Light mixing lens assembly and lighting device
By setting first lenses and second lenses in the mixed lens component of the lighting device, and setting a microstructure on its surface, the first and second mixed light of the light is realized, solving the uneven color of mixed color in the existing technology and the changes of light spots in the existing technology The big problem enhances the mixed effect and the uniformity of light spots.
Patent Information
- Application Number
- CN202323667550.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2033-12-29
AI Technical Summary
When the light mixing lenses in existing lighting devices deal with light sources of different colors, they are prone to problems such as uneven color mixing and larger spots.
Design a light mixing lens assembly, including a mounting barrel, a first lens and a second lens. The first lens is a convex lens, and its light entrance or light exit surface is provided with a first microstructure for primary light mixing; the second lens The light entrance surface or the light exit surface is provided with a second microstructure for secondary light mixing. The light is processed through secondary light mixing and convergence to improve the light mixing effect.
Effectively improve the mixed light effect, improve the uniformity of the mixed color of the outlet spots, while avoiding the influence of the light spot due to the impact of the microstructure surface, it is suitable for lighting devices such as small angles such as the light.
Smart Images
Figure CN222392732U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lighting equipment, in particular to a light mixing lens assembly and a lighting device. Background Art
[0002] At present, many lighting devices use multi-color chip integrated lamp beads as light sources to obtain lighting with different color temperatures. In order to obtain a lighting effect with uniform color temperature, a light mixing lens is usually set in the light emitting direction of the light source, that is, a light mixing structure is set on the lens, and the light emitted by different color light sources is mixed by the light mixing structure and then irradiated. However, due to the large spacing between the lamp beads, the light mixing effect of the light mixing lens in the prior art is still poor, and in practice, it is easy to have problems such as uneven color mixing and larger light spots. Utility Model Content
[0003] The utility model provides a light mixing lens assembly and an illuminating device, which are used to solve the problems of uneven color mixing and enlarged light spots in the light mixing lens of the illuminating device in the prior art.
[0004] The utility model provides a mixed light lens assembly, comprising:
[0005] A mounting tube is provided with a light outlet;
[0006] A first lens and a second lens are arranged in the mounting tube and distributed along the axial direction of the mounting tube, and the second lens is located between the first lens and the light outlet;
[0007] Among them, the first lens is a convex lens and its light incident surface or light exit surface is provided with multiple first microstructures to form a first microstructure surface for primary mixing of incident light; the light incident surface or light exit surface of the second lens is provided with multiple second microstructures to form a second microstructure surface for secondary mixing of incident light.
[0008] Optionally, the light mixing lens assembly provided by the utility model further includes:
[0009] A light-mixing film is arranged in the installation tube and located between the second lens and the light outlet.
[0010] Optionally, the second lens is provided with a first area and a second area, the first area is located at the center of the light incident surface or the light exit surface of the second lens, the second area surrounds the first area, and the second microstructure is disposed in the first area.
[0011] Optionally, a projection of each one or more adjacent first microstructures toward the light outlet overlaps at most partially with a projection of any one or more adjacent second microstructures toward the light outlet.
[0012] Optionally, the plurality of first microstructures are adjacent to each other and arranged in a petal grid.
[0013] Optionally, the petal grid is formed by interweaving a plurality of Fibonacci spiral lines.
[0014] Optionally, the plurality of second microstructures are adjacent to each other and are arranged in a multi-layer circular pattern outward from the center of the second microstructure surface.
[0015] Optionally, at least one of the first microstructure and the second microstructure is a beaded particle.
[0016] Optionally, the inner wall surface of the mounting tube is provided with a first step surface and a second step surface, the first step surface faces the light outlet, and the second step surface faces away from the light outlet;
[0017] The first lens is provided with a lens portion and a plurality of hooks connected to the lens portion, the first lens is engaged with the first step surface through the plurality of hooks, and the second lens and the light mixing film are abutted between the second step surface and the first lens.
[0018] The utility model also provides a lighting device, comprising a housing, a light source and any one of the above-mentioned mixed light lens components, wherein the light source is provided with light emitters of at least two colors, the light source and the lens component are arranged in the housing, and the lens component is located on the light emitting side of the light source.
[0019] Optionally, the light source is fixedly connected to the housing, and the mounting tube is threadedly connected to the housing, so that the light mixing lens assembly can be moved closer to or farther away from the light source.
[0020] The light mixing lens assembly and lighting device provided by the utility model are configured by arranging the first lens and the second lens at the same time in the direction of the light outlet in the installation tube, configuring the first lens as a convex lens, configuring the first microstructure surface on the light incident surface or the light exit surface, configuring the second microstructure surface on the light incident surface or the light exit surface of the second lens, mixing the light emitted by the light source through the first lens while converging the light, and then performing secondary light mixing on the converged light through the second lens, thereby effectively improving the light mixing effect, improving the uniformity of the color mixing of the exit light spot, and preventing the exit light spot from becoming larger due to the influence of the microstructure surface. The utility model is applied to a spotlight, and can improve the color mixing uniformity of the spotlight while ensuring that the spotlight emits at a small angle.
[0021] Furthermore, in the lighting device provided by the present invention, since it is provided with the light mixing lens assembly as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 It is a structural schematic diagram of the lighting device provided by the utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the light incident side of the second lens in the mixed light lens assembly provided by the utility model;
[0025] Figure 3 This is a schematic diagram of the structure of the light-emitting side of the first lens in the mixed light lens assembly provided by the utility model;
[0026] Figure 4 This is a schematic diagram of the structure of the light incident side of the second lens in the mixed light lens assembly provided by the utility model;
[0027] Figure 5 This is a schematic diagram of the light-emitting side structure of the second lens in the mixed light lens assembly provided by the utility model;
[0028] Figure 6 This is a schematic diagram of the installation tube structure in the mixed light lens assembly provided by the utility model;
[0029] Figure 7 It is a schematic diagram of the installation of the light source and the housing in the lighting device provided by the utility model;
[0030] Reference numerals:
[0031] 100, mixed light lens assembly; 11, mounting tube; 111, light outlet; 112, first step surface; 113, second step surface; 12, first lens; 121, first light incident surface; 1211, first microstructure surface; 12111, first microstructure; 122, first light emitting surface; 123, first support body; 1231, hook; 13, second lens; 131, second light incident surface; 1311, second microstructure surface; 13111, second microstructure; 1312, second area; 132, second light emitting surface; 133, second support body; 14, mixed light film; 200, housing; 300, light source; 31, mounting seat; 32, light source board; 321, lamp beads. DETAILED DESCRIPTION
[0032] In order to make the purpose, technical solution and advantages of this embodiment clearer, the technical solution in this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is a part of the embodiment, not all of the embodiments. Based on the embodiments in this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this embodiment.
[0033] In the description of this embodiment, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are for the purpose of clearly explaining the numbering of product components and do not represent any substantial difference. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances.
[0034] Combine the following Figures 1 to 7 The light mixing lens assembly of this embodiment is described.
[0035] like Figure 1 As shown, the light mixing lens assembly 100 provided in this embodiment includes a mounting tube 11, a first lens 12 and a second lens 13. The mounting tube 11 is provided with a light outlet 111. The first lens 12 and the second lens 13 are arranged in the mounting tube 11 and distributed along the axial direction of the mounting tube 11, and the second lens 13 is located between the first lens 12 and the light outlet 111. Among them, the first lens 12 is a convex lens and its light incident surface or light exit surface is provided with a first microstructure 12111, forming a first microstructure surface 1211, which is used for primary light mixing of incident light. The light incident surface or light exit surface of the second lens 13 is provided with a second microstructure 13111, forming a second microstructure surface 1311, which is used for secondary light mixing of incident light.
[0036] See also Figure 2-Figure 5 The first light incident surface 121 of the first lens 12 and the second light incident surface 131 of the second lens 13 are both surfaces away from the light exit port 111 , and the first light exit surface 122 of the first lens 12 and the second light exit surface 132 of the second lens 13 are both surfaces facing the light exit port 111 .
[0037] The light mixing lens assembly is used to be installed on the light emitting side of the light source. The light of multiple colors emitted by the light source is sequentially mixed twice by the first lens 12 and the second lens 13 and then emitted from the light outlet 111 .
[0038] Among them, at least one of the first light incident surface 121 and the first light emitting surface 122 of the first lens 12 is a convex surface, so that the first lens 12 has a convergence effect on the light emitted by the light source, and the converged light is then mixed again by the second lens 13. Figure 5 As shown, the first light emitting surface 122 of the first lens 12 is configured as a convex surface.
[0039] The light mixing lens assembly 100 provided in this embodiment is configured by setting the first lens 12 and the second lens 13 at the same time in the direction of the light outlet 111 in the mounting tube 11, configuring the first lens 12 as a convex lens, and configuring the first microstructure surface 1211 on its light incident surface or light exit surface, and configuring the second microstructure surface 1311 on the light incident surface or light exit surface of the second lens 13, mixing the light emitted by the light source through the first lens 12 while converging the light, and then performing secondary light mixing on the converged light through the second lens 13, which effectively improves the light mixing effect, improves the uniformity of the color mixing of the exit light spot, and at the same time prevents the exit light spot from becoming larger due to the influence of the microstructure surface. This embodiment is applied to spotlights, and can improve the color mixing uniformity of the spotlights while ensuring that the spotlights emit at a small angle.
[0040] Furthermore, the light-mixing lens assembly 100 provided in this embodiment further includes a light-mixing film 14 . The light-mixing film 14 is disposed in the mounting tube 11 and is located between the second lens 13 and the light outlet 111 .
[0041] Specifically, micron-scale microstructures are distributed on the light mixing film 14. After light is mixed twice by the first lens 12 and the second lens 13, the light is mixed once more by the light mixing film 14, which further improves the light mixing effect and the uniformity of the color mixing of the emitted light spot.
[0042] like Figure 2 As shown, in this embodiment, the second lens 13 has a first area and a second area 1312. The first area is located at the center of the light incident surface or the light exit surface of the second lens 13, the second area 1312 surrounds the first area, and the second microstructure 13111 is disposed in the first area.
[0043] It can be understood that the entire surface of the first light incident surface 121 or the first light emitting surface 122 of the first lens 12 is set as a first microstructure surface 1211, that is, multiple first microstructures 12111 are distributed over the first light incident surface 121 or the first light emitting surface 122 of the first lens 12 to mix all the light emitted by the light source.
[0044] Only the first region located at the center of the second lens 13 is provided with the second microstructure 13111, so that the first region forms the second microstructure 13111. When the second microstructure surface 1311 is provided on the second light incident surface 131 of the second lens 13, see Figure 2 and Figure 3 , the second microstructure surface 1311 is disposed in the central area of the second light incident surface 131, and the edge area of the second light incident surface 131 and the second light emitting surface 132 are not provided with microstructures for light mixing. When the second microstructure surface 1311 is disposed on the second light emitting surface 132 of the second lens 13, the second microstructure surface 1311 is disposed in the central area of the second light emitting surface 132, and the edge area of the second light emitting surface 132 and the second light incident surface 131 are not provided with microstructures for light mixing.
[0045] In this embodiment, a second microstructure 13111 is arranged in the central area of the light incident surface or the light exiting surface of the second lens 13 to form a second microstructure surface 1311, so that the light with poor mixing in the middle part emitted from the first lens 12 is further mixed after passing through the second microstructure surface 1311 of the second lens 13, and the light in the edge part which is less likely to be poorly mixed is no longer mixed, so that the second microstructure surface 1311 does not affect the optical angle of the overall light emitted from the second lens 13. In other words, the size of the light spot emitted from the first lens 12 is comparable to that of the light spot emitted from the second lens 13, that is, the light spot emitted from the second lens 13 will not become larger due to the influence of the second microstructure surface 1311. This embodiment not only greatly improves the color mixing uniformity of the emitted light spot, but also ensures a small light spot.
[0046] In this embodiment, the projection of each one or more adjacent first microstructures 12111 toward the light outlet 111 and the projection of any one or more adjacent second microstructures 13111 toward the light outlet 111 at most partially overlap.
[0047] It is understandable that the plurality of first microstructures 12111 and the plurality of second microstructures 13111 may be arranged randomly or according to a specific rule. In the case where the plurality of first microstructures 12111 and the plurality of second microstructures 13111 are arranged along a specific rule, the arrangement of the plurality of first microstructures 12111 is different from the arrangement of the plurality of second microstructures 13111.
[0048] Specifically, due to different arrangements, the projections of each plurality of adjacent first microstructures 12111 toward the light outlet 111 do not overlap or only partially overlap with the projections of any plurality of adjacent second microstructures 13111 toward the light outlet 111. For example, the projections of each three adjacent first microstructures 12111 toward the light outlet 111 do not overlap or only partially overlap with the projections of any three adjacent second microstructures 13111 toward the light outlet 111.
[0049] Alternatively, due to different arrangements, the projection of each first microstructure 12111 toward the light outlet 111 does not overlap or only partially overlaps with the projection of any second microstructure 13111 toward the light outlet 111. In this case, the overlap of the projections of the multiple first microstructures 12111 and the multiple second microstructures 13111 toward the light outlet 111 is the lowest.
[0050] In the related art, the microstructures used for light mixing on the lens are generally arranged in a regular pattern, such as hexagons, circles, etc., resulting in the light spot obtained after light mixing through the lens having patterns of specific shapes, such as circles, hexagons, etc., which affects the final light mixing effect.
[0051] In this embodiment, the first lens 12 and the second lens 13 are provided, and two microstructure surfaces with different microstructure arrangements are provided on the first lens 12 and the second lens 13, so that the first lens 12 and the second lens 13 mix light in different ways respectively, which can prevent the appearance of specific shapes of patterns in the light spot to a large extent while ensuring uniform light mixing, thereby improving the light mixing effect.
[0052] like Figure 4 As shown, in an optional embodiment, the plurality of first microstructures 12111 are adjacent to each other and arranged in a petal grid. Specifically, the plurality of first microstructures 12111 are arranged in a petal grid with the center of the first lens 12 as the center.
[0053] The petal grid can be formed by interweaving a plurality of Fibonacci spirals, that is, a plurality of first microstructures 12111 are arranged into a plurality of Fibonacci spirals, and the plurality of Fibonacci spirals are arranged around the center of the first lens 12 and spread outward from the center of the first lens 12 layer by layer, thereby forming layers of petal grids.
[0054] It should be noted that the petal grid can also be formed by interweaving multiple other types of spiral lines, such as Archimedean spirals. Arranging multiple first microstructures 12111 in a spiral arrangement can avoid having specific shapes of patterns in the light spot obtained after light mixing, which is conducive to improving the light mixing effect.
[0055] like Figure 2 As shown, in an optional embodiment, the plurality of second microstructures 13111 are adjacent to each other and arranged in multiple layers of circles from the center of the second microstructure surface 1311. Specifically, the plurality of second microstructures 13111 are arranged in a plurality of adjacent concentric circles with the center of the second lens 13 as the center.
[0056] In this embodiment, at least one of the first microstructure 12111 and the second microstructure 13111 is a beaded surface particle. In other words, at least one of the first microstructure surface 1211 and the second microstructure surface 1311 is a beaded surface formed by connecting a plurality of beaded surface particles. The size of each beaded surface particle is similar.
[0057] It should be noted that the first microstructure surface 1211 and the second microstructure surface 1311 in this embodiment are not limited to bead surfaces, but can also be other forms of microstructure surfaces such as scale armor surfaces. This embodiment does not specifically limit this, as long as it can play a certain light mixing role. The arrangement of the multiple first microstructures 12111 in this embodiment is not limited to the above-mentioned petal grid arrangement, and the arrangement of the multiple second microstructures 13111 is not limited to the above-mentioned multi-layer circular arrangement. It can be flexibly set according to needs or process conditions.
[0058] As a specific example, the first microstructure 12111 and the second microstructure 13111 are both beaded particles, multiple first microstructures 12111 are adjacent to each other and arranged in a petal grid, and the petal grid is formed by interweaving multiple Fibonacci spiral lines, and multiple second microstructures 13111 are adjacent to each other and arranged in multiple layers of circles from the center of the second microstructure surface 1311 to the outside.
[0059] like Figure 6 As shown, in this embodiment, the inner wall surface of the mounting tube 11 is provided with a first step surface 112 and a second step surface 113. The first step surface 112 faces the light outlet 111, and the second step surface 113 faces away from the light outlet 111. The first lens 12 includes a first lens portion and a plurality of hooks 1231 connected to the first lens portion, and the first lens 12 is engaged with the first step surface 112 through the plurality of hooks 1231. The second lens 13 and the light mixing film 14 are in contact between the second step surface 113 and the first lens 12.
[0060] The mounting tube 11 is a cylindrical structure with two ends open, and one end is open to form a light outlet 111. When assembling the light mixing lens assembly, the light mixing film 14, the second lens 13 and the first lens 12 are sequentially arranged in the mounting tube 11 from the end of the mounting tube 11 away from the light outlet 111.
[0061] Specifically, the light-mixing film 14 is first set to the second step surface 113 in the installation tube 11, and the second step surface 113 is used to limit the distance between the light-mixing film 14 and the light outlet 111. Then, the second lens 13 is pushed into the installation tube 11 and the light-mixing film 14 is pressed against the second step surface 113. Finally, the first lens 12 is pushed into the second step surface 113, so that the multiple hooks 1231 are locked with the first step surface 112, thereby realizing the clamping connection between the first lens 12 and the installation tube 11, and at the same time, the second lens 13 and the light-mixing film 14 are pressed between the first lens 12 and the second step surface 113.
[0062] It should be noted that the arrangement of the light-mixing film 14 can be adjusted according to the hardness of the material of the light-mixing film 14. When the material of the light-mixing film 14 is relatively hard, the light-mixing film 14 can be arranged in the above-mentioned assembly manner. When the material of the light-mixing film 14 is relatively soft, the light-mixing film 14 can be first attached to the second light-emitting surface 132 of the second lens 13, and then the second lens 13 and the light-mixing film 14 can be pressed against the first lens 12 and the second step surface 113 as a whole.
[0063] Specifically, the first lens 12 includes a first lens portion and a first support body 123 connected to the periphery of the first lens portion. The first support body 123 includes a plurality of hooks 1231, such as Figure 5 The three hooks 1231 are evenly arranged around the first lens portion. A side of the second step surface 113 of the mounting tube 11 away from the light outlet 111 is provided with an annular groove, and the groove wall of the annular groove facing the light outlet 111 forms a first step surface 112 .
[0064] The second lens 13 includes a second lens portion and a second support body 133 connected to the periphery of the second lens portion. The second support body 133 is supported between the first lens 12 and the second stepped surface 113 .
[0065] Among them, the first support body 123 is arranged on the light-emitting side of the first lens portion, and the second support body 133 is arranged on the light-incident side of the second lens portion. The second support body 133 is pressed tightly between the second step surface 113 and the first support body 123, so that a certain space can be created between the first lens portion and the second lens portion.
[0066] like Figure 1 As shown, this embodiment also provides a lighting device, including a housing 200, a light source 300 and any one of the above-mentioned light mixing lens assemblies 100. The light source 300 is provided with lamp beads of at least two colors, the light source 300 and the light mixing lens assembly 100 are arranged in the housing 200, and the light mixing lens assembly 100 is located on the light emitting side of the light source 300.
[0067] Specifically, Figure 7 As shown, the light source 300 includes a mounting base 31 and a light source board 32 . The light source board 32 is provided with a plurality of lamp beads 321 of different colors. The light source board 32 is fixedly connected to the mounting base 31 by screws, and the mounting base 31 is fixedly connected to the housing 200 .
[0068] Optionally, the light source 300 is a CSP light source, that is, the lamp bead 321 is packaged in a CSP chip. Optionally, the inner wall surface of the installation tube 11 is provided with a light shielding layer.
[0069] Furthermore, the light source 300 is fixedly connected to the housing 200 , and the mounting tube 11 is threadedly connected to the housing 200 , so that the light mixing lens assembly 100 can be moved closer to or farther away from the light source 300 .
[0070] The housing 200 is a cylindrical structure, the inner wall of the housing 200 is provided with an internal thread, and the outer wall of the mounting tube 11 is provided with an external thread matching therewith, so that the mounting tube 11 is threadedly connected with the inner wall of the housing 200. When in use, the distance between the mounting tube 11 and the light source 300 can be adjusted by turning the knob of the mounting tube 11, so as to achieve optical focusing, thereby achieving adjustment of the angle of the light emitted by the lighting device, that is, achieving adjustment of the light spot size.
[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this embodiment, rather than to limit it. Although this embodiment has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of each embodiment of this embodiment.
Claims
1. A light mixing lens assembly, characterized in that: include: A mounting tube is provided with a light outlet; A first lens and a second lens are arranged in the mounting tube and distributed along the axial direction of the mounting tube, and the second lens is located between the first lens and the light outlet; Among them, the first lens is a convex lens and its light incident surface or light exit surface is provided with multiple first microstructures to form a first microstructure surface for primary mixing of incident light; the light incident surface or light exit surface of the second lens is provided with multiple second microstructures to form a second microstructure surface for secondary mixing of incident light.
2. The light mixing lens assembly according to claim 1, characterized in that: Also includes: A light-mixing film is arranged in the installation tube and located between the second lens and the light outlet.
3. The light mixing lens assembly according to claim 1, characterized in that: The second lens is provided with a first area and a second area, the first area is located at the center of the light incident surface or the light exit surface of the second lens, the second area surrounds the first area, and the second microstructure is arranged in the first area.
4. The light mixing lens assembly according to claim 1, characterized in that: The projection of each one or more adjacent first microstructures toward the light outlet overlaps at most partially with the projection of any one or more adjacent second microstructures toward the light outlet.
5. The light mixing lens assembly according to claim 1, characterized in that: The plurality of first microstructures are adjacent to each other and arranged in a petal grid.
6. The light mixing lens assembly according to claim 5, characterized in that: The petal grid is formed by interweaving a plurality of Fibonacci spiral lines.
7. The light mixing lens assembly according to any one of claims 1 to 6, characterized in that: The plurality of second microstructures are adjacent to each other and are arranged in a multi-layer circular pattern from the center of the second microstructure surface outward.
8. The light mixing lens assembly according to any one of claims 1 to 6, characterized in that: At least one of the first microstructure and the second microstructure is a beaded particle.
9. The light mixing lens assembly according to claim 2, characterized in that: The inner wall surface of the installation tube is provided with a first step surface and a second step surface, the first step surface faces the light outlet, and the second step surface faces away from the light outlet; The first lens includes a first lens portion and a plurality of hooks connected to the first lens portion, the first lens is engaged with the first step surface through the plurality of hooks, and the second lens and the light mixing film are abutted between the second step surface and the first lens.
10. A lighting device, characterized in that: It comprises a housing, a light source and a mixing lens assembly according to any one of claims 1 to 9, wherein the light source is provided with lamp beads of at least two colors, the light source and the mixing lens assembly are arranged in the housing, and the mixing lens assembly is located on the light emitting side of the light source.
11. The lighting device according to claim 10, characterized in that: The light source is fixedly connected to the housing, and the mounting tube is threadedly connected to the housing, so that the light mixing lens assembly can be close to or away from the light source.