阅读说明：本技术 一种光源模组及包括该光源模组的照明装置 (Light source module and lighting device comprising same ) 是由 周志贤 于 2021-08-20 设计创作，主要内容包括：一种光源模组及包括该光源模组的照明装置,包括第一发光元件和覆盖于第一发光元件的封装部,所述封装部包括：第一荧光体、第二荧光体,光源模组的发射光在CIE1931色空间上,位于相关色温1450～1750K与黑体轨迹的距离duv=-0.005～0.005的点围成的区间内。本发明所提供的光源模组和照明装置发出类似热辐射、发射光谱连续、低蓝光的LED照明灯具,其光色呈暖黄色,光谱在在380～660nm范围内与热辐射光谱分布有较高的相似度,因而具有较低的M/P值,可促进快速入眠。(The utility model provides a light source module reaches lighting device including this light source module, includes first light emitting component and covers the encapsulation portion of first light emitting component, the encapsulation portion includes: the light source module comprises a first phosphor, a second phosphor and a light source module, wherein the light emitted by the light source module is located in an interval surrounded by points with correlated color temperatures 1450-1750K and blackbody tracks at distances duv = -0.005. The LED illuminating lamp with the light source module and the illuminating device which emit similar heat radiation, continuous emission spectrum and low blue light has warm yellow light color, and the spectrum is distributed with high similarity to the heat radiation spectrum in the range of 380-660 nm, so that the LED illuminating lamp has a low M/P value and can promote quick sleep.)

1. A light source module is characterized in that the light source module comprises a first light emitting element and a packaging part covering the first light emitting element,

the first light-emitting element emits first color light with the peak wavelength being 390-470 nm;

the package portion includes:

a first phosphor arranged to emit a second color light having a peak wavelength of 520 to 560nm after being excited by the first color light;

a second phosphor arranged to emit a third color light having a peak wavelength of 610 to 660nm and a half width of 80 to 100nm after being excited by the first color light,

the first color, the second color light and the third color light are mixed to form the emitting light of the light source module, and the emitting light is located in an interval surrounded by points of a correlated color temperature 1450-1750K and a blackbody locus at a distance duv = -0.005 on a CIE1931 color space.

2. The light source module as claimed in claim 1, wherein the first light emitting element is an LED chip; the first fluorophor is green phosphor, yellow phosphor, and phosphor combination at least containing one of green phosphor and yellow phosphor; the first fluorescent body is red fluorescent powder, orange fluorescent powder, and a fluorescent powder combination at least comprising one of red fluorescent powder and orange fluorescent powder.

3. The light source module of claim 2, wherein the weight ratio of the second phosphor to the first phosphor is 10% to 60%.

4. The light source module as claimed in claim 3, wherein the encapsulation portion further includes a base material, and the first phosphor, the second phosphor and the base material are uniformly mixed and then coated on the first light emitting element.

5. The light source module as claimed in claim 4, wherein the base material is a transparent silica gel or a transparent resin, and the weight ratio of the first phosphor to the second phosphor to the base material is 50% to 120%.

6. The light source module of claim 5, wherein the encapsulation further comprises a light diffuser, the light diffuser being one of nano-scale titanium oxide, aluminum oxide, or silicon oxide, the weight ratio of the light diffuser to the base material being less than 3.0%.

7. The light source module as claimed in claim 2, wherein the green phosphor and the yellow phosphor are aluminate phosphor represented by formula Y₃Al₅O₁₂:Ce³⁺、Lu₃Al₅O₁₂:Ce³⁺、Y₃(Al,Ga)₅O₁₂:Ce³⁺、Tb₃Al₅O₁₂:Ce³⁺；

Or silicate system fluorescent powder with chemical formula (Ca, Sr, Ba)₂(Mg,Zn)Si₂O₇:Eu²⁺、 (Ca,Sr,Ba)₂MgSi₃O₅:Eu²⁺、β-(Sr,Ba,Ca)₂SiO₄:Eu²⁺、α-(Sr,Ba,Ca)₂SiO₄:Eu²⁺；

Or nitrogen oxide system fluorescent powder with the chemical formula of beta- (Sr, Ca) SiAlON: Eu²⁺、α-(Sr,Ca)SiAlON:Eu²⁺。

8. The light source module as claimed in claim 2, wherein the red phosphor and the orange phosphor are nitride phosphor represented by formula (Sr, Ba)₂Si₅N₈:Eu²⁺、(Sr,Ca,Ba)SiAlN₃:Eu²⁺。

9. The light source module as claimed in any one of claims 2-8, wherein the color of the emitted light is within an ellipse of a central point x0=0.571, y0=0.402, a major axis a =0.00229, a minor axis b =0.00129, a tilt angle θ =38.7 °, and SDCM =5.0 in CIE1931 color space.

10. The light source module according to any one of claims 2-8, wherein a first peak is formed in the emission spectrum with a maximum spectral intensity in a range of more than 610nm, a second peak is formed in the emission spectrum with a peak intensity in a range of 390-470 nm, and the peak intensity of the second peak is 12.0% or less of the peak intensity of the first peak.

11. The light source module as claimed in any one of claims 2-8, wherein the spectrum of the emitted light has a ratio M/P of blackout illumination M to photopic illumination P of less than or equal to 0.20 in the visible light range.

12. The light source module of any one of claims 2-8, wherein the emitted light spectrum has a similarity S ≥ 78% in the range of 380-660 nm as compared with a blackbody radiation spectrum having the same color temperature and brightness.

13. An illumination device, comprising: the light source module according to any one of claims 1 to 12.

Technical Field

The invention relates to a light source module and a lighting device comprising the same.

Background

With the arrival and development of the third lighting technology revolution, incandescent lamps, halogen lamps and the like have been gradually banned from production and sale by countries all over the world due to low lighting efficiency and no energy saving, and LED lighting fixtures have been widely used instead. With the development of LED lighting applications, research on LED lighting is not limited to energy saving, illumination, color and color rendering, etc., and it has become a trend to research on the influence of LED lighting on human body, and the concept of healthy lighting gradually moves into common families.

At present, under the common household environment in the market, aiming at the LED lamps used at night or before sleeping, LEDs of 2700K and 3000K are mainly used, and the light color of the LED lamps is warm white. Although this color of light has been drawn as close as possible to the incandescent lamp, it still differs greatly from the color of the incandescent lamp and does not give a warm and comfortable feeling to people. In addition, the warm white light currently provided on the market is only warmer in color temperature, and cannot promote quick sleep. Therefore, the invention provides an LED light source which is suitable for being used at night and can promote falling asleep while realizing the lighting function.

Disclosure of Invention

The present invention is directed to solving the above-mentioned problems, and an object of the present invention is to provide a light source module suitable for night use and capable of promoting sleep, and a lighting device including the light source module.

In order to achieve the above-mentioned functions, the present invention provides a light source module, which comprises a first light emitting device and a package portion covering the first light emitting device,

the first light-emitting element emits first color light with the peak wavelength being 390-470 nm;

the package portion includes:

a first phosphor arranged to emit a second color light having a peak wavelength of 520 to 560nm after being excited by the first color light;

a second phosphor arranged to emit a third color light having a peak wavelength of 610 to 660nm and a half width of 80 to 100nm after being excited by the first color light,

the first color, the second color light and the third color light are mixed to form the emitting light of the light source module, and the emitting light is located in an interval surrounded by points of a correlated color temperature 1450-1750K and a blackbody locus at a distance duv = -0.005 on a CIE1931 color space.

Preferably, the first light emitting element is an LED chip; the first fluorophor is green phosphor, yellow phosphor, and phosphor combination at least containing one of green phosphor and yellow phosphor; the first fluorescent body is red fluorescent powder, orange fluorescent powder, and a fluorescent powder combination at least comprising one of red fluorescent powder and orange fluorescent powder.

Preferably, the weight ratio of the second phosphor to the first phosphor is 10% to 60%.

Preferably, the encapsulation portion further includes a base material, and the first phosphor, the second phosphor and the base material are uniformly mixed and then coated on the first light emitting element.

Preferably, the base material is transparent silica gel and transparent resin, and the weight ratio of the sum of the weight of the first phosphor and the second phosphor to the weight of the base material is 50% -120%.

Preferably, the encapsulation portion further includes a light diffusing agent, the light diffusing agent is one of nano-scale titanium oxide, aluminum oxide or silicon oxide, and the weight ratio of the light diffusing agent to the base material is less than 3.0%.

Preferably, the green phosphor and the yellow phosphor are aluminate system phosphors, and the formula is Y₃Al₅O₁₂:Ce³⁺、Lu₃Al₅O₁₂:Ce³⁺、Y₃(Al,Ga)₅O₁₂:Ce³⁺、Tb₃Al₅O₁₂:Ce³⁺；

Or silicate system fluorescent powder with chemical formula (Ca, Sr, Ba)₂(Mg,Zn)Si₂O₇:Eu²⁺、 (Ca,Sr,Ba)₂MgSi₃O₅:Eu²⁺、β-(Sr,Ba,Ca)₂SiO₄:Eu²⁺、α-(Sr,Ba,Ca)₂SiO₄:Eu²⁺；

Or nitrogen oxide system fluorescent powder with the chemical formula of beta- (Sr, Ca) SiAlON: Eu²⁺、α-(Sr,Ca)SiAlON:Eu^{2 +}。

Preferably, the red phosphor and the orange phosphor are nitride system phosphors, and have chemical formulas (Sr, Ba)₂Si₅N₈:Eu²⁺、(Sr,Ca,Ba)SiAlN₃:Eu²⁺。

Preferably, the color of the emitted light is in CIE1931 color space within an ellipse having a center point x0=0.571, a center point y0=0.402, a major axis a =0.00229, a minor axis b =0.00129, an inclination angle θ =38.7 °, SDCM = 5.0.

Preferably, the maximum value of the spectral intensity in the emission spectrum is located in a range greater than 610nm, a first peak is formed, a second peak is formed in a range of 390-470 nm in the emission spectrum, and the peak intensity of the second peak is less than or equal to 12.0% of the peak intensity of the first peak.

Preferably, the spectrum of the emitted light has a ratio M/P of blackout pixel luminance M to photopic luminance P ≦ 0.20 in the visible light range.

Preferably, the similarity S of the emission spectrum is more than or equal to 78% in the range of 380-660 nm compared with the blackbody radiation spectrum with the same color temperature and brightness.

The invention also provides a lighting device which comprises the light source module.

The application provides a give off similar heat radiation, emission spectrum is continuous, LED illumination lamps and lanterns of low blue light, and its photochromic is warm yellow, and the spectrum distributes with the heat radiation spectrum in 380~660nm within range has higher similarity, therefore has lower M/P value, can promote fast falling asleep.

Drawings

FIG. 1 is a schematic structural diagram of a light source module according to a preferred embodiment of the present invention;

FIG. 2 is a CIE1931 color coordinate diagram according to the preferred embodiments 1-7 of the present invention;

FIG. 3 is a comparison graph of spectra of preferred embodiment 1 and prior art in accordance with the present invention;

FIG. 4 is a relative spectral power distribution diagram of the preferred embodiment 1 of the present invention;

FIG. 5 is a comparison of the reference spectra and preferred example 1 of the present invention;

FIG. 6 is a relative spectral power distribution diagram of the preferred embodiment 2 of the present invention;

FIG. 7 is a comparison of the reference spectra and preferred example 2 of the present invention;

FIG. 8 is a relative spectral power distribution diagram of the preferred embodiment 3 of the present invention;

FIG. 9 is a comparison of the reference spectra and preferred example 3 of the present invention;

FIG. 10 is a relative spectral power distribution diagram of the preferred embodiment 4 of the present invention;

FIG. 11 is a comparison of the reference spectra and preferred example 4 of the present invention;

FIG. 12 is a relative spectral power distribution diagram of the preferred embodiment 5 of the present invention;

FIG. 13 is a comparison of the reference spectra and preferred example 5 of the present invention;

FIG. 14 is a relative spectral power distribution diagram of the preferred embodiment 6 of the present invention;

FIG. 15 is a comparison of the reference spectra and preferred example 6 of the present invention;

FIG. 16 is a relative spectral power distribution diagram of the preferred embodiment 7 of the present invention;

FIG. 17 is a comparison of the reference spectra and preferred example 7 of the present invention;

fig. 18 is a schematic structural view of a lamp according to a preferred embodiment of the present invention.

Detailed Description

The light source module and the lighting device according to the present invention will be described in detail with reference to the accompanying drawings and some preferred embodiments according to the present invention.

One embodiment of the light source module L1 of the present invention is a mixed white LED package chip, which can be a general chip-on-chip package or COB package LED chip as shown in fig. 1, and the light source module L1 includes at least a first light emitting element 1 and a package portion 2 covering the first light emitting element.

The first light-emitting element 1 is a blue light LED chip, and is directly excited by a semiconductor material to emit light, wherein a peak wavelength of the light emission is 390-470 nm, and a light color is purple or blue, and here, the light emitted by the first light-emitting element 1 is referred to as a first color light. The LED Chip (LED Chip) comprises a positive mounting or a reverse mounting, and a single LED Chip or a plurality of LED chips are connected together in series, parallel or series-parallel.

The package portion 2 uses transparent silicone or transparent resin as the base material 204, wherein the transparent resin may be one of epoxy resin and urea resin. The base material 204 is doped with the first phosphor 201 and the second phosphor 202.

The first phosphor 201 is a green phosphor or a yellow phosphor containing at least one of green phosphor and yellow phosphor having a peak wavelength of 520-560 nm, that is, the first phosphor 201 receives a part of the light emitted from the first light emitting element 1 and converts the light into a second color light having a peak wavelength of 520-580 nm. Since color is a human visual perception, the spectral boundaries of yellow and green cannot be accurately divided, where we consider green or yellow phosphors to be the only differences in the names of the uses, the two have essentially the same chemical formula, differing only in the molar ratios of the components therein. In the present application, the first phosphor 201 may be a single yellow phosphor or a single green phosphor, or may be a mixture of a plurality of yellow phosphors or green phosphors having a peak wavelength of 520 to 560nm as the first phosphor 201. The green phosphor and the yellow phosphor can be aluminate system phosphor with a chemical formula of Y₃Al₅O₁₂:Ce³⁺、Lu₃Al₅O₁₂:Ce³⁺、Y₃(Al,Ga)₅O₁₂:Ce³⁺、Tb₃Al₅O₁₂:Ce³⁺(ii) a Or silicate system fluorescent powder with chemical formula (Ca, Sr, Ba)₂(Mg,Zn)Si₂O₇:Eu²⁺、 (Ca,Sr,Ba)₂MgSi₃O₅:Eu²⁺、β-(Sr,Ba,Ca)₂SiO₄:Eu²⁺、α-(Sr,Ba,Ca)₂SiO₄:Eu²⁺(ii) a Or nitrogen oxide system fluorescent powder with the chemical formula of beta- (Sr, Ca) SiAlON: Eu²⁺、α-(Sr,Ca)SiAlON:Eu²⁺. The above formula is a basic formula, the molar ratio is not very precise in practical application of the phosphor, and the difference in molar ratio affects the peak wavelength of the phosphor, as can be understood by those skilled in the art.

The second phosphor 202 is a red phosphor or an orange phosphor containing at least one of the red phosphors or the orange phosphors with a peak wavelength of 610-660 nm, that is, the second phosphor 202 receives a part of the light emitted from the first light emitting element 1, andthe light is converted into third color light with the peak wavelength of 610-660 nm, preferably 630-660 nm and the half width of 80-100 nm. In the present application, the second phosphor 202 may be a single red phosphor or orange phosphor, or a mixture of a plurality of red phosphors or orange phosphors with a peak wavelength of 520-560 nm may be selected as the second phosphor 202. The red phosphor and the orange phosphor are nitride system phosphors with chemical formulas (Sr, Ba)₂Si₅N₈:Eu²⁺、(Sr,Ca,Ba)SiAlN₃:Eu²⁺。

The encapsulating portion 2 may further include a light diffusing agent 203, which may be one of nano-scale titanium oxide, aluminum oxide, or silicon oxide. In the present embodiment, the weight ratio of the base material 204 to the sum of the weight of the first phosphor 201 and the second phosphor 202 is 50% to 120%, wherein the weight ratio of the second phosphor 202 to the first phosphor 201 is 10% to 60%, preferably 25% to 40%. The weight ratio of the light diffusing agent 203 to the base material 204 is less than 3.0%. The fluorescent powder and the light diffusing agent are weighed in proportion and mixed into the base material 204, the mixture is fully and uniformly stirred on a stirrer, so that the fluorescent powder and the light diffusing agent are uniformly distributed in the base material 204, and after bubbles are removed, the base material 204 mixed with the fluorescent powder is covered above an LED chip serving as the first light-emitting element 1 by using a dispenser to form a packaging part 2.

The light source module L1, after the package is completed, emits light obtained by mixing the first color light emitted from the first light emitting element 1, the second color light emitted from the first phosphor 201, and the third color light emitted from the second phosphor 202. The color temperature of the emitted light of the light source module L1 is 1450K-1750K, the distance Duv between the light source module L and the black body locus BBL on a CIE1931 chromaticity diagram is [ -0.005, 0.005], and the light source module L1 is represented as an A2 area in FIG. 2. More preferably, the color of the emitted light is located in CIE1931 color space within an ellipse having a center point x0=0.571, a center point y0=0.402, a major axis a =0.00229, a minor axis b =0.00129, a tilt angle θ =38.7 °, and SDCM =5.0, and is represented as an a1 region in fig. 2.

The emitted light of the light source module L1 is further characterized in that the maximum value of the spectral intensity of the emitted light is located in a range greater than 610nm, i.e. the red light segment is formed with a first peak; the emission spectrum is in the range of 390-470 nm, that is, the blue light section is formed with a second peak, wherein the peak intensity of the second peak is less than or equal to 12.0% of the peak intensity of the first peak, preferably less than or equal to 8.0% of the peak intensity of the first peak. Such a spectral distribution is shown in fig. 3, which has less blue light energy and yellow color compared to typical warm white light in the prior art, and is more suitable for night use.

Meanwhile, the light emitting spectrum of the light source module L1 is continuous, and is very close to the blackbody radiation spectrum with the same color temperature and brightness in the range of 380-660 nm, and in order to illustrate the similarity, the similarity S is defined as follows:

a (λ) is the spectral distribution of the emitted light;

p (lambda) is the spectral distribution of the black body radiation having the same color temperature as the emitted light.

The similarity S of the light emitted by the light source module L1 and the blackbody radiation spectrum with the same color temperature and brightness is more than or equal to 78%, and the preferred similarity S is more than or equal to 85%.

The ratio M/P of the blackout luminance to the photopic luminance of the light emitted from the light source module L1 is less than or equal to 0.20, preferably less than or equal to 0.16, and the light color with the above characteristics can promote quick sleep. Traditionally, we thought that there were two types of photoreceptor cells in the retina of our eye, one that could distinguish light from shade, and the other that could distinguish color. In bright places, only the cone cells among the visual cells act, and viewing an object in this state is called photopic vision. The curve dividing the sensitivity of the cone cells by the spectral frequency is called the photopic sensitivity curve. Scientists now believe that there is also a third type of photoreceptor cell present in the retina, the melanopsin retinal ganglion cells (ipRGCs). Melanopsin retinal ganglion cells (ipRGCs) are responsible for sensing light intensity and transmitting signals to the pineal gland. Whereas the pine cone of the human brain secretes a hormone: melatonin, a "natural hypnotic", is a spontaneous "rest signal" of our body. When the melatonin content in the body is high, people can be drowsy; when the melatonin content is low, the mind is aroused. The curve that divides the sensitivity of ipRGCs by spectral frequency is called the melanopsin light sensitivity curve.

The specific formula of the ratio M/P of the blackout pixel illumination to the photopic illumination is as follows:

a (λ) is the spectral distribution of the emitted light;

mel (λ) is the melanopsin light sensitivity curve;

v (lambda) is the photopic sensitivity curve.

Having described one embodiment of the present application, several embodiments using this embodiment are exemplified below, and table 1 shows 6 embodiments of the present application, and the selection of the first light emitting element 1, the first parasitic light emitter 201, and the second parasitic light emitter 202 and the peak wavelength of light generated by them in each of the embodiments. The weight of the phosphor light, diffuser 203, base material 204, etc. are also indicated.

TABLE 1

As can be seen from table 1, for the first light emitting element 1, blue chips are used in all of the 6 embodiments provided in the present application, but the peak wavelengths of the chips are selected to be different in each embodiment. The first phosphor 201 of embodiments 1 to 4 is yellow phosphor of aluminate structure with molecular formula of Y₃Al₅O₁₂:Ce³⁺Although the molecular formula is the same, the type selected in example 1 is different from examples 2 to 4, and therefore, the peak wavelengths thereof are also different. Example 5 Green phosphor of aluminate Structure with molecular formula Y₃(Al,Ga)₅O₁₂:Ce³⁺The peak wavelength was 535 nm. Example 5 is an aluminate structure green phosphor having a molecular formula of Lu₃Al₅O₁₂:Ce³⁺The peak wavelength was 535 nm. Examples 1 toThe second phosphors 202 in 6 are all nitride system red phosphors of the same kind, and the molecular formula is (Sr, Ca, Ba) SiAlN₃:Eu²⁺The emission peak wavelengths are different, and the numbers 1, 2 and 3 are respectively marked in the table. Nano TiO is used in examples 1 to 4₂Examples 5 and 6 did not contain a light diffusing agent as a light diffusing agent.

The phosphor weights of the embodiments in table 1 are data of the sample chips of the light source module L1, and actually, the phosphor weights of different batches are slightly different in mass production, but the ratio of the phosphor weights is basically within a fixed range to ensure the specific light color and spectral characteristics proposed in the present application. Wt2/wt1 in Table 1 indicates the weight ratio of the second phosphor 202 to the first phosphor 201, and the ratio is substantially in the range of 30% to 35% in the table, considering that the actual range of phosphor batches may be expanded to 25% to 40%, and the ratio of the total amount of the different types of phosphors selected and exemplified may be expanded to 10% to 60%. However, the red and orange phosphors used as the second phosphor 202 are basically smaller than the yellow and green phosphors used as the first phosphor 201. (wt1+ wt2)/wt3 represents the weight ratio of the sum of the weights of the first phosphor 201 and the second phosphor 202 to the base material 204, and the values in the table are substantially 90 to 100%, and the actual range may be extended to 50 to 120% in consideration of the kinds of phosphors.

In addition to the above examples, the present application provides another preferred embodiment, in which the light source module L1 includes a red LED chip in addition to a red or orange phosphor, and the phosphor and the chip cooperate to enhance the energy of the red light portion, so as to ensure that the peak intensity of the second peak is less than or equal to the peak intensity of the first peak. According to this embodiment, the present application also provides example 7, in which example 7 the first light emitting element 1 is a blue LED having a peak wavelength of 408 nm. The first phosphor 201 is yellow phosphor with aluminate structure peak wavelength of 565nm and molecular formula of Y₃Al₅O₁₂:Ce³⁺The weight of the powder was 7.57 g. The second phosphor 202 is a nitride red phosphor with a peak wavelength of 635nm, and the moleculesIs (Sr, Ca, Ba) SiAlN₃:Eu²⁺The weight of the powder was 2.63 g. In addition, the light source module L1 further includes a red LED with a peak wavelength of 660 nm. The base material 204 was a 10g weight of clear silica gel. The first phosphor 201 and the second phosphor 202 are mixed in the base material 204 and then fully and uniformly mixed in a stirrer, and the mixture is coated on a blue LED chip with a main emission peak of 408nm and a red LED chip with a main emission peak of 660nm, and is dried to remove bubbles to obtain a warm yellow LED chip, so that the preparation of the light source module L1 is completed.

The positions of the light colors of the emitted light of examples 1-7 on the CIE1931 color space are shown in FIG. 2. Fig. 4, 6, 8, 10, 12, 14 and 16 are relative spectral power distribution diagrams of examples 1 to 7, respectively, and fig. 5, 7, 9, 11, 13, 15 and 17 are comparative diagrams of examples 1 to 7 and reference spectra, respectively, wherein each reference spectrum is a blackbody radiation spectral distribution having the same color temperature as the emitted light of the corresponding example. The emission characteristics and spectral characteristics of the light emitted from examples 1 to 7 are shown in Table 2.

TABLE 2

Rows 1-7 in table 2 correspond to examples 1-7, and row 8 is the emission characteristic of typical warm white light of the prior art in fig. 3. In the table, two columns x and y respectively represent coordinate values of the light color of the light emitted from the light source module L1 on the x and y axes of the CIE1931 color coordinate system. The specific positions of the examples on the CIE1931 color coordinates are shown in FIG. 2, and all the points are found to fall within the interval enclosed by the points with the correlated color temperatures 1450-1750K and the black body locus distance duv = -0.005, namely the illustrated area A2. After user experiments on these embodiments in the later stages, we found that embodiments 1-4 performed better, and from fig. 2 we found that these points all fall within the illustrated region a1, where region a1 is an ellipse with center point x0=0.571, y0=0.402, major axis a =0.00229, minor axis b =0.00129, inclination angle θ =38.7 °, SDCM = 5.0.

In table 2, CCT is color temperature, and duv indicates the distance and direction of the color shift from the planckian locus in the color coordinate system. The similarity S and M/P are obtained by the calculation formula in the application document, the similarity S in each embodiment is more than 78%, and the similarity S in more preferable embodiments 1-4 is more than 82%. M/P is less than 0.16. In the table, I2/I1 represents the ratio of the peak intensity of the second peak to the peak intensity of the first peak, and it can be seen that the peak intensity of the second peak is 12.0% or less of the peak intensity of the first peak in each example. CRI is color rendering index. From Table 2, it can be seen that the emitted light of the light source module L1 of all the embodiments has a high color rendering index, and the CRI is greater than or equal to 80.0.

Fig. 18 shows a lighting device D1 according to a preferred embodiment of the present invention, in which the light source module L1 can be applied to various lamps. The lighting device D1 is a lamp panel, and in other preferred embodiments, it may be a ceiling lamp, or the light source module L1 may also be applied to various lamps such as a table lamp, a down lamp, or a spot lamp. The lighting device D1 includes a chassis 6, a face frame 8 provided with a diffusion plate 9, a light source module L1 provided on the light source plate 5, and a power supply module 7 providing electric power required for operation to the light source module L1, and the lighting device D1 may further include a controller, a heat sink, and a light distribution member according to the function and the requirement of a specific lamp. The controller may be used to adjust the color and intensity of the illumination light emitted by the light source module L1, and the light distribution component may be a lampshade, a lens, a diffusion element, a light guide, etc. besides the diffusion plate in the embodiment. This is not a limitation of the present application.

The foregoing description of the preferred embodiments of the present application has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the application to the precise forms disclosed, and it will be apparent that numerous modifications and variations may be made thereto, which may be apparent to those skilled in the art, and are intended to be included within the scope of the application as defined by the appended claims.