Wavelength conversion assembly and lighting equipment

Abstract

The utility model discloses a wavelength conversion assembly and lighting equipment. The wavelength conversion assembly comprises a light-transmitting unit, a metal oxide transition layer and a wavelength conversion layer. Wherein the light-transmitting unit comprises a light-in surface and a light-out surface which are deviated from each other; the excitation light can be incident to the light-transmitting unit from the light incident surface. The metal oxide transition layer is arranged on the light-emitting surface of the light-transmitting unit. The wavelength conversion layer is arranged on the side, away from the light transmitting unit, of the metal oxide transition layer and used for converting the exciting light into excited light. Exciting light can sequentially transmit the light-transmitting unit and the metal oxide transition layer and then enter the wavelength conversion layer, and then the exciting light is converted into excited light under the action of the wavelength conversion layer. Therefore, the wavelength conversion assembly adopts a transmission type structure, and compared with a reflection type wavelength conversion assembly, the light path structure can be simplified, so that the overall structure of the lighting equipment provided with the wavelength conversion assembly is more compact and reasonable, and miniaturization design of the lighting equipment is facilitated.

Description

Technical Field

[0001] The present application relates to the field of laser lighting technology, and more specifically, to a wavelength conversion component and a lighting device. Background Art

[0002] In the existing field of laser lighting technology, a lighting method of laser excitation of fluorescence is generally adopted. For example, blue laser is used to excite yellow fluorescence, which can be mixed to form white light.

[0003] In related technologies, laser lighting devices typically employ a reflective illumination system, meaning the wavelength conversion device within the device is a reflective structure. However, a reflective illumination system requires additional optical components (e.g., beam splitters, reflectors, lenses, etc.) to operate in conjunction with the wavelength conversion device. This increases the size of the illumination system, making it difficult to achieve a miniaturized design for the laser lighting device. Utility Model Content

[0004] Embodiments of the present application provide a wavelength conversion component and a lighting device.

[0005] According to a first aspect of the present application, embodiments of the present application provide a wavelength conversion component comprising a light-transmitting unit, a metal oxide transition layer, and a wavelength conversion layer. The light-transmitting unit comprises a light-entry surface and a light-exiting surface, each of which is opposed to the other. Excitation light can enter the light-transmitting unit from the light-entry surface. The metal oxide transition layer is disposed on the light-exiting surface of the light-transmitting unit. The wavelength conversion layer is disposed on a side of the metal oxide transition layer facing away from the light-transmitting unit and is configured to convert the excitation light into stimulated light.

[0006] In some possible embodiments, the thickness of the metal oxide transition layer is greater than or equal to 5 nm and less than or equal to 80 nm.

[0007] In some possible embodiments, the metal oxide transition layer is an aluminum oxide film, and the aluminum oxide film covers the light-emitting surface of the light-transmitting unit.

[0008] In some possible embodiments, the wavelength conversion layer is a fluorescent glass film, and the fluorescent glass film covers the side of the metal oxide transition layer away from the light-transmitting unit.

[0009] In some possible embodiments, the wavelength conversion layer is doped with fluorescent particles, and the fluorescent particles include at least two of red fluorescent particles, yellow fluorescent particles, and green fluorescent particles.

[0010] In some possible embodiments, the thickness of the wavelength conversion layer is greater than or equal to 50 μm and less than or equal to 80 μm.

[0011] In some possible embodiments, the light-transmitting unit includes a light-transmitting layer and a dichroic film, and the dichroic film is disposed between the light-transmitting layer and the metal oxide transition layer; the dichroic film is used to transmit the excitation light and reflect the converted light.

[0012] In some possible embodiments, the excitation light is a blue laser, and the light-transmitting layer is a transparent sapphire layer.

[0013] According to a second aspect of the present application, embodiments of the present application provide an illumination device comprising a light source and the aforementioned wavelength conversion component. The illumination device is configured to generate excitation light, and the wavelength conversion component is disposed in the optical path of the excitation light, so that the excitation light passes through the wavelength conversion component to form illumination light.

[0014] In some possible embodiments, the color rendering index of the lighting light is greater than or equal to 92; or / and the lumen efficiency of the lighting device is greater than or equal to 40 lm / W.

[0015] The present application provides a wavelength conversion component and a lighting device, wherein the wavelength conversion component includes a light-transmitting unit, a metal oxide transition layer, and a wavelength conversion layer, wherein the metal oxide transition layer is connected between the light-transmitting unit and the wavelength conversion layer to securely connect the light-transmitting unit and the wavelength conversion layer.

[0016] Because the light-entering surface of the light-transmitting unit is positioned within the optical path of the excitation light, the excitation light sequentially transmits through the light-transmitting unit and the metal oxide transition layer before entering the wavelength conversion layer, where it is subsequently converted into converted light. Therefore, the wavelength conversion assembly in this embodiment employs a transmissive structure, simplifying the optical path compared to reflective wavelength conversion assemblies. This makes the overall structure of the lighting device equipped with this wavelength conversion assembly more compact and rational, facilitating miniaturization of the lighting device.

[0017] In addition, since a metal oxide transition layer is provided between the light-transmitting unit and the wavelength conversion layer, the metal oxide transition layer can play a role of transition bonding to improve the reliability of the connection between the light-transmitting unit and the wavelength conversion layer, thereby realizing the integration and tight connection of the wavelength conversion component. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural diagram of the lighting device provided in an embodiment of the present application.

[0020] Figure 2 yes Figure 1 A schematic diagram of the structure of a wavelength conversion component in a lighting device is shown.

[0021] Figure 3 yes Figure 1 Another structural schematic diagram of a wavelength conversion component in a lighting device is shown. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] The present invention provides a wavelength conversion component 100 and a lighting device 200 equipped with the wavelength conversion component 100. The lighting device 200 is a device for generating illumination light. For example, the lighting device 200 may be a laser light, a stage light, a car light, a searchlight, or the like.

[0024] Specifically, the lighting device 200 may include a light source 210 and a wavelength conversion component 100, wherein the light source 210 is used to generate excitation light L. The excitation light L serves as the excitation light of the wavelength conversion component 100. For example, the excitation light L may be blue light, and the wavelength of the blue light may be 450nm, 455nm, etc. Of course, in some other possible embodiments, the excitation light L may also be violet light, deep blue light, etc. Specifically, the light source 210 may be a laser generator, such as a gas laser generator, a solid-state laser generator, a semiconductor laser generator, etc. The number of laser generators may be multiple to achieve high-power lighting of the lighting device 200.

[0025] In some other possible embodiments, the light source 210 may also be an LED generator, for example, a blue LED light. In this case, the excitation light L may be the blue LED light.

[0026] The wavelength conversion component 100 is suitable for being arranged in the optical path where the excitation light L is located, and is used to convert the excitation light L into the converted light F. Specifically, the excitation light L forms an illumination light after passing through the wavelength conversion component 100. It is not difficult to understand here that in the process of the excitation light L passing through the wavelength conversion component 100, part of the excitation light L may not be converted into the converted light F. This part of the unconverted light will be combined with the converted light F to form an illumination light emitted to the outside. For example, when a blue laser excites yellow fluorescence, part of the blue laser will not be converted into yellow fluorescence. This part of the blue laser and the excited yellow fluorescence will be combined to form white light (i.e., illumination light).

[0027] In this embodiment, the inventors of this application conducted spectral testing on the lighting device 100 and found that the color rendering index of the lighting light is greater than or equal to 92. For example, the color rendering index of the lighting light can be 92, 94, 96, 98, and so on. The lumen efficiency of the lighting device 100 is greater than or equal to 40 lm / W. For example, the lumen efficiency of the lighting device 100 can be 41.5 lm / W, 42.3 lm / W, 44.2 lm / W, 45.5 lm / W, and so on. Therefore, the lighting device 100 in this embodiment has the advantages of a high color rendering index and high brightness, which can enhance the market competitiveness of the lighting device 100.

[0028] See also Figure 2 The wavelength conversion component 100 may include a light-transmitting unit 10, a metal oxide transition layer 30, and a wavelength conversion layer 50. The light-transmitting unit 10 may include a light incident surface 102 and a light emitting surface 104 that are opposite to each other. The excitation light L may be incident on the light-transmitting unit 10 from the light incident surface 102. The metal oxide transition layer 30 is disposed on the light emitting surface 104 of the light-transmitting unit 10. The wavelength conversion layer 50 is disposed on a side of the metal oxide transition layer 30 that is opposite to the light-transmitting unit 10, and is used to convert the excitation light L into the converted light F.

[0029] Because the light incident surface 102 of the light-transmitting unit 10 is disposed on the optical path of the excitation light L, the excitation light L can sequentially transmit the light-transmitting unit 10 and the metal oxide transition layer 30 before entering the wavelength conversion layer 50 and being converted into the converted light F by the wavelength conversion layer 50. Therefore, the wavelength conversion component 100 in this embodiment adopts a transmissive structure. Compared to a reflective wavelength conversion component 100, this simplifies the optical path structure, making the overall structure of the lighting device 200 equipped with the wavelength conversion component 100 more compact and reasonable, thereby facilitating a miniaturized design of the lighting device 200.

[0030] In addition, since a metal oxide transition layer 30 is provided between the light-transmitting unit 10 and the wavelength conversion layer 50, the metal oxide transition layer 30 can play a role of transition bonding to improve the reliability of the connection between the light-transmitting unit 10 and the wavelength conversion layer 50, thereby realizing the integration and tight connection of the wavelength conversion component 100.

[0031] The specific implementation of the wavelength conversion component 100 is introduced below.

[0032] In this embodiment, the light-transmitting unit 10 is used to fix and support the metal oxide transition layer 30 and the wavelength conversion layer 50 , and is also used to transmit the excitation light L so that the excitation light L can smoothly pass through the light-transmitting unit 10 and enter the wavelength conversion layer 50 .

[0033] See also Figure 3 The light-transmitting unit 10 may include a light-transmitting layer 120 having a light-incident surface 102. The excitation light L enters the light-transmitting layer 120 via the light-incident surface 102. Specifically, the light-transmitting layer 120 may be made of a transparent material (e.g., glass, sapphire). The light-emitting surface 104 is opposite to the light-incident surface 102 and is used to connect to the wavelength conversion layer 50.

[0034] In some possible embodiments, the excitation light L may be a blue laser, and the light-transmitting layer 120 may be a transparent sapphire layer. Therefore, the light-transmitting layer 120 in this embodiment has high hardness and transparency, which can improve the wear resistance of the wavelength conversion component 100.

[0035] Specifically, the light-transmitting layer 120 can be a transparent sapphire disc, and its diameter can be greater than or equal to 3 mm and less than or equal to 7 mm. For example, the diameter of the transparent sapphire disc can be 3 mm, 5 mm, 7 mm, and so on. The light-transmitting layer 120 can be a transparent sapphire square, and its side length can be greater than or equal to 2 mm and less than or equal to 4 mm. For example, the side length of the transparent sapphire square can be 2 mm, 3 mm, 4 mm, and so on. Therefore, the light-transmitting layer 120 in this embodiment uses a small-sized disc or square, which is conducive to the small-sized design of the wavelength conversion component 100.

[0036] In this embodiment, the light-transmitting unit 10 may further include a dichroic film 140. The dichroic film 140 is disposed between the light-transmitting layer 120 and the metal oxide transition layer 30. The dichroic film 140 is configured to transmit the excitation light L and reflect the converted light F. On one hand, the dichroic film 140 is configured to transmit the excitation light L to ensure that the excitation light L can smoothly pass through the dichroic film 140 and then be incident on the wavelength conversion layer 50. On the other hand, since the converted light F (i.e., fluorescence) is a Lambertian light source, that is, a portion of the converted light F will be emitted toward one side of the light-transmitting layer 120. Therefore, the dichroic film 140 in this embodiment is also configured to reflect this portion of the converted light F to improve the energy utilization efficiency of the converted light F.

[0037] Specifically, the dichroic film 140 can be a blue-transmitting, yellow-reflecting film. The blue-transmitting, yellow-reflecting film is used to transmit light with a wavelength between 440 nm and 460 nm, and the transmittance can be greater than or equal to 90%. For example, the transmittance can be 90%, 92%, 95%, 98%, etc. The blue-transmitting, yellow-reflecting film is also used to reflect light with a wavelength between 480 nm and 780 nm, and the reflectance can be greater than or equal to 90%. For example, the reflectance can be 90%, 92%, 95%, 98%, etc.

[0038] It should be noted that in some possible embodiments, the light-transmitting unit 10 may not be provided with the dichroic film 140. In this case, the light-emitting surface 104 is the surface of the light-transmitting layer 120 that is opposite to the light-incident surface 102. In other possible embodiments, the light-transmitting unit 10 includes the light-transmitting layer 120 and the dichroic film 140. In this case, the light-emitting surface 104 is the surface formed by the dichroic film 140 covering the side of the light-transmitting layer 120 that is opposite to the light-incident surface 102.

[0039] In this embodiment, the metal oxide transition layer 30 is connected between the light-transmitting unit 10 and the wavelength conversion layer 50 to improve the adhesion between the wavelength conversion layer 50 and the light-transmitting unit 10, thereby firmly connecting the light-transmitting unit 10 and the wavelength conversion layer 50. It should be noted that in one embodiment of the present application, the metal oxide transition layer 30 has a transmittance of greater than or equal to 60% for the incident excitation light L. In other embodiments of the present application, the metal oxide transition layer 30 has a transmittance of greater than or equal to 70% for the incident excitation light L. Of course, in another embodiment of the present application, the metal oxide transition layer 30 has a transmittance of greater than or equal to 80% for the incident excitation light L.

[0040] Specifically, the metal oxide transition layer 30 may be an aluminum oxide film, which covers the light-emitting surface 104 of the light-transmitting unit 10. Since the aluminum oxide film is a transparent film, it has a high transmittance (e.g., a transmittance of 80%, 85%, 90%, 95%, etc.) to the incident excitation light L, and is therefore an ideal metal oxide transition layer 30 in some embodiments of the present application. In other possible embodiments, the metal oxide transition layer 30 may also be a titanium oxide film, which also has a high transmittance to the incident excitation light L. This embodiment is not specifically limited to this.

[0041] In some possible embodiments, the thickness of the metal oxide transition layer 30 is greater than or equal to 5 nm and less than or equal to 80 nm. For example, the thickness of the metal oxide transition layer 30 can be 5 nm, 10 nm, 20 nm, 50 nm, 80 nm, and so on. Therefore, the extremely thin thickness of the metal oxide transition layer 30 minimizes light loss when the excitation light L passes through the metal oxide transition layer 30, thereby ensuring the light power incident on the wavelength conversion layer 50 and the excitation efficiency of the stimulated light F.

[0042] In this embodiment, the wavelength conversion layer 50 is disposed on the side of the metal oxide transition layer 30 facing away from the light-transmitting unit 10 and is used to convert the excitation light L into the converted light F. The converted light F can be a single-color fluorescent light or a mixed fluorescent light of multiple colors. Specifically, the excitation light L can be a blue laser. The wavelength conversion layer 50 is doped with fluorescent particles 520, which can include at least two of red, yellow, and green fluorescent particles.

[0043] In some possible embodiments, the fluorescent particles 520 may include red fluorescent particles, yellow fluorescent particles, and green fluorescent particles. In this case, the stimulated light F may be a mixture of red, yellow, and green fluorescent light. Therefore, when the wavelength conversion component 100 is configured in the lighting device 200, the generated illumination light may simultaneously mix blue laser light, red fluorescent light, yellow fluorescent light, and green fluorescent light to achieve a higher color rendering index, which can meet the high color rendering index requirements of some lighting or photography equipment. It should be noted that when the fluorescent particles 520 include red, yellow, and green fluorescent particles at the same time, the color rendering index of the illumination light can be greater than or equal to 92, thereby achieving a lighting effect with a high color rendering index.

[0044] Specifically, the red fluorescent particles may be nitride particles, the yellow fluorescent particles may be cerium-doped yttrium aluminum garnet (Ce:YAG) scintillating crystal particles, and the green fluorescent particles may be aluminate (LuAG) particles.

[0045] In other possible embodiments, the fluorescent particles 520 may include any two of red, yellow, and green fluorescent particles. Researchers can adjust this based on the actual application scenario of the lighting device 200, and this embodiment is not specifically limited thereto. For example, the fluorescent particles 520 may include red and yellow fluorescent particles. In another example, the fluorescent particles 520 may include red and green fluorescent particles. It should be noted that when the fluorescent particles 520 include red fluorescent particles, the color rendering index of the illumination light can be significantly improved.

[0046] Specifically, the wavelength conversion layer 50 may be a fluorescent glass film that covers the side of the metal oxide transition layer 30 facing away from the light-transmitting unit 10. The fluorescent glass film refers to a fluorescent film in which fluorescent particles are doped into a glass matrix. The main components of the glass matrix may be SiO2-B2O3-Na2O.

[0047] In other words, the wavelength conversion layer 50 in this embodiment utilizes a glass-based inorganic encapsulation method. Compared to organic encapsulation methods such as silicone or resin, this method further improves the thermal conductivity of the wavelength conversion layer 50, thereby preventing problems such as ablation, blackening, and failure of the wavelength conversion layer 50 under prolonged exposure to high-power laser light. Therefore, the wavelength conversion layer 50 in this embodiment has the advantage of high thermal conductivity, ensuring that the wavelength conversion assembly 100 can function properly under high-power excitation light L.

[0048] In some possible embodiments, the thickness of the wavelength conversion layer 50 is greater than or equal to 50 μm and less than or equal to 80 μm. For example, the thickness of the wavelength conversion layer 50 can be 50 μm, 60 μm, 70 μm, 80 μm, and so on. Therefore, the relatively small thickness of the wavelength conversion layer 50 in this embodiment facilitates a compact design of the wavelength conversion component 100, thereby saving installation space for the lighting device 200.

[0049] This embodiment provides a wavelength conversion component 100 and an illumination device 200 equipped with the wavelength conversion component 100. The wavelength conversion component 100 may include a light-transmitting unit 10, a metal oxide transition layer 30, and a wavelength conversion layer 50. The light-transmitting unit 10 may include a light-incident surface 102 and a light-exiting surface 104, which are opposite to each other. Excitation light L enters the light-transmitting unit 10 via the light-incident surface 102. The metal oxide transition layer 30 is disposed on the light-exiting surface 104 of the light-transmitting unit 10. The wavelength conversion layer 50 is disposed on the side of the metal oxide transition layer 30 facing away from the light-transmitting unit 10 and is used to convert the excitation light L into converted light F.

[0050] Because the light incident surface 102 of the light-transmitting unit 10 is disposed on the optical path of the excitation light L, the excitation light L can sequentially transmit the light-transmitting unit 10 and the metal oxide transition layer 30 before entering the wavelength conversion layer 50 and being converted into the converted light F by the wavelength conversion layer 50. Therefore, the wavelength conversion component 100 in this embodiment adopts a transmissive structure. Compared to a reflective wavelength conversion component 100, this simplifies the optical path structure, making the overall structure of the lighting device 200 equipped with the wavelength conversion component 100 more compact and reasonable, thereby facilitating a miniaturized design of the lighting device 200.

[0051] In addition, since a metal oxide transition layer 30 is provided between the light-transmitting unit 10 and the wavelength conversion layer 50, the metal oxide transition layer 30 can play a role of transition bonding to improve the reliability of the connection between the light-transmitting unit 10 and the wavelength conversion layer 50, thereby realizing the integration and tight connection of the wavelength conversion component 100.

[0052] In the specification of this application, certain words are used to refer to specific components in the specification and claims. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of the components as the criterion for distinction. For example, "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0053] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only used to simplify the description for the convenience of describing this application, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0054] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; internal communication between two components; or mere surface contact. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wavelength conversion component, characterized in that: include: A light-transmitting unit, comprising a light-entry surface and a light-emitting surface that are opposite to each other; The excitation light can be incident on the light-transmitting unit from the light-incident surface; A metal oxide transition layer is provided on the light-emitting surface of the light-transmitting unit; as well as The wavelength conversion layer is arranged on a side of the metal oxide transition layer away from the light-transmitting unit, and is used for converting the excitation light into converted light.

2. The wavelength conversion component according to claim 1, wherein: The thickness of the metal oxide transition layer is greater than or equal to 5 nm and less than or equal to 80 nm.

3. The wavelength conversion component according to claim 1, wherein: The metal oxide transition layer is an aluminum oxide film, and the aluminum oxide film covers the light-emitting surface of the light-transmitting unit.

4. The wavelength conversion component according to any one of claims 1 to 3, characterized in that: The wavelength conversion layer is a fluorescent glass film, and the fluorescent glass film covers the side of the metal oxide transition layer away from the light-transmitting unit.

5. The wavelength conversion component according to any one of claims 1 to 3, characterized in that: The wavelength conversion layer is doped with fluorescent particles, and the fluorescent particles include at least two of red fluorescent particles, yellow fluorescent particles and green fluorescent particles.

6. The wavelength conversion component according to any one of claims 1 to 3, characterized in that: The wavelength conversion layer has a thickness greater than or equal to 50 μm and less than or equal to 80 μm.

7. The wavelength conversion component according to any one of claims 1 to 3, characterized in that: The light-transmitting unit includes a light-transmitting layer and a dichroic film, wherein the dichroic film is arranged between the light-transmitting layer and the metal oxide transition layer; The dichroic film is used for transmitting the excitation light and reflecting the converted light.

8. The wavelength conversion component according to claim 7, wherein: The excitation light is a blue laser, and the light-transmitting layer is a transparent sapphire layer.

9. A lighting device, characterized in that: include: a light source for generating excitation light; as well as The wavelength conversion component according to any one of claims 1 to 8, wherein the wavelength conversion component is arranged on the optical path of the excitation light, and the excitation light forms an illumination light after passing through the wavelength conversion component.

10. The lighting device according to claim 9, characterized in that The color rendering index of the lighting light is greater than or equal to 92; or / and The lumen efficiency of the lighting device is greater than or equal to 40 lm / W.

Images