Multi-cell combined light emitting light source

Abstract

This invention provides a multi-unit combined light source, wherein the multi-unit combined light source includes a white light unit having a continuous emission spectrum in the 480nm to 700nm wavelength band, a first unit having a continuous emission spectrum in the 380nm to 480nm wavelength band, and a second unit having a continuous emission spectrum in the 700nm to 780nm wavelength band. In this way, the first unit, whose emission spectrum wavelength coverage is in the violet band, and the second unit, whose emission spectrum wavelength coverage is in the red band, are combined with the white light unit to improve the chromatographic richness of the multi-unit combined light source, thereby facilitating a natural, realistic, and comfortable visual experience for the human eye.

Description

Technical Field

[0001] This utility model relates to the field of light sources, and in particular to a multi-unit combined light source. Background Technology

[0002] With the continuous development of LED lighting technology, people are not only meeting traditional lighting needs, but also placing higher demands on the quality and comfort of lighting light. In particular, in recent years, as people have realized that light is closely related to eye health and biological rhythms, people's requirements for healthy lighting are also constantly increasing. Therefore, researchers are constantly pursuing higher quality lighting effects, such as the concept of full-spectrum lighting based on the requirements for the comfort and color rendering quality of lighting sources.

[0003] However, for the LED chips used in current lighting sources, due to their generally narrow emission wavelengths and distinct emission peak wavelengths, even using multiple LED chips combined with appropriately matched phosphors, it is difficult to achieve complete convergence in intensity between the emission spectrum of the light source and the solar spectrum within the visible light wavelength range of 380nm to 780nm. Therefore, current lighting sources, even those designed based on the concept of full-spectrum lighting, only attempt to achieve convergence between the emission spectrum and the solar spectrum within the wavelength range of 430nm to 680nm by combining multiple LED chips with different emission peak wavelengths and appropriately proportioned phosphors.

[0004] While light sources designed based on the aforementioned full-spectrum lighting concept can achieve good color rendering quality due to their emission spectrum, which is similar to that of sunlight in the wavelength range of 430nm to 680nm, their spectral richness cannot match that of sunlight because of the lack of spectra in the wavelength ranges below 430nm and above 680nm. Therefore, they still cannot provide the human eye with a natural, realistic, and comfortable visual experience. This is because, while those skilled in the art specializing in light source design and manufacturing are familiar with the three primary color display mechanism, they find it difficult to understand the human eye's color perception mechanism across different fields.

[0005] Specifically, the human retina contains two types of photoreceptor cells: rod cells and cone cells. Rod cells function in low light but lack color recognition capabilities; therefore, people can see objects in dim light but cannot distinguish colors. Cone cells, on the other hand, function in bright light. Our ability to see color is thanks to these cone cells, which absorb light waves of different wavelengths and transmit the information to the brain. The brain then processes this information to produce what we call color perception. Normally, the human retina contains three types of cone cells that can sense red, green, and blue light respectively. This is why red, green, and blue are also called the three primary colors, corresponding to L-cone cells, M-cone cells, and S-cone cells, respectively. In other words, while the color of light is related to wavelength, for the human eye, color perception stems from different combinations of responses of the three types of cone cells to light. For example, yellow light simultaneously stimulates both L and M cone cells, triggering the brain's perception of yellow. Therefore, even a mixture of red and green light, without a change in wavelength, can be perceived as yellow by the brain. In addition, there are cases where the stimulation patterns of the three types of cone cells are different but may be perceived as the same color by the brain. For example, the stimulation patterns of monochromatic violet light and red-blue mixed light (perceived as violet by the human eye) on the three types of cone cells are compared in the table below:

[0006] Light source type S-cone stimulation level Degree of stimulation of the M cone The degree of stimulation of the L-cone Monochrome purple light high Extremely low Low Red and blue mixed light high Low high

[0007] Regarding the perception of colors formed by mixed light, the color spectrum entering the eye is not the same as the natural color spectrum of the object being observed. Furthermore, the peak wavelengths of cone cells vary among individuals; some people even have four types of cone cells. This leads to differences in the perception of colors formed by mixed light, especially when the stimulation patterns of the three types of cone cells differ between the mixed light and its monochromatic counterpart. Additionally, the varying reflectivity of objects to different colors in the mixed light also affects the human eye's color perception. Therefore, while current light sources designed based on the aforementioned full-spectrum illumination concept possess a emission spectrum similar to sunlight in the 430nm to 680nm wavelength range, achieving good color rendering quality, their chromatographic richness is far inferior to sunlight, preventing the color spectrum entering the eye from corresponding to the natural color spectrum of the object being observed. Consequently, they fail to provide the human eye with a natural, realistic, and comfortable visual experience. Utility Model Content

[0008] One objective of this invention is to provide a multi-unit combined light source, wherein the multi-unit combined light source can increase the richness of emission peak wavelengths in the visible light band and improve the visual perception of the human eye.

[0009] Another objective of this invention is to provide a multi-unit combined light source, wherein the multi-unit combined light source includes a white light unit with a continuous emission spectrum in the 480nm to 700nm wavelength band, a first unit with a continuous emission spectrum in the 380nm to 480nm wavelength band, and a second unit with a continuous emission spectrum in the 700nm to 780nm wavelength band. In this way, the segmented design of the visible light band based on multiple light-emitting units in the 380nm to 780nm visible light band is easily achieved, which is conducive to ensuring the chromatographic richness of the multi-unit combined light source. This is beneficial to the human eye's color perception mechanism, so that the chromatogram entering the eye can be similar to the chromatogram of the object being viewed, thereby improving the human eye's ability to compare and filter the differences of the object being viewed, and allowing the human eye to obtain a natural, realistic and comfortable visual experience.

[0010] Another objective of this invention is to provide a multi-unit combined light source, wherein the multi-unit combined light source is based on the combined light emission of multiple light sources to achieve full-spectrum illumination in the visible light band from 380nm to 780nm, and to provide the human eye with a natural, realistic and comfortable visual experience.

[0011] Another objective of this invention is to provide a multi-unit combined light source, wherein the multi-unit combined light source is based on the first unit and the second unit to complete the violet and red light bands of the corresponding emission spectrum, thereby ensuring the chromatographic richness of the multi-unit combined light source.

[0012] Another objective of this invention is to provide a multi-unit combined light source, wherein the highest spectral intensity of the white light unit is in the wavelength range of 480nm to 700nm, the highest spectral intensity of the first unit is in the wavelength range of 380nm to 480nm, and the highest spectral intensity of the second unit is in the wavelength range of 700nm to 780nm, so as to ensure the intensity of each unit in the corresponding wavelength range.

[0013] Another objective of this invention is to provide a multi-unit combined light source, wherein the multi-unit combined light source has at least two light emission modes based on the adjustment / selection requirements of color temperature, wherein the power ratio of the first unit, the second unit and the white light unit is adjustable, so as to achieve linear adjustment of color temperature and improve the visual experience of the human eye by coordinating the power ratio settings of the first unit, the second unit and the white light unit under the corresponding color temperature adjustment / selection.

[0014] Another objective of this invention is to provide a multi-unit combined light source, wherein the normalized relative spectral intensity of the white light unit in the 480nm to 700nm band is greater than 0.2, the normalized relative spectral intensity of the first unit in the 380nm to 480nm band is greater than 0.25, and the normalized relative spectral intensity of the second unit in the 700nm to 780nm band is greater than 0.5, thereby ensuring that each unit has a suitable intensity distribution in the corresponding band.

[0015] Another objective of this invention is to provide a multi-unit combined light source, wherein the multi-unit combined light source has at least two different types of white light sources, wherein the corresponding emission spectra of the different types of white light sources are different, that is, the emission spectra of the two different types of white light sources have different intensity distributions to form different color temperatures, thereby forming an adjustment / selection of color temperature based on the individual or combined emission of the different types of white light sources.

[0016] Another objective of this invention is to provide a multi-unit combined light source, wherein different types of white light sources are emitted individually or in combination, and the power ratio of the first unit, the second unit, and the white light source is set to improve the color temperature adjustment effect of the multi-unit combined light source based on the richness of the color spectrum.

[0017] According to one aspect of the present invention, a multi-unit combined light source is provided, wherein the multi-unit combined light source includes a white light unit having a continuous emission spectrum in the 480nm to 700nm wavelength range, a first unit having a continuous emission spectrum in the 380nm to 480nm wavelength range, and a second unit having a continuous emission spectrum in the 700nm to 780nm wavelength range. The highest spectral intensity of the white light unit is within the 480nm to 700nm wavelength range and the normalized relative spectral intensity of the white light unit in this wavelength range is greater than 0.2. The highest spectral intensity of the first unit is within the 380nm to 480nm wavelength range and the normalized relative spectral intensity of the first unit in this wavelength range is greater than 0.25. The highest spectral intensity of the second unit is within the 700nm to 780nm wavelength range and the normalized relative spectral intensity of the second unit in this wavelength range is greater than 0.5.

[0018] In one embodiment, the power ratio of the first unit, the second unit, and the white light unit is adjustable.

[0019] In one embodiment, the power of the first unit, the second unit, and the white light unit is individually adjustable to form a power ratio adjustment of the first unit and / or the second unit based on the power adjustment of the first unit and / or the second unit and / or the white light unit.

[0020] In one embodiment, the multi-unit combined light source has a power adjustment parameter arranged over time, wherein the power of the first unit, the second unit, and the white light unit is dynamically adjusted over time according to the power adjustment parameter.

[0021] In one embodiment, the multi-unit combined light source has at least two different types of white light sources to adjust / select the color temperature based on the individual or combined emission of the different types of white light sources.

[0022] In one embodiment, the multi-unit combined light source has a light emission mode in which the region enclosed by the lines connecting the color coordinates of at least one of the white light units, the color coordinates of the first unit, and the color coordinates of the second unit covers the curve segment of the solar spectrum on the Planck trajectory; the multi-unit combined light source has another light emission mode in which the region enclosed by the lines connecting the color coordinates of at least two of the white light units, the color coordinates of the first unit, and / or the color coordinates of the second light source covers the curve segment of the solar spectrum on the Planck trajectory; and the multi-unit combined light source has yet another light emission mode in which the color coordinates of the two white light units are located on the Planck trajectory.

[0023] In one embodiment, the white light unit encapsulates at least one LED chip and at least three types of phosphors with emission peak wavelengths greater than or equal to 480 nm and less than 700 nm, wherein the LED chip of the white light unit has at least two emission peak wavelengths in the band range of greater than or equal to 480 nm and less than 700 nm.

[0024] In one embodiment, the first unit encapsulates at least one LED chip, the LED chip of the first unit having at least two emission peak wavelengths in a band range greater than or equal to 380 nm and less than 480 nm.

[0025] In one embodiment, the second unit encapsulates at least one LED chip, the LED chip of the second unit having at least two emission peak wavelengths in a band range of greater than or equal to 700 nm and less than or equal to 780 nm.

[0026] In one embodiment, the LED chip encapsulated by the white light unit, the first unit, and the second unit is a single-peak chip with one and only one emission peak wavelength.

[0027] In one embodiment, the LED chips in the same unit are arranged in series.

[0028] In one embodiment, the white light unit encapsulates at least one LED chip with a corresponding emission spectrum having at least two emission peak wavelengths.

[0029] The further objectives and advantages of this invention will become fully apparent from the following description and accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the emission spectrum of a white light unit of a multi-unit combined light source according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the emission spectrum of another type of white light unit of the multi-unit combined light source according to the above embodiments of the present invention.

[0032] Figure 3 This is a schematic diagram of the emission spectrum of a first unit of the multi-unit combined light source according to the above embodiments of the present invention.

[0033] Figure 4 This is a schematic diagram of the emission spectrum of a second unit of the multi-unit combined light source according to the above embodiment of the present invention. Detailed Implementation

[0034] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0035] Those skilled in the art should understand that, in the disclosure of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0036] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0037] This invention provides a multi-unit combined light source. Based on the differences in stimulation patterns of the three types of cone cells in the human eye's color perception mechanism between monochromatic light and mixed light that can be identified as that color, the multi-unit combined light source sets corresponding light-emitting units in the violet and red light bands. This ensures the richness of the emission peak wavelength of the multi-unit combined light source within the visible light band of 380nm-780nm, correspondingly ensuring the richness of the color spectrum of the multi-unit combined light source. Therefore, it is beneficial for the human eye's color perception mechanism to make the color spectrum entering the eye more similar to the color spectrum of the object being observed, thereby improving the human eye's ability to compare and filter differences in the observed object and providing the human eye with a natural, realistic, and comfortable visual experience.

[0038] Specifically, please refer to the accompanying drawings in the specification of this utility model. Figures 1 to 4 The multi-unit combined light source includes white light units with a continuous emission spectrum in the 480nm to 700nm wavelength range (corresponding to...). Figure 1 and Figure 2 The first unit, which has a continuous emission spectrum in the 380nm to 480nm wavelength range (corresponding to...) Figure 3 ), and a second unit with a continuous emission spectrum in the 700nm to 780nm band (corresponding to Figure 4 In this way, the first unit, whose emission spectrum covers the violet band, and the second unit, whose emission spectrum covers the red band, are combined with the white light unit to improve the chromatographic richness of the multi-unit combined light source. This is beneficial in the human eye's color perception mechanism, so that the chromatogram of the color entering the eye can be similar to the chromatogram of the object being observed, thereby improving the human eye's ability to compare and filter the differences of the object being observed, and allowing the human eye to obtain a natural, realistic and comfortable visual experience.

[0039] It is worth mentioning that the corresponding emission spectrum formed by the simultaneous emission of the white light unit, the first unit, and the second unit is the emission spectrum of the multi-unit combined light source. That is, the multi-unit combined light source achieves a segmented design in the visible light band from 380nm to 780nm based on multiple light-emitting units. In other words, one light-emitting unit forms a spectrum of a segment of the 380nm to 780nm band, and the combined emission of multiple light-emitting units forms a complete spectrum, which easily achieves a full-spectrum effect in the visible light band from 380nm to 780nm.

[0040] In particular, the multi-unit combined light source is based on the combined light emission of multiple light sources to achieve full-spectrum illumination in the visible light band from 380nm to 780nm, and the corresponding spectral coverage involves the violet light band and the red light band, which improves the richness of the color spectrum and helps the human eye obtain a natural, realistic and comfortable visual experience.

[0041] It is worth mentioning that the multi-unit combined light source is based on the first unit and the second unit to complete the spectrum of the white light unit in the violet and red light bands, forming a continuous spectrum covering the visible light band from 380nm to 780nm, and ensuring the chromatographic richness of the multi-unit combined light source.

[0042] Specifically, in this invention, the multi-unit combined light source has at least two different types of white light units, corresponding to Figure 1 The emission spectrum of one type of white light unit, Figure 2 The emission spectrum of another type of white light unit, that is, the emission spectra of the corresponding white light units of different types are different, that is, the emission spectra of two white light units of different types have different intensity distributions to form different color temperatures, thereby forming the adjustment / selection of color temperature based on the individual or combined emission of the white light units of different types.

[0043] It is worth mentioning that the multi-unit combined light source has at least two different types of white light units, thus having at least two light emission modes based on the adjustment / selection requirements of color temperature. The power ratio of the first unit, the second unit, and the white light unit is adjustable to achieve linear adjustment of color temperature by coordinating the power ratio of the first unit and / or the second unit and / or the white light unit under the corresponding color temperature adjustment / selection, thereby improving the visual experience of the human eye.

[0044] In other words, when different types of white light sources are emitted individually or in combination, the power ratio of the first unit and / or the second unit and / or the white light unit is set to enhance the color temperature adjustment effect of the multi-unit combined light source based on the richness of the color spectrum.

[0045] Specifically, based on the adjustment of the power ratio of the first unit and / or the second unit and / or the white light unit, the multi-unit combined light-emitting unit can simulate the illumination effect of sunlight at different times. The multi-unit combined light-emitting unit has a power adjustment parameter arranged according to time, that is, the power adjustment parameter is established according to the correspondence between time and the power of the first unit, the second unit, and the white light unit. The power of the first unit, the second unit, and the white light unit is dynamically adjusted according to time according to the power adjustment parameter, so as to realize the dynamic change of the illumination effect of the multi-unit combined light-emitting source according to time, and realize the dynamic simulation of sunlight at different times.

[0046] It is worth mentioning that the highest spectral intensity of the white light unit is in the wavelength range of 480nm to 700nm, the highest spectral intensity of the first unit is in the wavelength range of 380nm to 480nm, and the highest spectral intensity of the second unit is in the wavelength range of 700nm to 780nm, so as to ensure the intensity of each unit in the corresponding wavelength range.

[0047] Specifically, the normalized relative spectral intensity of the white light unit in the 480nm to 700nm band is greater than 0.2, the normalized relative spectral intensity of the first unit in the 380nm to 480nm band is greater than 0.25, and the normalized relative spectral intensity of the second unit in the 700nm to 780nm band is greater than 0.5, thereby ensuring that each unit has a suitable intensity distribution in the corresponding band.

[0048] It is worth mentioning that, based on the configuration of the first unit and the second unit, the multi-unit combined light source achieves linear adjustment of the corresponding color temperature along the Planck trajectory. The multi-unit combined light source has a light emission mode. In the light emission mode, the area enclosed by the line connecting the color coordinates of at least one of the white light units, the color coordinates of the first unit, and the color coordinates of the second unit covers the curve segment of the solar spectrum on the Planck trajectory. According to the color mixing principle of color coordinates, the light color corresponding to any color coordinate within the area enclosed by the color coordinate points is obtained through the weighted calculation of each unit, thereby achieving full coverage of the color coordinate points of the corresponding solar spectrum curve segment on the Planck trajectory.

[0049] Furthermore, the multi-unit combined light source has another light emission mode. In the other light emission mode, the area enclosed by the lines connecting the color coordinates of at least two of the white light units, the color coordinates of the first unit, and / or the color coordinates of the second light emission unit covers the curve segment of the solar spectrum on the Planck trajectory. The light color corresponding to any color coordinate within the area enclosed by the color coordinate points is obtained through weighted calculation of each unit, thereby achieving full coverage of the color coordinate points of the corresponding solar spectrum curve segment on the Planck trajectory.

[0050] Furthermore, the multi-unit combined light source has another light emission mode, in which the color coordinates of the two white light units are located on the Planck locus.

[0051] Furthermore, the white light unit encapsulates at least one LED chip and at least three types of phosphors with emission peak wavelengths greater than or equal to 480 nm and less than 700 nm. The LED chip of the white light unit has at least two emission peak wavelengths in the band range of greater than or equal to 480 nm and less than 700 nm. Based on the number of LED chips and phosphors using the corresponding LED chips as excitation light sources and the emission peak wavelengths, the design ensures the richness of emission peak wavelengths and the continuity of the spectrum of the white light unit in the 480 nm to 700 nm band.

[0052] Furthermore, the first unit is packaged with at least one LED chip, and the LED chip of the first unit has at least two emission peak wavelengths in a band range of greater than or equal to 380 nm and less than 480 nm, so as to ensure the formation of a emission spectrum corresponding to the violet light band.

[0053] Furthermore, the second unit is packaged with at least one LED chip, and the LED chip of the second unit has at least two emission peak wavelengths in a band range of greater than or equal to 700 nm and less than or equal to 780 nm, so as to ensure that the operation corresponds to the emission spectrum involving the red light band.

[0054] It is worth mentioning that the LED chips packaged in the white light unit, the first unit, and the second unit can be single-peak chips with one and only one peak in the corresponding spectrum, or dual-quantum-well chips or multi-quantum-well chips with at least two peaks in the corresponding spectrum. Each unit can package a chip that is one of the following: single-peak chip, dual-quantum-well chip, or multi-quantum-well chip, or a combination of at least two of these types. Preferably, the LED chips belonging to the same unit are connected in series, which helps to ensure the power consistency of each LED chip.

[0055] For example, in one embodiment of this utility model, the LED chips packaged in the white light unit, the first unit, and the second unit are single-peak chips with one and only one peak. The white light unit has at least two LED chips to form at least two emission peak wavelengths in a wavelength range greater than or equal to 480 nm and less than 700 nm. The first unit has at least two LED chips to have at least two emission peak wavelengths in a wavelength range greater than or equal to 380 nm and less than 480 nm. The second unit has at least two LED chips to have at least two emission peak wavelengths in a wavelength range greater than or equal to 700 nm and less than or equal to 780 nm. The LED chips in the same unit are connected in series.

[0056] For example, in one embodiment of the present invention, the white light unit is packaged with at least one LED chip having at least two peaks in the corresponding emission spectrum. The white light unit has at least one LED chip and the LED chip is a dual quantum well chip or a multi-quantum well chip, so that at least two emission peak wavelengths can be formed in the band range of greater than or equal to 480 nm and less than 700 nm.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. Multi-cell combined light emitting light source, characterized in that, The multi-unit combined light source includes a white light unit having a continuous emission spectrum in the 480nm to 700nm wavelength range, a first unit having a continuous emission spectrum in the 380nm to 480nm wavelength range, and a second unit having a continuous emission spectrum in the 700nm to 780nm wavelength range. The highest spectral intensity of the white light unit is in the 480nm to 700nm wavelength range and the normalized relative spectral intensity of the white light unit in this wavelength range is greater than 0.

2. The highest spectral intensity of the first unit is in the 380nm to 480nm wavelength range and the normalized relative spectral intensity of the first unit in this wavelength range is greater than 0.

25. The highest spectral intensity of the second unit is in the 700nm to 780nm wavelength range and the normalized relative spectral intensity of the second unit in this wavelength range is greater than 0.

5.

2. The multi-unit combined light source according to claim 1, wherein the power ratio of the first unit, the second unit, and the white light unit is adjustable.

3. The multi-unit combined light source according to claim 2, wherein the power of the first unit, the second unit and the white light unit is individually adjustable to form a power ratio adjustment of the first unit and / or the second unit based on the power adjustment of the first unit and / or the second unit and / or the white light unit.

4. The multi-unit combined light source according to claim 3, wherein the multi-unit combined light source has a power adjustment parameter arranged according to time, wherein the power of the first unit, the second unit and the white light unit is dynamically adjusted according to the power adjustment parameter over time.

5. The multi-unit combined light source according to claim 2, wherein the multi-unit combined light source has at least two different types of white light sources to adjust / select the color temperature based on the individual or combined emission of the different types of white light sources.

6. The multi-unit combined light source according to claim 5, wherein the multi-unit combined light source has a light emission mode, wherein in the light emission mode the region enclosed by the lines connecting the color coordinates of at least one of the white light units, the color coordinates of the first unit, and the color coordinates of the second unit covers the curve segment of the solar spectrum on the Planck trajectory; wherein the multi-unit combined light source has another light emission mode, wherein in the other light emission mode the region enclosed by the lines connecting the color coordinates of at least two of the white light units, the color coordinates of the first unit, and / or the color coordinates of the second light source covers the curve segment of the solar spectrum on the Planck trajectory; wherein the multi-unit combined light source has yet another light emission mode, wherein in the yet another light emission mode the color coordinates of the two white light units are located on the Planck trajectory.

7. The multi-unit combined light source according to claim 6, wherein the white light unit encapsulates at least one LED chip and at least three types of phosphors with emission peak wavelengths greater than or equal to 480 nm and less than 700 nm, and the LED chip of the white light unit has at least two emission peak wavelengths in the band range of greater than or equal to 480 nm and less than 700 nm.

8. The multi-unit combined light source according to claim 7, wherein the first unit is packaged with at least one LED chip, and the LED chip of the first unit has at least two emission peak wavelengths in a band range greater than or equal to 380 nm and less than 480 nm.

9. The multi-unit combined light source according to claim 8, wherein the second unit is packaged with at least one LED chip, and the LED chip of the second unit has at least two emission peak wavelengths in a band range of greater than or equal to 700 nm and less than or equal to 780 nm.

10. The multi-unit combined light source according to claim 9, wherein the LED chip packaged by the white light unit, the first unit, and the second unit is a single-peak chip with one and only one emission peak wavelength.

11. The multi-unit combined light source according to claim 10, wherein the LED chips in the same unit are connected in series.

12. The multi-unit combined light source according to claim 11, wherein the white light unit is encapsulated with at least one LED chip having at least two emission peak wavelengths corresponding to the emission spectrum.

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