A light source module and a lighting device

Abstract

This invention provides a light source module and an illumination device. The light source module includes: a first light-emitting unit for emitting a first white light; and a second light-emitting unit for emitting a second white light; wherein the first white light and the second white light have different relative color temperatures (CCT) and different color deviation values ​​(DUV), and are mixed to form a target white light; the target white light has a color comfort index (MCPI) ≥ 107.5, a color resolution index (CDM) ≥ 5, and a color rendering index (CRI) ≥ 95 in the visible light band. This invention solves the problems of unnatural light color and low visual comfort existing in traditional white light sources.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a light source module and a lighting device. Background Technology

[0002] The Color Rendering Index (CRI) is an important parameter for measuring the color rendering ability of a light source. The higher the CRI, the stronger the light source's ability to reproduce the colors of objects. The International Commission on Illumination (CIE) sets the CRI of sunlight at 100. Incandescent lamps have a CRI very close to that of sunlight and are therefore considered an ideal reference light source.

[0003] For a long time, CRI has been the absolute standard for evaluating the color quality of white light. This has led to the common LED light sources on the market pursuing high CRI levels by compensating for the blue-green spectrum. Although this is close to the daylight spectrum, the light source has a bluish tint, which is not a visually comfortable light source. Utility Model Content

[0004] The purpose of this invention is to provide a light source module and lighting device that can solve the problems of unnatural light color and low visual comfort of traditional white light sources.

[0005] To achieve the above objectives, the embodiments of this utility model are implemented as follows:

[0006] Firstly, a light source module is provided, comprising:

[0007] The first light-emitting unit is used to emit the first white light;

[0008] The second light-emitting unit is used to emit a second white light;

[0009] The first white light and the second white light have different relative color temperatures (CCT) and different color deviation values ​​(DUV), and they are mixed to form the target white light. The target white light has a color comfort index (MCPI) ≥ 107.5, a color resolution (CDM) ≥ 5, and a color rendering index (CRI) ≥ 95 in the visible light band.

[0010] Optionally, the relative color temperature of the first white light is 2700K±100K; the relative color temperature of the second white light is 5700K±100K; the DUV of the first white light and the second white light are in the range of -0.0055 to -0.0080; and the DUV of the target white light is in the range of -0.0055 to -0.0080.

[0011] Optionally, the relative color temperature of the first white light is 2700K±100K; the relative color temperature of the second white light is 5700K±100K; the DUV of the first white light and the second white light are in the range of -0.0005 to -0.0045; and the DUV of the target white light is in the range of -0.0055 to -0.0080.

[0012] Optionally, the color temperature difference between the first white light and the second white light is ≥2000K.

[0013] Optionally, both the first light-emitting unit and the second light-emitting unit include a blue light-emitting chip, a sealing colloid covering the blue light-emitting chip, and a phosphor mixture doped in the sealing colloid; wherein the phosphor mixture includes: at least one blue-green phosphor with a peak wavelength in the range of 485 to 515 nm; at least one yellow-green phosphor with a peak wavelength in the range of 520 to 580 nm; and at least one red-orange phosphor with a peak wavelength in the range of 615 to 655 nm.

[0014] Optionally, the blue light emitting chip includes at least one of a first blue light emitting chip, a second blue light emitting chip, and a third blue light emitting chip; the first blue light emitting chip is used to emit blue light with a peak wavelength of 435nm±5nm; the second blue light emitting chip is used to emit blue light with a peak wavelength of 450nm±5nm; and the third blue light emitting chip is used to emit blue light with a peak wavelength of 465nm±5nm.

[0015] Optionally, the spectral fit (SFR) of the target white light is greater than 85%.

[0016] Secondly, a lighting device is provided, comprising:

[0017] The light source module mentioned in the first aspect above;

[0018] A power conversion module is used to convert external power into DC power required by the light source module;

[0019] The control module is used to generate control signals that include pulse width modulation signals;

[0020] The LED control chip is used to receive the DC power supply provided by the power conversion module and the control signal provided by the control module, and adjust the DC power supply according to the control signal to output the driving current / voltage required for operation to the first light-emitting unit and the second light-emitting unit in the light source module.

[0021] Optionally, the first light-emitting unit and the second light-emitting unit each have a pulse width modulation signal with an adjustable duty cycle.

[0022] Optionally, at least a portion of the light source modules in the lighting device are packaged in an integrated COB package or in a separate independent module package.

[0023] This utility model discloses a light source module and lighting device. By combining two light-emitting units with different relative color temperatures (CCT) and color deviation values ​​(DUV), a neutral target white light is generated through light mixing. This target white light closely approximates the sunlight spectrum (CRI ≥ 95) and also possesses excellent visual perception dimensions (MCPI ≥ 107.5, CDM ≥ 5). From an aesthetic perspective, it solves the problem of the bluish and glaring light of traditional LED light sources. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a first structural schematic diagram of the light source module according to an embodiment of the present utility model.

[0026] Figure 2 This is a schematic diagram of the second structure of the light source module in an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram illustrating the first relationship between the DUV of the light source module and other light quality parameters in an embodiment of this utility model.

[0028] Figure 4 This is a first comparative schematic diagram of the emission spectrum of the light source module in this embodiment of the present invention and the D40 standard light source spectrum.

[0029] Figure 5 This is a schematic diagram illustrating the second relationship between the DUV of the light source module and other light quality parameters in an embodiment of this utility model.

[0030] Figure 6 This is a second comparative schematic diagram of the light emission spectrum of the light source module in this embodiment of the present invention and the D40 standard light source spectrum.

[0031] Figure 7 This is a schematic diagram comparing the emission spectrum of the light source module in this embodiment with that of a traditional LED light source.

[0032] Figure 8 This is a schematic diagram of the structure of the lighting device according to an embodiment of the present utility model.

[0033] Figure 9 This is a schematic diagram of the packaging method of the light source module in the lighting device according to an embodiment of the present utility model. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0035] Before introducing the present invention, some important indicators in the field of lighting will be introduced.

[0036] 1) Standard light source spectrum

[0037] Color temperature ≥ 4000K: The relative spectral distribution of the D-series standard light source specified by the International Commission on Illumination is used as the target spectrum, such as D40, D65, etc.

[0038] 2) Color Preference Index (MCPI based on Meta-analysis)

[0039] Color comfort represents the ability of a light source to meet an observer's color preferences under one or more specific application conditions. In other words, this index can be used to scientifically evaluate which light source's color rendering effect better meets the needs of visual perception. The corresponding calculation formula is:

[0040]

[0041] in, CQS stands for Light Source Fidelity Index; Qa stands for Color Quality Standard; Qa is the output index of CQS. Color discrimination is an indicator of light intensity, which is based on absolute color gamut and is used to evaluate the color discrimination ability of a light source.

[0042] 3) Color Discrimination Metric (CDM)

[0043] The color resolution index represents the degree to which an observer can distinguish color differences under different light sources. It characterizes the human eye's ability to differentiate the color, brightness, and saturation of objects under different light sources. The corresponding calculation formula is:

[0044]

[0045] in, The whiteness index prediction model for light source is calculated in the CIE1976 UCS uniform color space. The colorimetric index is a measure of the amount of hue misalignment caused by a test light source. It is calculated by using the CIE C standard light source as a practical reference and calculating based on the hue misalignment score.

[0046] 4) Spectral Fitting Ratio (SFR)

[0047] Spectral fit is used to evaluate the degree of fit between the measured spectrum and the target spectrum. This is based on the Average Spectral Difference (ASD) value published by Bridgelux Inc., USA, to calculate the spectral deviation ratio. The reference light source spectrum used is similar to the TM-30 standard published by the Illuminating Engineering Society of North America (IES). When the color temperature is above 5000K, the reference spectrum is based on the D-series standard illuminator. When the color temperature is below 4000K, the spectrum emitted by a blackbody radiation source is used as the reference. If the color temperature is between 4000K and 5000K, the spectrum emitted by a mixed light source of a 4000K blackbody radiation source and a D50 standard illuminator is used as the reference. Furthermore, considering the band distribution of human visual response, the evaluation range of spectral deviation is limited to between 425nm and 690nm. The specific calculation method is as follows:

[0048]

[0049] in, The relative intensity of the reference light source; The relative intensity of the light source to be evaluated; λ is the wavelength.

[0050] 5) Color temperature and relative color temperature

[0051] Color temperature is an important physical quantity in lighting optics used to define the color of a light source, and its unit is Kelvin (K). The definition of color temperature is based on the blackbody radiation theory, which states that when an idealized blackbody is heated to a certain temperature, the color of the light it emits is the same as the color of a certain light source; the absolute temperature of the blackbody is the color temperature of that light source.

[0052] Correlated color temperature (CCT), also known as relative color temperature, refers to the temperature of a blackbody at which the color of a light source is closest to the color of the light emitted by the source. CCT is an indicator used to describe the color characteristics of a light source, defined by comparing the similarity between the color of the light source and the color of the blackbody radiation.

[0053] 6) Color deviation (Delta u'v', Duv)

[0054] Color deviation is an indicator based on the CIE 1976 chromaticity diagram, used to describe the degree of deviation between the color of a light source and the Planckian radiance curve. Specifically, Duv represents the distance and direction between the color coordinates (u', v') of the light source and the Planckian locus. Duv is the shortest distance from the color coordinates of the light source to the blackbody locus, and is usually represented by a positive value indicating a greenish tint (closer to yellowish-green) and a negative value indicating a reddish tint (closer to magenta).

[0055] Based on the foregoing, most LED light sources on the market currently pursue high CRI levels solely through compensation of the blue-green wavelength spectrum. Although this approximates the sunlight spectrum, the light source has a bluish tint, making it visually uncomfortable (glaring). In more technical terms, this means that the Color Comfort Index (MCPI) and Color Recognition Index (CRI) do not meet the standards.

[0056] To address the aforementioned problems, this invention provides a lighting solution involving a light source module and a lighting device. The solution aims to generate a neutral target white light by combining two light-emitting units with different relative color temperatures (CCT) and color deviation values ​​(DUV). This target white light closely approximates the sunlight spectrum (CRI ≥ 95) and also exhibits excellent visual perception dimensions (MCPI ≥ 108.5, CDM ≥ 5). Visually, this solves the problem of the bluish and glaring light emitted by traditional LED light sources.

[0057] On the one hand, embodiments of this utility model provide a light source module. Figure 1 This is a schematic diagram of the structure of the light source module, including:

[0058] The first light-emitting unit 100 is used to emit first white light;

[0059] The second light-emitting unit 200 is used to emit a second white light;

[0060] Among them, the first white light and the second white light have different relative color temperatures (CCT) and different color deviation values ​​(DUV), and the light is mixed to form the target white light; the target white light has a color comfort index (MCPI) ≥ 107.5, a color resolution (CDM) ≥ 5, and a color rendering index (CRI) ≥ 95 in the visible light band.

[0061] refer to Figure 1 In the A-A' cross section, both the first light-emitting unit 100 and the second light-emitting unit 200 emit light through blue light-emitting chips. The corresponding encapsulation structure specifically uses a sealing colloid to cover the blue light-emitting chip. The sealing colloid is doped with a phosphor mixture to cooperate with the blue light to form white light.

[0062] As an example, a phosphor mixture may include:

[0063] At least one blue-green phosphor with a peak wavelength in the range of 485 to 515 nm;

[0064] At least one yellow-green phosphor with a peak wavelength in the range of 520 to 580 nm;

[0065] At least one red-orange phosphor with a peak wavelength in the range of 615 to 655 nm.

[0066] Among them, the blue-green phosphor can be (Ba,Sr)Si2N2O2:Eu; the yellow-green phosphor can be one or more of (Lu,Yb,Tb)3(Al,Ga)5O12:Ce, Y3(Al,Ga)5O12:Ce, Ga-Y3Al5O12:Ce, and (Ba,Sr,Ca,Mg)SiO4:Eu; and the red-orange phosphor can be one or more of CaAlSiN3:Eu, (Ca,Sr)AlSiN3:Eu, (Ba,Sr,Ca,Mg)2Si5N8:Eu, K2SiF6:Mn4+, K2GeF6:Mn4+, and K2TiF6:Mn4+.

[0067] It should be noted that, Figure 1 The light-emitting unit shown is for illustrative purposes only. In practical applications, the light-emitting unit can be... Figure 2 The packaging method shown may be either bracketed or bracketless; however, this article does not specify a particular packaging method.

[0068] The light source module will be introduced below in conjunction with its specific implementation method.

[0069] Implementation Method 1

[0070] In this implementation, the color temperature of the first white light is 2700K (including ±100K error), the color temperature of the second white light is 5700K (including ±100K error), and the DUV of the first and second white lights are in the range of -0.0055 to -0.0080.

[0071] The blue light-emitting cores of the first light-emitting unit 100 and the second light-emitting unit 200 adopt the following three specifications:

[0072] The first blue light-emitting chip is used to emit blue light with a peak wavelength of 435nm±5nm;

[0073] The second blue light-emitting chip is used to emit blue light with a peak wavelength of 450nm±5nm;

[0074] The third blue light-emitting chip is used to emit blue light with a peak wavelength of 465nm±5nm.

[0075] Based on the above, the configurations of the first light-emitting unit 100 and the second light-emitting unit 200 are illustrated in five examples, namely:

[0076] First light-emitting unit 100: 27a_1 to 27a_5;

[0077] Second light-emitting units: 57a_1 to 57a_5.

[0078] The corresponding configuration parameters are shown in the table below:

[0079]

[0080] Using a color temperature of 4000K as the mixing standard for the target white light, the comparison of CCT, DUV, and SFR between the first emitting unit 100 and the second emitting unit 100 is shown in the table below:

[0081]

[0082] Using a color temperature of 4000K as the mixing standard for the target white light, the comparison of CRI, MCPI, and CDM between the first emitting unit 100 and the second emitting unit 100 is shown in the table below:

[0083]

[0084] in, Figure 3 This example illustrates the CRI / MCPI / CD variation curves of target white light from two emitting units at different DUV values. Using a light source module consisting of example 27a_4 and example 57a_3 as an example, the comparison between the emission spectrum of this light source module and the spectrum of a D40 standard light source is shown below. Figure 4As shown, the lower the color deviation value of the two light-emitting units, the lower the color deviation value of the resulting target white light. The corresponding color rendering index decreases synchronously due to the distance from the blackbody radiation line, but the MCPI and CDM are improved. From the perspective of spectral distribution, the increase in blue energy helps to improve the whiteness of the light source, thereby improving the light source's ability to distinguish the color of the illuminated object. The increase in red energy helps to improve the comfort of the light source's color, thereby improving the light source's preference for the color of the illuminated object. On the other hand, with blue and red remaining basically unchanged, the decrease in green energy (including yellow) will help to improve color preference and resolution.

[0085] It can be seen that the DUV of the target white light ultimately formed by the first method is in the range of -0.0055 to -0.0080, and the corresponding light quality parameters are as follows:

[0086] Color rendering index: CRI (Ra) ≥ 95;

[0087] Color comfort: MCPI ≥ 107.5, with most examples exceeding 108.5;

[0088] Color resolution index: CDM≥5;

[0089] Spectral fit: SFR ≥ 85%.

[0090] Implementation Method Two

[0091] In this implementation, the color temperature of the first white light is 3000K (including ±100K error), the color temperature of the second white light is 6500K (including ±100K error), and the DUV of the first and second white lights are in the range of -0.0055 to -0.0080.

[0092] The blue light-emitting cores of the first light-emitting unit 100 and the second light-emitting unit 200 adopt the following three specifications:

[0093] The first blue light-emitting chip is used to emit blue light with a peak wavelength of 435nm±5nm;

[0094] The second blue light-emitting chip is used to emit blue light with a peak wavelength of 450nm±5nm;

[0095] The third blue light-emitting chip is used to emit blue light with a peak wavelength of 465nm±5nm.

[0096] Based on the above, the configurations of the first light-emitting unit 100 and the second light-emitting unit 200 are illustrated in five examples, namely:

[0097] First light-emitting unit 100: 30a_1 to 30a_5;

[0098] Second light-emitting units: 65a_1 to 65a_5.

[0099] The corresponding configuration parameters are shown in the table below:

[0100]

[0101] Using a color temperature of 4000K as the mixing standard for the target white light, the comparison of CCT, DUV, and SFR between the first emitting unit 100 and the second emitting unit 100 is shown in the table below:

[0102]

[0103] Using a color temperature of 4000K as the mixing standard for the target white light, the comparison of CCT, DUV, and SFR between the first emitting unit 100 and the second emitting unit 100 is shown in the table below:

[0104]

[0105] in, Figure 5 This example illustrates the CRI / MCPI / CD variation curves of the target white light under different DUV values ​​for two emitting units. Here, we take a light source module consisting of the 30a_5 example and the 65a_3 example as an example, and compare the emission spectrum of this light source module with the spectrum of a D40 standard light source. Figure 6 As shown, the lower the color deviation value of the two light-emitting units, the lower the color deviation value of the resulting target white light. The corresponding color rendering index decreases synchronously due to the distance from the blackbody radiation line, but the MCPI and CDM are improved. From the perspective of spectral distribution, the increase in blue energy helps to improve the whiteness of the light source, thereby improving the light source's ability to distinguish the color of the illuminated object. The increase in red energy helps to improve the comfort of the light source's color, thereby improving the light source's preference for the color of the illuminated object. On the other hand, with blue and red remaining basically unchanged, the decrease in green energy (including yellow) will help to improve color preference and resolution.

[0106] It can be seen that the DUV of the target white light ultimately formed by the second method is in the range of -0.0055 to -0.0080, and the corresponding light quality parameters are as follows:

[0107] Color rendering index: CRI (Ra) ≥ 95;

[0108] Color comfort: MCPI ≥ 108.5;

[0109] Color resolution index: CDM≥5;

[0110] Spectral fit: SFR ≥ 85%.

[0111] Based on the two implementation methods described above, the output spectrum of the light source module in this embodiment is compared with the output spectrum of traditional LEDs, etc. Figure 7 As shown.

[0112] In addition, another embodiment of this utility model provides a lighting device. Figure 7 This is a schematic diagram of the lighting device, including:

[0113] Multiple of the aforementioned light source modules 10;

[0114] The power conversion module 20 is used to convert external power into DC power required by the light source module 10; wherein, Figure 7 In the diagram, L represents the live wire of the external power supply, and N represents the neutral wire of the external power supply.

[0115] Control module 30 is used to generate control signals;

[0116] LED control chip 40 is used to receive DC power from power conversion module 20 and control signal from control module 30, and adjust DC power according to control signal to output driving current / voltage required for operation to the first light-emitting unit 100, second light-emitting unit 200 and deep red light-emitting unit 300 in light source module 10.

[0117] It should be noted that the DC power supplied to the power conversion module 20 and the current / voltage supplied to the light source module to drive the light emission are functions that can be achieved by existing LED control chips. This embodiment does not involve any program improvements to the LED control chip.

[0118] Optionally, the first light-emitting unit 100 and the second light-emitting unit 200 in the light source module 10 are independently controlled by the LED control chip 40. The control signal is a PWM signal with an adjustable duty cycle for each of the first light-emitting unit 100 and the second light-emitting unit 200. PWM is a periodic square wave signal that changes the average power output of each light-emitting unit by adjusting the high-level time (duty cycle). The duty cycle refers to the percentage of the high-level time in the entire cycle; the higher the duty cycle, the stronger the LED brightness.

[0119] In practical applications, the lighting device in this embodiment can be various types of lamps, such as chandeliers and ceiling lights, etc., which are not specifically limited here. In addition, it can also include controllers, heat dissipation devices, and light distribution components, depending on the function and requirements of the specific lamp. The controller can be used to adjust the color and intensity of the light emitted by the light source module, while the light distribution components, in addition to the diffuser plate in the embodiment, can also be lampshades, lenses, diffusion elements, light guides, etc.

[0120] Furthermore, this embodiment does not specifically limit the overall packaging method of the above-mentioned multiple light source modules 10, but refers to... Figure 8 As shown, at least some of the light source modules 10 in the lighting device can be integrated into a COB package or be packaged as separate independent modules.

[0121] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0122] In the embodiments provided by this utility model, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0123] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0124] The above are merely embodiments of this disclosure and are not intended to limit the scope of this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of the claims of this disclosure.

Claims

1. A light source module, characterized by include: The first light-emitting unit is used to emit the first white light; The second light-emitting unit is used to emit a second white light; The first white light and the second white light have different relative color temperatures (CCT) and different color deviation values ​​(DUV), and they are mixed to form the target white light. The target white light has a color comfort index (MCPI) ≥ 107.5, a color resolution (CDM) ≥ 5, and a color rendering index (CRI) ≥ 95 in the visible light band.

2. The light source module according to claim 1, characterized in that, The color temperature of the first white light is 2700K±100K; The color temperature of the second white light is 5700K±100K; The DUV values ​​of the first white light and the second white light are in the range of -0.0055 to -0.0080; The DUV of the target white light is in the range of -0.0055 to -0.0080.

3. The light source module according to claim 1, characterized in that, The color temperature of the first white light is 3000K±100K; The color temperature of the second white light is 6500K±100K; The DUV values ​​of the first white light and the second white light are in the range of -0.0005 to -0.0045; The DUV of the target white light is in the range of -0.0055 to -0.0080.

4. The light source module according to claim 1, characterized in that, The color temperature difference between the first white light and the second white light is ≥2000K.

5. The light source module according to claim 1, characterized in that, Both the first light-emitting unit and the second light-emitting unit include a blue light-emitting chip, a sealing colloid covering the blue light-emitting chip, and a phosphor mixture doped in the sealing colloid; The phosphor mixture includes: At least one blue-green phosphor with a peak wavelength in the range of 485 to 515 nm; At least one yellow-green phosphor with a peak wavelength in the range of 520 to 580 nm; At least one red-orange phosphor with a peak wavelength in the range of 615 to 655 nm.

6. The light source module according to claim 5, characterized in that, The blue light emitting chip includes at least one of a first blue light emitting chip, a second blue light emitting chip, and a third blue light emitting chip; wherein the first blue light emitting chip is used to emit blue light with a peak wavelength of 435nm±5nm; the second blue light emitting chip is used to emit blue light with a peak wavelength of 450nm±5nm; and the third blue light emitting chip is used to emit blue light with a peak wavelength of 465nm±5nm.

7. The light source module according to any one of claims 1 to 6, characterized in that, The spectral fit (SFR) of the target white light is greater than 85%.

8. An illumination device, characterized by include: Multiple light source modules as described in any one of claims 1 to 7; A power conversion module is used to convert external power into DC power required by the light source module; The control module is used to generate control signals that include pulse width modulation signals; The LED control chip is used to receive the DC power supply provided by the power conversion module and the control signal provided by the control module, and adjust the DC power supply according to the control signal to output the driving current / voltage required for operation to the first light-emitting unit and the second light-emitting unit in the light source module.

9. The lighting device according to claim 8, characterized in that, The first light-emitting unit and the second light-emitting unit each have their own pulse width modulation signal with adjustable duty cycle.

10. The lighting device according to claim 8, characterized in that, At least a portion of the light source modules in the lighting device are packaged using integrated COB packaging or using separate independent module packaging.

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