Energy-saving anti-dazzle wall washer lamp shell

The design of the trapezoidal shell and adjustment mechanism solves the problems of light waste and glare in traditional wall washer lights, achieving energy-saving and comfortable lighting effects, and improving light utilization and equipment stability.

CN224121116UActive Publication Date: 2026-04-14CHINA TELLURIUM OPTOELECTRONICS TECHNOLOGY (HARBIN) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-06-13
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

The traditional wall washer light housing design results in half of the light not reaching the wall and advertising boards, causing energy waste and glare, affecting lighting comfort, and failing to meet energy conservation and environmental protection requirements.

Method used

The device employs a trapezoidal shell structure and adjustment mechanism. Through the cooperation of magnetic columns and toothed rings, the angle of the mounting box can be adjusted, guiding wasted light to the light-receiving surface. Combined with the light-transmitting mechanism and sealing mechanism, it improves light utilization and sealing performance.

Benefits of technology

Significant energy savings, reduced energy consumption and operating costs, reduced glare, improved lighting environment quality, and ensure effective light illumination and equipment stability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of lighting equipment, and discloses an energy-saving anti-dazzle wall washing lamp shell which comprises a trapezoid shell and a mounting plate, the inner side of the trapezoid shell is rotationally connected with a mounting box, an adjusting mechanism is arranged on the inner side of the trapezoid shell, a mounting mechanism is arranged on the top of the mounting plate, and the adjusting mechanism is connected with the mounting box. A fixing mechanism is arranged at the top of the mounting plate, a lighting mechanism is arranged on the inner side of the mounting box, a light transmitting mechanism is arranged on the inner side of the mounting box, and a sealing mechanism is arranged on the rear side of the trapezoidal shell; the adjusting mechanism comprises a rotating shaft, and the rotating shaft is fixedly connected to the left side of the mounting box. According to the LED lamp, the magnetic attraction column is pulled, mutual separation and combination of the gear shell and the gear ring are achieved, angle adjustment of the installation box is completed, and meanwhile, due to the outer shell structure of the trapezoid shell, the remarkable energy-saving effect is achieved, energy consumption and use cost are reduced, glare is effectively reduced, and the quality of the lighting environment is improved.
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Description

Technical Field

[0001] This utility model relates to the field of lighting equipment technology, and in particular to an energy-saving anti-glare wall washer housing. Background Technology

[0002] Wall washer lights, as a type of lighting fixture used in architectural decorative lighting and landscape lighting, create a soft and layered lighting effect by evenly projecting light onto the surface of walls or objects. Their housings not only bear the important mission of protecting the core components such as internal light sources and driving power supplies, but also have a decisive impact on the heat dissipation performance, optical effects, and overall aesthetics of the fixtures. Against the backdrop of global advocacy for energy conservation and emission reduction, the design of the housings of energy-saving and anti-glare wall washer lights is becoming increasingly critical.

[0003] However, traditional wall washer light housings have sides perpendicular to the bottom, with both sides at the same height, presenting a rectangular or square structure in cross-section. In actual use, after the light emitted by the LEDs is reflected by the lens, only half of the light reaches the desired illuminated surface of the wall or advertising board, while the other half shines onto the ground or air. This not only wastes a significant amount of energy and increases operating costs, but the light shining onto the ground or air also creates glare, negatively impacting the surrounding environment and human vision, reducing the comfort of the lighting experience, and failing to meet modern society's requirements for energy conservation and environmental protection. Therefore, an energy-saving and anti-glare wall washer light housing is proposed to solve these problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an energy-saving anti-glare wall washer light housing, which aims to improve the problem in the prior art where the light emitted by the lamp beads is difficult to fully illuminate the light-receiving surface of the wall and advertising board after being reflected by the lens, resulting in a large amount of energy waste.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an energy-saving anti-glare wall washer housing, comprising a trapezoidal housing and a mounting plate, wherein a mounting box is rotatably connected to the inner side of the trapezoidal housing, an adjustment mechanism is provided on the inner side of the trapezoidal housing, a mounting mechanism is provided on the top of the mounting plate, a fixing mechanism is provided on the top of the mounting plate, a lighting mechanism is provided on the inner side of the mounting box, a light-transmitting mechanism is provided on the inner side of the mounting box, and a sealing mechanism is provided on the rear side of the trapezoidal housing;

[0006] The adjustment mechanism includes a rotating shaft, which is fixedly connected to the left side of the mounting box. A hollow shaft is fixedly connected to the right side of the mounting box. The right end of the hollow shaft is rotatably connected to the right side of the trapezoidal shell. A toothed ring is fixedly connected to the right side of the trapezoidal shell. A magnetic column is slidably connected to the right end of the hollow shaft. Two limiting blocks are fixedly connected to the left end of the outer wall of the magnetic column. A toothed shell is fixedly connected to the outer wall of the magnetic column.

[0007] As a further description of the above technical solution:

[0008] The mounting mechanism includes two mounting slots located at the top left and right ends of the mounting plate. A limiting plate is fixedly connected to the inner side of each mounting slot. A limiting groove is formed on an adjacent side of each limiting plate. A retaining plate is slidably connected to the inner side of each limiting groove. A screw is rotatably connected to the inner side of each mounting slot. An adjacent side of each retaining plate is threaded to the outer wall of the screw. A locking plate is fixedly connected to the bottom left and right ends of the trapezoidal shell. A fitting assembly is provided on the top of the mounting plate.

[0009] As a further description of the above technical solution:

[0010] The bonding assembly includes a sealing ring, which is fixedly connected to the top of the mounting plate.

[0011] As a further description of the above technical solution:

[0012] The fixing mechanism includes two screw holes, both of which are located at the top left and right ends of the mounting plate, and bolts are threaded onto the inner sides of both screw holes.

[0013] As a further description of the above technical solution:

[0014] The lighting mechanism includes an aluminum substrate, which is fixedly connected to the bottom inner side of the mounting box, and multiple LED beads are fixedly connected to the top of the aluminum substrate.

[0015] As a further description of the above technical solution:

[0016] The light-transmitting mechanism includes two mounting slots, both of which are located on the front and rear sides of the interior of the mounting box, and a lens is fixedly connected between the two mounting slots.

[0017] As a further description of the above technical solution:

[0018] The sealing mechanism includes two through holes, both of which are located on the rear side of the trapezoidal shell, and rubber sealing blocks are fixedly connected to the inner side of each of the two through holes.

[0019] As a further description of the above technical solution:

[0020] The bottom left and right ends of the mounting box are fixedly connected with connecting wires, and multiple drainage holes are opened on the front and back sides of the trapezoidal shell.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the magnetic column is pulled outward to disengage the toothed shell from the toothed ring. After the installation box is adjusted, the magnetic column is attracted to the hollow shaft from the left and right sides, causing the toothed shell to engage with the toothed ring. This completes the angle adjustment of the installation box. At the same time, the trapezoidal shell structure guides all or part of the light that would otherwise be wasted on the ground or in the air to the desired light-receiving surface. This not only achieves significant energy-saving effects and reduces energy consumption and operating costs, but also effectively reduces glare and improves the quality of the lighting environment.

[0023] 2. In this utility model, the mounting plate is installed at a designated position by bolts. When the trapezoidal shell and the mounting plate are in contact with each other, the locking plate is inserted into the mounting slot. At this time, the rotating screw drives the locking plate to slide backward, and the locking plate engages with the locking plate. This facilitates subsequent installation and replacement when installing the wall washer light. Attached Figure Description

[0024] Figure 1 This is a perspective view of the housing of an energy-saving and anti-glare wall washer lamp proposed in this utility model;

[0025] Figure 2 This is a front view of the housing of an energy-saving and anti-glare wall washer lamp proposed in this utility model;

[0026] Figure 3 This is an exploded view of the sealing mechanism of the housing of an energy-saving and anti-glare wall washer lamp proposed in this utility model;

[0027] Figure 4 This is an exploded view of the lens of the housing of an energy-saving and anti-glare wall washer lamp proposed in this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the mounting plate for the housing of an energy-saving and anti-glare wall washer lamp proposed in this utility model;

[0029] Figure 6 for Figure 5 Enlarged view of point A.

[0030] Legend:

[0031] 1. Trapezoidal shell; 2. Mounting plate; 3. Mounting box; 4. Adjustment mechanism; 401. Rotating shaft; 402. Hollow shaft; 403. Gear ring; 404. Magnetic column; 405. Limiting block; 406. Gear shell; 5. Mounting mechanism; 501. Mounting slot; 502. Screw; 503. Clamping plate; 504. Limiting plate; 505. Limiting groove; 506. Clamping plate; 507. Fitting assembly; 5071. Sealing ring; 6. Fixing mechanism; 601. Screw hole; 602. Bolt; 7. Lighting mechanism; 701. Aluminum substrate; 702. Lamp bead; 8. Light transmission mechanism; 801. Mounting groove; 802. Lens; 9. Sealing mechanism; 901. Perforation; 902. Rubber sealing block; 10. Connecting wire; 11. Drain hole. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Reference Figure 2 , Figure 3 and Figure 4 This utility model provides an embodiment of an energy-saving anti-glare wall washer light housing, comprising a trapezoidal shell 1 and a mounting plate 2. A mounting box 3 is rotatably connected to the inner side of the trapezoidal shell 1. By altering the traditional shell structure, the trapezoidal shell 1 changes the angle of light illumination, guiding all or part of the light that would otherwise be wasted on the ground or in the air to the desired light-receiving surface. This not only achieves significant energy savings, reducing energy consumption and operating costs, but also effectively reduces glare and improves the quality of the lighting environment. The mounting box 3 can be adjusted in angle using an adjustment mechanism 4. An adjustment mechanism 4 is provided on the inner side of the trapezoidal shell 1, and an installation mechanism 5 is provided on the top of the mounting plate 2. The installation mechanism 5 is used for quick installation between the mounting plate 2 and the trapezoidal shell 1. A fixing mechanism 6 is provided on the top of the mounting plate 2 to reinforce the mounting plate 2 in a designated position. An illumination mechanism 7 is provided on the inner side of the mounting box 3 to provide a light source. A light transmission mechanism 8 is provided on the inner side of the mounting box 3 to concentrate the light on the light-receiving surface. A sealing mechanism 9 is provided on the rear side of the trapezoidal shell 1 to improve the internal sealing of the trapezoidal shell 1.

[0034] The adjustment mechanism 4 includes a rotating shaft 401, which is fixedly connected to the left side of the mounting box 3. A hollow shaft 402 is fixedly connected to the right side of the mounting box 3. The mounting box 3 is rotatably mounted in the trapezoidal shell 1 via the rotating shafts 401 and hollow shafts 402 on both sides, allowing the mounting box 3 to be angled. The right end of the hollow shaft 402 is rotatably connected to the right side of the trapezoidal shell 1. A toothed ring 403 is fixedly connected to the right side of the trapezoidal shell 1. The toothed ring 403 is a fixed part in the adjustment mechanism 4. A magnetic column 404 is slidably connected between the toothed ring 403 and the right end of the hollow shaft 402. The magnetic column 404 has magnetic force. The left end of the outer wall of the magnetic column 404... Two limiting blocks 405 are fixedly connected and are horizontally slidably installed in the hollow shaft 402. During the rotation of the hollow shaft 402, the magnetic column 404 is driven to rotate synchronously. The outer wall of the magnetic column 404 is fixedly connected with a toothed shell 406. When it is necessary to adjust the angle of the mounting box 3, the magnetic column 404 is pulled outward, causing the toothed shell 406 to fall off the toothed ring 403. After the adjustment of the mounting box 3 is completed, the magnetic column 404 is magnetically attracted to the hollow shaft 402, and the toothed shell 406 is engaged in the toothed ring 403, thus completing the fixing of the mounting box 3 and realizing the angle adjustment.

[0035] Specifically, the rotating shaft 401 and the hollow shaft 402 work together to allow the mounting box 3 to be installed inside the trapezoidal shell 1 through their rotation, and to allow for flexible angle adjustment. The gear ring 403, as a fixed part in the adjustment mechanism 4, is slidably connected to the right end of the hollow shaft 402. Furthermore, the gear ring 403 is slidably connected to a magnetically attached column 404. Two limiting blocks 405 are fixed to the left end of the outer wall of the magnetically attached column 404. These two limiting blocks 405 are horizontally slidably installed inside the hollow shaft 402. During the rotation of the hollow shaft 402, the magnetic column 404 is driven to rotate synchronously. The outer wall of the magnetic column 404 is also fixed with a toothed shell 406. When the angle of the mounting box 3 needs to be adjusted, the operator can pull the magnetic column 404 outward, so that the toothed shell 406 will fall off the toothed ring 403. After the angle of the mounting box 3 is adjusted, the magnetic column 404 will automatically adhere to the hollow shaft 402 due to the magnetic force. At this time, the toothed shell 406 will re-engage on the toothed ring 403, thereby completing the fixing of the mounting box 3 and realizing the angle adjustment function.

[0036] Reference Figure 1 , Figure 5 and Figure 6The mounting mechanism 5 includes two mounting slots 501, which are located at the top left and right ends of the mounting plate 2. Each mounting slot 501 has a limiting plate 504 fixedly connected to its inner side, and the limiting plate 504 is fixed within the mounting slot 501. Each adjacent side of the limiting plate 504 has a limiting groove 505, and each inner side of the limiting groove 505 has a sliding locking plate 503. The locking plate 503 slides within the limiting groove 505 on the limiting plate 504. Each inner side of the mounting slot 501 is rotatably connected to a screw 502. Each adjacent side of the locking plate 503 is threaded to the outer wall of the screw 502, and each adjacent end of the locking plate 503 is connected to the screw 502. Rotating the screw 502 drives the locking plate 503 to slide. Each bottom left and right end of the trapezoidal shell 1 is fixedly connected to a locking plate 506. When the... After the snap-fit ​​plate 506 is inserted into the mounting slot 501, the snap-fit ​​plate 503 snaps into the snap-fit ​​plate 506, completing the quick installation of the trapezoidal shell 1. The top of the mounting plate 2 is provided with a bonding component 507, which includes a sealing ring 5071. The sealing ring 5071 is fixedly connected to the top of the mounting plate 2. When the trapezoidal shell 1 and the mounting plate 2 are bonded to each other, the sealing ring 5071 is sandwiched between the two to achieve a sealing treatment. The fixing mechanism 6 includes two screw holes 601, which are both opened at the top left and right ends of the mounting plate 2. The inner side of the two screw holes 601 is threaded with bolts 602. When installing the wall washer light, in order to facilitate subsequent installation and replacement, the mounting plate 2 is placed in the designated position, and the bolts 602 in the screw holes 601 are rotated to complete the quick installation of the mounting plate 2. With the cooperation of the mounting mechanism 5, the installation and disassembly are completed.

[0037] Specifically, the mounting slots 501 are located on both sides of the mounting plate 2, ensuring the symmetry and stability of the structure. A limiting plate 504 is fixed to the inner side of each mounting slot 501. Limiting grooves 505 are formed on adjacent sides of the two limiting plates 504, providing positioning for subsequent components. A retaining plate 503 slides inside the limiting grooves 505, freely sliding within the limiting grooves 505 on the limiting plates 504. Furthermore, screws 502 are rotatably connected to the inner sides of the two mounting slots 501, providing rotational power for the entire mounting mechanism 5. Thus, when the screws 502 are rotated, the retaining plate 503 slides along them. When the engaging plate 506 is inserted, the retaining plate 503... After the slot 501 is inserted, the clamping plate 503 will engage with the clamping plate 506, thereby achieving quick installation of the trapezoidal shell 1. The top of the mounting plate 2 is also specially provided with a fitting component 507. When the trapezoidal shell 1 and the mounting plate 2 are fitted together, the sealing ring 5071 is sandwiched between the two to ensure the reliability of the sealing treatment. The fixing mechanism 6 consists of two screw holes 601, and a bolt 602 is threaded on the inner side of each screw hole 601. When installing the wall washer light, in order to facilitate subsequent installation and replacement, the mounting plate 2 is first placed in the designated position. Then, by rotating the bolt 602 in the screw hole 601, the mounting plate 2 can be easily and quickly installed. With the use of the mounting mechanism 5, the entire installation and disassembly process becomes simple and quick.

[0038] Reference Figure 1 , Figure 3 and Figure 4 The lighting mechanism 7 includes an aluminum substrate 701, which is fixedly connected to the bottom inner side of the mounting box 3. Multiple LED beads 702 are fixedly connected to the top of the aluminum substrate 701. The trapezoidal shell 1 can be made of materials with good heat dissipation performance and mechanical strength, such as aluminum alloy, to ensure the stability and safety of the wall washer light during long-term use. The aluminum substrate 701 should have good electrical and thermal conductivity to ensure the normal operation of the LED beads 702 and effective heat dissipation. The light transmission mechanism 8 includes two mounting slots 801, both located on the front and rear sides inside the mounting box 3. A lens 802 is fixedly connected between the two mounting slots 801. The mirror 802 needs to be made of a material with good light transmittance and stable optical performance to ensure good light transmission and distribution. The sealing mechanism 9 includes two through holes 901, both of which are opened on the rear side of the trapezoidal shell 1. Rubber sealing blocks 902 are fixedly connected to the inner side of each of the two through holes 901. The bottom left and right ends of the mounting box 3 are fixedly connected to the connecting wires 10, which connect between the through holes 901 and seal the gaps with the rubber sealing blocks 902 to prevent dust from entering and to prevent wear. Multiple drainage holes 11 are opened on the front and rear sides of the trapezoidal shell 1. The drainage holes 11 are used to drain the water generated inside.

[0039] Specifically, the aluminum substrate 701 is fixed to the bottom inner side of the mounting box 3, and multiple LED beads 702 are mounted on the upper surface of the aluminum substrate 701. These LED beads 702 are responsible for emitting light. The material selection of the trapezoidal shell 1 is crucial. It is usually made of materials with excellent heat dissipation performance and mechanical strength, such as aluminum alloy, to ensure the stability and safety of the wall washer light during long-term operation. The aluminum substrate 701 itself should also have excellent electrical and thermal conductivity, which is essential for ensuring the normal operation of the LED beads 702 and the effective dissipation of heat. The light transmission mechanism 8 consists of two mounting slots 801, which are respectively opened on the front and rear sides of the interior of the mounting box 3. The lens 802 is fixed in place. The material of the lens 802 needs to have good light transmission and stable optical performance to ensure that light can be transmitted and distributed well. The sealing mechanism 9 includes two through holes 901, which are both opened on the rear side of the trapezoidal shell 1. A rubber sealing block 902 is fixed inside each through hole 901. These rubber sealing blocks 902 are used to seal the through holes 901 to prevent dust from entering the interior and to avoid wear. The connecting line 10 connects the through holes 901 and seals the gaps through the rubber sealing blocks 902 to ensure the long-term stable operation of the equipment. In addition, the drain hole 11 is used to drain the moisture generated inside to prevent water vapor from damaging the equipment.

[0040] Working principle: First, when the angle of the mounting box 3 needs to be adjusted, the magnetic column 404 is pulled outward, causing the toothed shell 406 to detach from the toothed ring 403. After the adjustment of the mounting box 3 is completed, the magnetic column 404 is magnetically attracted to the hollow shaft 402, causing the toothed shell 406 to engage with the toothed ring 403, thus completing the fixing of the mounting box 3 and realizing angle adjustment. The outer shell structure of the trapezoidal shell 1 guides all or part of the light that would otherwise be wasted on the ground or in the air to the desired light-receiving surface, which not only achieves significant energy-saving effect and reduces energy consumption and operating costs, but also effectively reduces glare and improves the quality of the lighting environment.

[0041] Furthermore, the mounting plate 2 is placed in the designated position, and the bolt 602 in the screw hole 601 is rotated to complete the quick installation of the mounting plate 2. When the trapezoidal shell 1 and the mounting plate 2 are in contact with each other, the sealing ring 5071 is sandwiched between the two to achieve a sealing treatment. At the same time, the locking plate 506 is inserted into the mounting slot 501, and the rotating screw 502 drives the locking plate 503 to slide, so that the locking plate 503 is locked into the locking plate 506. In this way, when installing the wall washer light, it is convenient for subsequent installation and replacement.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving anti-glare wall washer light housing, comprising a trapezoidal housing (1) and a mounting plate (2), characterized in that: The trapezoidal shell (1) is rotatably connected to the inner side of the mounting box (3), the inner side of the trapezoidal shell (1) is provided with an adjustment mechanism (4), the top of the mounting plate (2) is provided with an installation mechanism (5), the top of the mounting plate (2) is provided with a fixing mechanism (6), the inner side of the mounting box (3) is provided with a lighting mechanism (7), the inner side of the mounting box (3) is provided with a light-transmitting mechanism (8), and the rear side of the trapezoidal shell (1) is provided with a sealing mechanism (9). The adjustment mechanism (4) includes a rotating shaft (401), which is fixedly connected to the left side of the mounting box (3). A hollow shaft (402) is fixedly connected to the right side of the mounting box (3). The right end of the hollow shaft (402) is rotatably connected to the right side of the trapezoidal shell (1). A toothed ring (403) is fixedly connected to the right side of the trapezoidal shell (1). A magnetic column (404) is slidably connected to the right end of the hollow shaft (402). Two limiting blocks (405) are fixedly connected to the left end of the outer wall of the magnetic column (404). A toothed shell (406) is fixedly connected to the outer wall of the magnetic column (404).

2. The housing of an energy-saving anti-glare wall washer according to claim 1, characterized in that: The mounting mechanism (5) includes two mounting slots (501), which are located at the top left and right ends of the mounting plate (2). Limiting plates (504) are fixedly connected to the inner sides of the two mounting slots (501). Limiting grooves (505) are opened on the adjacent sides of the two limiting plates (504). A retaining plate (503) is slidably connected to the inner side of the two limiting grooves (505). A screw (502) is rotatably connected to the inner side of the two mounting slots (501). The adjacent sides of the retaining plates (503) are threaded to the outer wall of the screw (502). A locking plate (506) is fixedly connected to the bottom left and right ends of the trapezoidal shell (1). A fitting component (507) is provided on the top of the mounting plate (2).

3. The housing of an energy-saving anti-glare wall washer according to claim 2, characterized in that: The bonding assembly (507) includes a sealing ring (5071) which is fixedly connected to the top of the mounting plate (2).

4. The housing of an energy-saving anti-glare wall washer according to claim 1, characterized in that: The fixing mechanism (6) includes two screw holes (601), both of which are opened at the top left and right ends of the mounting plate (2), and bolts (602) are threaded onto the inner side of both screw holes (601).

5. The housing of an energy-saving anti-glare wall washer according to claim 1, characterized in that: The lighting mechanism (7) includes an aluminum substrate (701), which is fixedly connected to the bottom inner side of the mounting box (3), and a plurality of lamp beads (702) are fixedly connected to the top of the aluminum substrate (701).

6. The housing of an energy-saving anti-glare wall washer according to claim 1, characterized in that: The light-transmitting mechanism (8) includes two mounting slots (801), both of which are located on the front and rear sides of the interior of the mounting box (3), and a lens (802) is fixedly connected between the two mounting slots (801).

7. The housing of an energy-saving anti-glare wall washer according to claim 1, characterized in that: The sealing mechanism (9) includes two through holes (901), both of which are located on the rear side of the trapezoidal shell (1), and rubber sealing blocks (902) are fixedly connected to the inner side of each of the two through holes (901).

8. The housing of an energy-saving anti-glare wall washer according to claim 1, characterized in that: The bottom left and right ends of the mounting box (3) are fixedly connected with connecting wires (10), and the front and rear sides of the trapezoidal shell (1) are provided with multiple drainage holes (11).