined parameter range, which may be reasonably set by reference to a parameter range which is recognized by most of the public in the art.
With particular reference to fig. 4, this step S106 comprises the following sub-steps:
s1: adjusting the driving currents of the first light emitter and the second light emitter, monitoring the combined spectrum in real time, and performing step S2 when the relative spectral power of the combined spectrum reaches a predetermined range, otherwise, repeating step S1;
s2: detecting the optical parameters of the combined spectrum, and performing step S3 when the optical parameters reach a preset range, otherwise, returning to step S1;
s3: adjusting the driving current of the first light emitter and/or the second light emitter to enable the two driving currents to be consistent;
s4: adjusting the luminous flux of the first light emitter and/or the light radiation quantity of the second light emitter according to the change of the relative spectral power of the combined spectrum, monitoring the combined spectrum in real time, and performing step S5 when the relative spectral power of the combined spectrum meets a preset range, or performing step S1;
s5: detecting the optical parameters of the combined spectrum, confirming that quasi-natural light is obtained when the optical parameters reach a preset range, and performing step S6, otherwise performing step S1;
s6: recording the actual driving currents of the first and second luminous bodies, the actual proportions of the luminous flux of the first luminous body and the light radiation quantity of the second luminous body, and the optical parameters of quasi-natural light.
The above steps disclose a specific implementation process of step S106, first, the first light emitter and the second light emitter in corresponding numbers are lit according to the initial luminous flux ratio, the luminous flux of the first light emitter and the light radiation amount of the second light emitter are respectively adjusted by adjusting the driving current, at this time, the combined spectrum changes, after a plurality of times of debugging, the shape of the combined spectrum (i.e., the relative spectral power of each band) and the natural light approach to the allowable range, and at this time, the spectrum is confirmed to meet the requirements.
On the basis, the optical parameters are checked, if the optical parameters meet the preset range, quasi-natural light is determined to be obtained, and if the optical parameters do not meet the preset range, the driving current is adjusted repeatedly, so that the optical parameters meet the requirements.
After both the spectral and optical parameters meet the requirements, the driving currents are usually inconsistent, and subsequent adjustments are required to achieve uniform driving, which is lengthy and complicated. Step S3 is first performed: adjusting the driving current of the first light emitter and/or the second light emitter to enable the two driving currents to be consistent; when the currents are uniform, the combined spectrum must change. Then, step S4 is performed: and further adjusting the luminous flux of the first luminous body and the light radiation quantity of the second luminous body according to the change of the relative spectral power of the combined spectrum, monitoring the combined spectrum in real time, wherein the adjusted luminous flux or light radiation quantity is the luminous flux or light radiation quantity, detecting the optical parameters of the combined spectrum when the relative spectral power of the combined spectrum conforms to a preset range, and confirming that quasi-natural light is obtained when the optical parameters reach the preset range. This is an ideal situation.
However, after adjusting the luminous flux, it is difficult to conform the relative spectral power to a predetermined range, and the optical parameters are also liable to fluctuate. Therefore, steps S1 to S5 are repeated to readjust the driving current (in this case, fine tuning is required) so that the relative spectral power and the optical parameters meet the predetermined range. Since the step of adjusting the driving current to be consistent is performed every time in the process of repeating the steps S1-S5, the current will gradually tend to be consistent in a plurality of adjustments, and the adjustment range for the luminous flux and the current will gradually decrease, and finally quasi-natural light meeting the requirements under the condition that the driving current is consistent will be obtained.
Further, in the optimization process of the combined spectrum, there may be the following cases: after the driving current is adjusted for many times, the spectrum or optical parameter still cannot meet the requirement, and at this time, step S0 is performed:
step S0: adjusting the formula and/or concentration and/or thickness of the optical conversion film, and then performing step S1;
or,
step S0: adjusting the center wavelength of the second light emitter, and then performing step S1;
or,
step S0: a third emitter having a center wavelength different from the center wavelength of the second emitter is added and then step S1 is performed.
According to the basic research (described later), the relationship between the fluorescent film and the spectrum optimization and the relationship between the red light and the spectrum optimization can be obtained, and under the guidance of the corresponding theory, the optimization scheme can be adjusted in a proper way.
Specifically, in the first embodiment, the step of adjusting the formulation and/or concentration and/or thickness of the optical switching film comprises: adjusting the relative spectral power and/or color rendering index of each waveband by adjusting the formula of the optical conversion film; the formula refers to the components and the proportion of the fluorescent powder material in the fluorescent film. Adjusting the color rendering index and/or the color temperature by adjusting the concentration of the optical conversion film; the concentration refers to the content of the fluorescent powder in the fluorescent film under the condition of determined formula. The color temperature is adjusted by adjusting the thickness of the optical conversion film.
In a second embodiment, the center wavelength of the second emitter is adjusted, or a third emitter having a center wavelength different from the center wavelength of the second emitter is added. To be optimized after being combined with the first light emitter.
Both of the above-mentioned situations may occur in a practical optimization process, i.e. the optimization process involves the adjustment of the phosphor film, the adjustment of the red light emitters and the adjustment of the drive current and the luminous flux repeatedly a number of times, before the final result is obtained.
Finally, after the commissioning is finished, the corresponding parameters are recorded, and at least the actual ratio of the luminous flux of the corresponding first luminous body to the light radiation amount of the second luminous body is recorded, so as to accurately determine the ratio. The drive current, as well as the optical parameters, are also recorded. This data is used to provide the necessary information for the manufacturing of the light source.
The optical parameters comprise at least color temperature, color coordinates, color tolerance, color rendering index Ra, color rendering index R9, color rendering index R12, and blue light color ratio.
In the present embodiment, the predetermined range of the color tolerance is less than 5, the predetermined range of the color rendering index RA is greater than 90, the predetermined ranges of the color rendering index R9 and the color rendering index R12 are greater than 80, and the predetermined range of the blue light color ratio is less than 5.7%, and the blue light color ratio of the existing near natural light source is still high, as shown in fig. 12. According to the results of the study published in academic journals such as nature on international top level, the cells in human retina sensing blue color are only 5.7%, so this example reduces the blue color ratio to below 5.7%. Wherein the predetermined range of the color rendering index R9 may be increased to 90 or more and the predetermined range of the color rendering index R12 is greater than 80.
Further preferably, the corresponding quasi-natural light spectrogram, chromaticity diagram, other electrical parameters, light effect parameters, red, green and blue ratio parameters and other information can be stored. Of course, various optical parameters of the first and second emitters are preserved when selected, such as wavelength range, center wavelength, model, specification, current rating, light efficiency, etc.
With further reference to fig. 5 and 7, by optimizing the first light emitter and optimizing the combined spectrum, in case the spectral shape meets the requirements, the color rendering index Ra is increased to above 97, the color rendering index R9 is increased to above 95, the color rendering index R12 is increased to above 80, and the blue light color ratio can be reduced to below 5.5%.
As a further optimization scheme, the blue light with the wavelength of 440nm in the blue light has the greatest damage to vision, and the relative spectral power of the blue light with the wavelength of 440nm is also used as the optical parameter to be detected in the embodiment. It was further determined that the relative spectral power of 440nm blue light needs to be below 0.65 for blue light color ratios below 5.7%. This is difficult to achieve with existing eye-protection electronic devices. Although the blue light color ratio of the existing eye-protecting electronic product is lower, the inhibition of 440nm blue light which has the greatest damage to human eyes is not obvious, and the eye-protecting function is very little. Other waveband components in the blue light are necessary for visual development, so that the effect of protecting eyes is not obvious when the blue light is greatly inhibited, and adverse effects such as poor color and the like caused by excessive deficiency of the blue light component can be caused to the visual development of people such as children and infants. This embodiment is on reducing blue light color ratio to below 5.7% the basis, and the intensity of the blue light of 440nm is restrained to the key, can be real to play the effect of protecting eyesight, remains partial blue light moreover for white light is more close to the natural light.
Further, through the optimization process, the actual ratio of the luminous flux of the first luminous body to the light radiation quantity of the second luminous body is determined to be 2-3: 1. When the color temperatures of quasi-natural light are different, the actual ratio is slightly different, and the drive current is also slightly different. For each color temperature, corresponding data is recorded for providing the necessary data for the manufacture of the light source. In particular, during manufacturing, several color temperature products can be selected according to actual application requirements. For example, lamps used in offices are generally selected as products having a higher color temperature, lamps used in homes are generally selected as products having a lower color temperature.
The basic research involved in the embodiments of the present invention is as follows:
basic research is as follows: and (5) research of quasi-natural light spectrum.
Natural light in nature comes from solar luminescence, and the natural light is different in four seasons or even different periods of a day, and mainly shows the difference of spectrum and color temperature. The sunlight in early spring morning makes people feel comfortable, and in the embodiment of the invention, the sunlight spectrum in early spring morning can be selected as a reference, and the relative spectral power and the optical parameters of the natural light are set. Of course, this is a preferred embodiment, and natural light at other times can be used as a measure to set the corresponding parameter requirements of quasi-natural light. The optimization method provided by the embodiment of the invention is suitable for natural light at various times, and only needs to slightly adjust certain parameters.
Basic research two: spectral shape versus phosphor film formulation. Research shows that the fluorescent film formula has a large relation with the corresponding spectrum shape; changing the proportion of one powder in the formula can directly change the relative spectral power of the corresponding wavelength band, and the larger the proportion is, the larger the relative spectral power of the corresponding wavelength is, and the color rendering index can be changed at the same time. Based on the above, when the spectrum shape and the color rendering index are not satisfactory, the proportion of certain powder can be increased or decreased according to the specific wave band, or the color coordinate parameter of certain powder can be changed.
Basic research three: spectral shape versus phosphor film concentration. Research shows that under the condition of unchanged formula, the higher the concentration of the fluorescent powder, the higher the relative spectral power of 490-700nm is, until the relative spectral power of blue light is exceeded, the color temperature is reduced along with the reduction of the relative spectral power of the blue light, the light color is changed, and the color rendering index is changed along with the change of the color temperature. Based on this, the color rendering index and the color temperature can be changed by changing the density. However, when the concentration is adjusted to a certain state and the color temperature is not in accordance with the requirement, the formulation ratio of each powder in the fluorescent film is also changed to ensure that the light color of different color temperatures conforms to the international standard (i.e. the color coordinate of the standard color temperature).
And fourthly, basic research: spectral shape and color temperature versus fluorescent film thickness. Studies have shown that the greater the thickness of the phosphor film, the lower the color temperature, with the same formulation and concentration. Based on this, when the colour temperature does not satisfy the requirement, can adjust the colour temperature through changing thickness, and it is little to other parameters influence.
Basic research five: the drive current is related to the spectral shape change. Research shows that the relation between the driving current and the change of the spectral shape is as follows: (1) increasing the drive current of either chip (blue or red) will change its corresponding spectral power; (2) the optimal spectrum optimization result can be obtained by adjusting the driving currents of the two chips; (3) increasing the drive current of one of the chips to increase its luminous flux suppresses the relative spectrum of the other chip. Based on this, the combined spectrum can be adjusted by adjusting the driving current, and the blue light can be suppressed, that is, the blue light can be suppressed by adding a red light chip.
And sixthly, basic research: red chip specification versus light radiation amount. Research shows that the relationship between the red chip specification and the light radiation quantity is as follows: under the condition of constant driving current, generally, as the chip specification increases, the light radiation quantity of the chip increases. Based on the above, the specification of the red light chip with the optimal selective valence ratio can be determined according to the final actual luminous flux ratio. The optimal cost performance means that the specification is as small as possible, the welding requirements can be met, the lighting effect is as high as possible, the reliability is good, and meanwhile, the price is considered.
The invention also carries out a seventh basic research: the relationship between the luminous flux of the white light luminous body and the quasi-natural light spectrum optimization is researched on the basis of eight: the light radiation quantity of the red light chip is in optimized relation with the quasi-natural light spectrum. The seventh basic research is carried out to find the specification of the blue light chip with the best (cost performance), the formula of the fluorescent film, the concentration and the thickness; searching a blue light chip and a fluorescent film which enable the light emitted by the first light emitter to be close to the natural spectrum as much as possible; the basic research eight aims to find the specification of the red chip with the best (cost performance), find the best value of the light radiation quantity (specification) of the red chip for inhibiting the blue light relative spectrum, and find the red chip for enabling the combined spectrum to be close to the natural spectrum as far as possible.
Through the theoretical guidance and a large amount of experimental debugging, the specifications and parameters of the first luminous body and the second luminous body are determined. The method comprises the following specific steps:
the LED light source is formed by combining a second light-emitting body with a wave band and a central wavelength with a first light-emitting body, wherein the second light-emitting body comprises a red light chip, the wavelength range of the red light chip is 640-700nm, the central wavelength is preferably 690 +/-5 nm, the first light-emitting body comprises a blue light chip with the wavelength of 450-480nm and an optical conversion film, and further preferably, the optical conversion film is a fluorescent film. The ratio of the luminous flux of the first luminous body to the light radiation quantity of the second luminous body is 2-3:1, and specific luminous flux ratio values corresponding to different color temperatures can be determined in the debugging process. At the manufacturing end, according to the luminous flux ratio, a corresponding number of red light chips and blue light chips are selected.
The fluorescent film comprises silica gel and fluorescent powder, wherein the fluorescent powder is a main factor influencing the luminous property of the first luminous body, and the fluorescent powder comprises: red, green and yellow-green powders;
the color coordinate of the red powder is X: 0.660 to 0.716, Y: 0.340-0.286;
the color coordinate of the green powder is X: 0.064-0.081, Y: 0.488-0.507;
the color coordinate of the yellow-green powder is X: 0.367 to 0.424, Y: 0.571 to 0.545;
the weight ratio of red powder, green powder and yellow-green powder is as follows:
red powder: green powder: yellow-green powder (0.010-0.035): (0.018-0.068): 0.071-0.253);
the concentration of the fluorescent film is 17-43%.
The thickness of the fluorescent film is preferably 0.2-0.4 mm. The particle size of the red, green and yellow-green powders is less than 15 μm, preferably 13 ± 2 μm.
Further, the red phosphor is preferably a nitride red phosphor, and more preferably, the nitride red phosphor includes CaSrAlSiN3(1113 structure). And the green phosphor is preferably oxynitride green phosphor, and more preferably, the oxynitride green phosphor comprises BaSi2O2N2(1222 structure). And the yellow-green powder preferably comprises Y3Al5Ga5O12 (i.e., gallium-doped yttrium aluminum garnet). The CaSrAlSiN3 nitride red fluorescent powder, the BaSi2O2N2 nitrogen oxide green fluorescent powder and the Y3Al5Ga5O12 yellow-green fluorescent powder can reach color coordinates required by the respective fluorescent powder, have better luminous intensity and stability, and are very suitable for being used in the fluorescent powder of the embodiment of the invention. The above-mentioned kinds of phosphors are commercially available.
Example 1 as a fluorescent film:
a fluorescent film comprises AB silica gel, CaSrAlSiN3 red phosphor (color coordinate, X: 0.660-0.716, Y: 0.286-0.340), BaSi2O2N2 green phosphor (color coordinate, X: 0.064-0.081, Y: 0.488-0.507) and Y3Al5Ga5O12 yellow-green phosphor (color coordinate, X: 0.367-0.424, Y: 0.545-0.571); wherein, the weight ratio of CaSrAlSiN3 red phosphor, BaSi2O2N2 green phosphor and Y3Al5Ga5O12 yellow-green phosphor is (0.020-0.035): (0.018-0.030): (0.140-0.253), and the mass percentage of the three fluorescent powders in the fluorescent film is 33-43%.
The fluorescent film can obtain near-natural white light with the color temperature of 2700K-3000K through blue light excitation: in the spectrum, the relative spectrum of 480-500nm band is greater than 0.30, and the relative spectrum of 500-640nm band is greater than 0.70.
Example 2 as a fluorescent film:
a fluorescent film comprises AB silica gel, CaSrAlSiN3 red phosphor (color coordinate, X: 0.660-0.716, Y: 0.286-0.340), BaSi2O2N2 green phosphor (color coordinate, X: 0.064-0.081, Y: 0.488-0.507) and Y3Al5Ga5O12 yellow-green phosphor (color coordinate, X: 0.367-0.424, Y: 0.545-0.571); wherein, the weight ratio of CaSrAlSiN3 red phosphor, BaSi2O2N2 green phosphor and Y3Al5Ga5O12 yellow-green phosphor is (0.010-0.022): (0.020-0.040): (0.080-0.140), and the mass percentage of the three kinds of fluorescent powder in the fluorescent film is 25-35%.
The fluorescent film can obtain near-natural white light with the color temperature of 4000K-4200K by being excited by blue light: in the spectrum, the relative spectrum of 480-500nm band is greater than 0.45, and the relative spectrum of 500-640nm band is greater than 0.65.
Example 3 as a fluorescent film:
a fluorescent film comprises AB silica gel, CaSrAlSiN3 red phosphor (color coordinate, X: 0.660-0.716, Y: 0.286-0.340), BaSi2O2N2 green phosphor (color coordinate, X: 0.064-0.081, Y: 0.488-0.507) and Y3Al5Ga5O12 yellow-green phosphor (color coordinate, X: 0.367-0.424, Y: 0.545-0.571); wherein, the weight ratio of CaSrAlSiN3 red phosphor, BaSi2O2N2 green phosphor and Y3Al5Ga5O12 yellow-green phosphor is (0.010-0.020): (0.030-0.068): (0.071-0.130), the mass percentage of the three kinds of fluorescent powder in the fluorescent film is 17-27%.
The fluorescent film can obtain white light of near natural light with color temperature of 5500K-6000K by blue light excitation: in the spectrum, the relative spectrum of 480-and 500-nm bands is greater than 0.40, and the relative spectrum of 500-and 640-nm bands is greater than 0.60.
As a further improvement of this embodiment, this embodiment adopts a blue light chip with 457.5-480nm or at least 457.5-460nm, and cooperates with the above-mentioned fluorescent film, besides obtaining the first near natural light, it also aims at improving the proportion of cyan light. In many studies of near-natural light LED technology, the blue light ratio is difficult to increase. The embodiment of the invention breaks through the tradition that the white light source is manufactured by adopting 450-455nm blue light chips in the traditional technology, selects 457.5-480nm or 457.5-460nm blue light chips, and combines the fluorescent film to obtain the first near-natural light, wherein the relative spectral power of the blue light is obviously improved.
Referring to fig. 2 and 8, fig. 2 shows the spectrum of white light in this embodiment, when the blue chip of 457.5nm to 460nm is used, the relative spectral power of cyan light is already above 0.5, and when the blue chip of 452.5 nm to 455nm is used in fig. 8, the relative spectral power of cyan light is only between 0.35 and 0.38.
Further, with the fluorescent film and the blue light chip, the first near natural light can be obtained, which has the following parameters in conjunction with fig. 2:
when the color temperature of the first near natural light is 2700K-3000K, the relative spectral power of the 480-5 nm waveband is more than 0.30; the relative spectral power of the 500-640nm waveband is more than 0.70; when the color temperature of the first near natural light is 4000K-4200K, the relative spectral power of the 480-500nm waveband is greater than 0.45; the relative spectral power of the 500-640nm waveband is more than 0.65; when the color temperature of the first near natural light is 5500K-6000K, the relative spectral power of the 480-500nm waveband is more than 0.4; the relative spectral power of the 500-640nm wave band is more than 0.60.
After the first near-natural light and red light chip are combined, the obtained quasi-natural light color temperature is 2500-; the relative spectral power of the orange light is greater than 0.55; the relative spectral power of the yellow light is greater than 0.50; the relative spectral power of the green light is greater than 0.35; the relative spectral power of the cyan light is greater than 0.30; the relative spectral power of blue light in the quasi-natural light is less than 0.75; the relative spectral power of violet light is less than 0.10 and the relative spectral power of 440nm blue light is less than 0.65. At least the following optical parameter requirements can be met: the color tolerance is less than 5, the color rendering index Ra is more than 90 and can be more than 97, the color rendering index R9 is more than 90, the color rendering index R12 is more than 80, the blue light color ratio is less than 5.7 percent, and the color temperature is 2700-6000K.
For the quasi-natural light, it should be mentioned that, according to the rules of a large number of traditional white lights, the white light has a higher color temperature, a higher proportion of short wavelength components, a higher blue light, and even a higher purple light, and the harm of high blue light to health is an unambiguous fact. In the optimization method of the embodiment of the invention, for the product with higher color temperature, the blue light color ratio is inhibited, and the blue light with the wavelength of 440nm can also be inhibited, so that the harm of the blue light can be avoided, and the protection of the eyesight and the body health is facilitated; meanwhile, higher color temperature can be obtained, the requirements of high-efficiency work and visual effect can be met, and the practicability is better. Such high color temperature low blue illumination light sources are difficult to implement in the prior art.
It should be further mentioned that, as shown in fig. 5 and fig. 12, in the quasi-natural light, in the case that both the spectrum and the optical parameters meet the requirements, the relative spectral power of the 640-700nm red light is significantly increased, which is also difficult to be realized in the existing near-natural light source, and mainly appears that the increase of the red light and the whole spectrum shape and other optical parameters are difficult to be compatible. It is through the above-mentioned a lot of basic research and continuous optimization process that this embodiment can obtain this quasi-natural light. The 640-700nm red light has excellent health care, physical therapy and beauty treatment effects. The conventional near-natural light source has a tendency of a significant decrease in the wavelength band after 640 nm. As shown in FIG. 12, the relative spectral power of the 640-700nm red light of the conventional white light or near-natural light source is significantly reduced, as shown in FIG. 5 and FIG. 7, the relative spectral power of the red light in this wavelength band reaches above 0.6. Wherein the relative spectral power of red light with the wavelength of 680-690 nm is more than 0.80; the relative spectral power of the red light with the wavelength of 622-680 nm is more than 0.60.
Moreover, through the test of light sources with different color temperatures, when the color temperature of quasi-natural light is 2700K-3000K, the relative spectral power of the red light with the wavelength of 640-700nm is more than 0.70; when the color temperature of quasi-natural light is 4000K-4200K, the relative spectral power of red light with the wavelength of 640-700nm is more than 0.60; when the color temperature of quasi-natural light is 5500K-6000K, the relative spectral power of red light with the wavelength of 640-700nm is more than 0.50.
It should be further mentioned that in many near-natural-light LED technologies, the blue light ratio is difficult to be increased, and the blue light is more difficult to be increased when the blue light is pulled down, and the color rendering index R12 corresponding to the blue light is also difficult to be increased. The embodiment of the invention selects the blue light chip of 457.5nm-480nm on one hand by breaking through the traditional convention (adopting 455-480nm blue light chips), and on the other hand focuses on the development of the fluorescent film, so that the relative spectral power of the cyan light is obviously improved under double-tube conditions. Meanwhile, due to the improvement of cyan light, the improvement of the color rendering index R12 also contributes to inhibiting blue light and keeping higher color temperature to a certain extent. As shown in fig. 12, the relative spectral power of cyan light in the conventional near-natural light is lower than 0.3, and as shown in fig. 5 and 7, the relative spectral power of cyan light in this embodiment reaches 0.4 or more.
Moreover, through the test of light sources with different color temperatures, when the color temperature of quasi-natural light is 2700K-3000K, the relative spectral power of cyan light in the 475-492nm waveband is more than 0.30; when the color temperature of the quasi-natural light is 4000K-4200K, the relative spectral power of the cyan light in the 475-492nm waveband is larger than 0.40; when the color temperature of quasi-natural light is 5500K-6000K, the relative spectral power of the cyan light in 475-492nm wave band is larger than 0.50.
It should be mentioned that the first light emitter and the second light emitter are driven by the same current, which is a significant improvement in the near-natural-light LED technology. The spectrum and optical parameters of the existing near-natural light LED light source are not easy to be close to natural light, but the driving by adopting the same current is more difficult. As is well known, when different chips are combined together, a current needs to be adjusted to meet a preset requirement in order to obtain a certain light, the driving currents of the chips are usually different to obtain a preset effect, and the probability of just applying the same current is almost zero. The same current is adopted to uniformly drive, the spectrum shape and the light parameters meet the requirements, and the finding of the types of white light and red light, the luminous flux and the balance point of the current is very difficult. The embodiment realizes quasi-natural light with the same current by the method, and solves the technical problem in the field for a long time.
When manufacturing the product, preferably adorn blue light chip and ruddiness chip upside down on the substrate, fluorescent film thickness is unanimous, covers on blue light chip, through equipment film forming on the chip, can guarantee that the fluorescent film uniformity of different products is good, and then can avoid the point to glue the poor problem of uniformity that causes, simultaneously for the colour temperature of different products is in same BIN position, and the colour temperature uniformity is good.
It is to be understood that the present invention is not limited to the flip chip, and the first light emitter may be formed by a flip chip structure in cooperation with the fluorescent gel.
In summary, the method for optimizing the LED light source provided by the embodiment of the present invention has the following technical effects:
first, obtain the accurate natural light that the spectrum more closely the natural light spectrum, wherein, red, orange, yellow, green, cyan light all is close with the relative spectral power of corresponding chromatic light in the natural light, compares in traditional white light illumination, and the visual perception is more comfortable, is favorable to protecting human and animal and plant's health.
Secondly, blue light and purple light harmful to human bodies are inhibited, especially the blue light with the wavelength of 440nm is inhibited, so that the eyesight protection is facilitated, and the important significance is achieved on the eyesight protection and improvement of children and infants; moreover, the method is beneficial to reducing the morbidity of people in a high blue light illumination environment for a long time and ensuring the health of people.
Third, when realizing low blue light, can realize high color temperature, and then can keep the visual effect of high definition, high discernment degree when promoting the health level, and keep good mental state, be applicable to healthy public lighting.
Fourthly, the blue light is reduced, the relative spectral power of the cyan light is improved, the color rendering index R12 is improved, and the long-term problem in the research of the near natural light is solved, so that the quasi-natural light is closer to the real natural light, and the color rendering index is further improved.
Fifthly, the relative spectral power of 640-700nm red light is improved, so that the spectrum is closer to natural light, the health care function of quasi-natural light is improved, and the health grade of quasi-natural light illumination is improved.
Sixth, while the spectrum of each band is optimized, strict optical parameter requirements such as color coordinates, color tolerance, color index and the like are maintained, so that the artificial near-natural light is a true quasi-natural light healthy light source, and the conventional artificial near-natural light is difficult to meet the requirements at the same time.
And seventhly, the first luminous body and the second luminous body are driven by the same current and are directly connected with the same group of positive and negative electrodes, a control module is not required to be designed, the LED light source is used in any lighting device, and only preset current is required to be supplied, so that the applicability of a single light source is greatly improved.
And eighthly, according to the optimization method, selecting proper first and second luminous bodies according to the determined actual luminous flux ratio, and combining the base material and the circuit to manufacture the quasi-natural light LED light source, wherein the optimized result can be directly used for manufacturing reference data of a terminal, so that chips can be conveniently selected and purchased.
Ninth, the quasi-natural light LED light source can select a micro white light luminous body and a micro red light luminous body, and select as few red light luminous bodies and white light luminous bodies as possible to manufacture the micro single light source, and the micro single light source is used in various lamps, can ensure a better light emitting effect by random combination, can not generate the problems of dark spots, bright spots or uneven mixed light, and has a good optical effect.
The structure of the quasi-natural light LED light source will be briefly described below.
Referring to fig. 9, the quasi-natural light LED light source includes a substrate layer 91, at least one set of light emitting elements 92 disposed on the substrate layer 91, and a circuit 93 electrically connected to the light emitting elements 92; each group of the light emitting assemblies 92 includes a white light emitting body 921 (the above-described first light emitting body) and a red light emitting body 922 (the above-described second light emitting body), the white light emitting body 921 includes a blue light chip and an optical conversion film (a fluorescent film or a phosphorescent film), and the red light emitting body 922 includes a red light chip; the white light emitted by the white light emitter 921 is mixed with the red light emitted by the red light emitter, which is used to compensate the missing red light portion of the white light relative to the natural spectrum, forming quasi-natural light; the quasi-natural light has the spectral and optical parameters involved in the optimization method of the present invention. Wherein, the requirements of red, green and blue wave bands on spectral power and the requirements of color temperature, color rendering index and color tolerance are at least satisfied.
Further, a reflective cup 94 is disposed on the substrate layer 91, the substrate layer 91 and the light emitting assembly 92 are disposed in the reflective cup 94, the circuit 93 is formed on the surface of the substrate layer 91 and exposed at the bottom of the reflective cup 94, and is connected to the white light emitter 921 and the red light emitter 922.
Furthermore, the fluorescent film can be uniformly formed by equipment in the manufacturing process, the product consistency is good, the reliability is high, and the light source volume is small.
The quasi-natural light LED light source selects a micro white light luminous body and a micro red light luminous body, the light radiation quantity of the red light luminous body is less than the light flux of the white light luminous body, the red light luminous body and the white light luminous body can be selected as few as possible to be manufactured into a single light source, namely, one light source is provided with a group of light emitting components. Because the light source can directly emit quasi-natural light, the light source can be used in various lamps, can be combined randomly, can ensure better light-emitting effect and has strong adaptability. Of course, multiple sets of light emitting components can be integrated into one light source, so that a better light emitting effect can be ensured and only the size is increased. The embodiment of the invention is not limited to the number of the light emitting components included in one light source.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
- A method for optical optimization of an LED light source, comprising the steps of:selecting a first light emitter, wherein the first light emitter is used for emitting white light;optimizing a spectral distribution of the first light emitter to optimize the white light to a first near-natural light;determining a waveband to be optimized of the first near natural light according to the spectral distribution of the first near natural light and the spectral distribution of the natural light;selecting a second luminophor according to the to-be-optimized waveband;determining an initial luminous flux ratio of the first illuminant and the second illuminant;optimizing the combined spectrum of the first luminophor and the second luminophor by adjusting the spectral distribution of the first luminophor and the second luminophor to obtain quasi-natural light, wherein the driving currents of the first luminophor and the second luminophor are the same or the difference is in a preset range;wherein the adjustment of the spectral distribution of the first and second light emitters comprises at least an adjustment of the drive current.
- 2. The method for optical optimization of an LED light source according to claim 1, wherein the first light emitter includes a blue light chip and an optical conversion film covering the blue light chip, the optical conversion film including a colloid and an optical conversion material uniformly mixed in the colloid;the optimizing the spectral distribution of the first light emitter to optimize the white light to a first near natural light includes:the formula and/or concentration and/or thickness of the optical conversion film are adjusted to ensure that the relative spectral power of 480-640 nm waveband in the white light emitted by the first light-emitting body is greater than 0.30, and the relative spectral power of 500-640nm waveband in the white light emitted by the first light-emitting body is greater than 0.60.
- 3. The method for optical optimization of an LED light source as claimed in claim 2,when the color temperature of the first near natural light is 2700K-3000K, the relative spectral power of 480-5 nm waveband is more than 0.30; the relative spectral power of the 500-640nm waveband is more than 0.70;when the color temperature of the first near natural light is 4000K-4200K, the relative spectral power of the 480-500nm waveband is greater than 0.45; the relative spectral power of the 500-640nm waveband is more than 0.65;when the color temperature of the first near natural light is 5500K-6000K, the relative spectral power of a 480-500nm waveband is more than 0.4; the relative spectral power of the 500-640nm waveband is more than 0.60;the relative spectral power of red light in the quasi-natural light is greater than 0.60; the relative spectral power of the cyan light is greater than 0.30; the relative spectral power of the blue light is less than 0.75.
- 4. The method for optically optimizing an LED light source according to claim 3, wherein the optical conversion film is a fluorescent film or a phosphorescent film, and the optical conversion material is a fluorescent powder or a phosphorescent powder; the phosphor for emitting the first near-natural light includes: red, green and yellow-green powders;the color coordinate of the red pink is X: 0.660 to 0.716, Y: 0.340-0.286;the color coordinate of the green powder is X: 0.064-0.081, Y: 0.488-0.507;the color coordinate of the yellow-green powder is X: 0.367 to 0.424, Y: 0.571 to 0.545;the weight ratio of the red powder to the green powder to the yellow-green powder is as follows:red powder: green powder: yellow-green powder (0.010-0.035): (0.018-0.068): 0.071-0.253);the concentration of the fluorescent film is 17% -43%.
- 5. The method as claimed in claim 3, wherein in the step of determining the band to be optimized of the first near natural light according to the spectral distribution of the first near natural light and the spectral distribution of the natural light, the band to be optimized is determined to be 640-700 nm; the second light emitter is a red light emitter for emitting red light of 640-700 nm.
- 6. The method of claim 3, wherein the step of optimizing the combined spectrum of the first and second light emitters by adjusting the spectral distributions of the first and second light emitters to obtain quasi-natural light with the same or different driving currents of the first and second light emitters within a predetermined range comprises:s1: adjusting the driving currents of the first light emitter and the second light emitter, monitoring the combined spectrum in real time, and performing step S2 when the relative spectral power of the combined spectrum reaches a predetermined range, otherwise, repeating step S1;s2: detecting an optical parameter of the combined spectrum, and performing step S3 when the optical parameter reaches a predetermined range, otherwise, returning to step S1;s3: adjusting the driving current of the first light emitter and/or the second light emitter to enable the two driving currents to be consistent;s4: adjusting the luminous flux of the first light emitter and/or the light radiation quantity of the second light emitter according to the change of the relative spectral power of the combined spectrum, monitoring the combined spectrum in real time, and performing step S5 when the relative spectral power of the combined spectrum meets a preset range, or performing step S1;s5: detecting optical parameters of the combined spectrum, confirming that quasi-natural light is obtained when the optical parameters reach a preset range, and performing step S6, otherwise performing step S1;s6: recording the actual driving current of the first luminous body and the second luminous body, the actual proportion of the luminous flux of the first luminous body and the light radiation quantity of the second luminous body and the optical parameters of quasi-natural light.
- 7. The method for optical optimization of an LED light source as claimed in claim 6,when the number of times of the step S1 is performed reaches a predetermined number of times, performing step S0:adjusting the formula and/or concentration and/or thickness of the optical conversion film, and then performing step S1;or,adjusting the central wavelength of the second light emitter, and then performing step S1;or,a third emitter having a center wavelength different from the center wavelength of the second emitter is added, and then step S1 is performed.
- 8. The method for optical optimization of LED light sources according to claim 6, wherein in step S4, the amount of light radiation of the second light emitter is selectively adjusted.
- 9. Method for the optical optimization of LED light sources according to claim 6, characterized in that the optical parameters comprise at least color temperature, color coordinates, color tolerance, color rendering index Ra, color rendering index R9, color rendering index R12 and blue light color ratio; the predetermined range of color tolerance is less than 5, the predetermined range of color rendering index Ra is greater than 90, the predetermined range of color rendering index R9 and R12 is greater than 80, and the predetermined range of blue light color ratio is less than 5.7%.
- 10. The method of optimizing an LED light source of claim 9 wherein the optical parameters further include the relative spectral power of 440nm blue light; the predetermined range of relative spectral power of the 440nm blue light is less than 0.65.
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| PCT/CN2018/095306 WO2020000512A1 (en) | 2018-06-27 | 2018-07-11 | Optimization method for quasi-natural light led light source |
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