What is the technical principle of LED wall washer?

In recent years, LED wall washer has been widely used in various places, such as the wall lighting of company and corporate buildings, the lighting of government buildings, the wall lighting of historical buildings, entertainment venues, etc.; the range involved is also increasing Wider. From the original indoor to the outdoor, from the original partial lighting to the current overall lighting, it is the improvement and development of the level. As the times progress, LED wall washers will develop into an indispensable part of the lighting project.

1. The basic parameters of high-power LED wall washer

1.1. voltage

The voltage of LED wall washer can be subdivided into: 220V, 110V, 36V, 24V, 12V, several kinds, so we pay attention to the corresponding voltage when choosing the power supply.

1.2. protection level

This is an important parameter of the wall washer, and it is also an important indicator that affects the quality of the current guardrail tube. We have to make strict requirements. When we use it outdoors, it is best to require the waterproof level to be above IP65. It is also required to have the relevant pressure resistance, chipping resistance, high and low temperature resistance, flame resistance, impact resistance and aging grade IP65, 6 means completely preventing dust from entering; 5 means: washing with water without any harm.

1.3. working temperature

Because wall washers are usually used outdoors more, this parameter is more important, and the requirements for temperature are relatively high. Generally, we require outdoor temperature at -40℃+60, which can work. But the wall washer is made of aluminum shell with better heat dissipation, so this requirement can be met by the general wall washer.

1.4 light-emitting angle

The light-emitting angle is generally narrow (about 20 degrees), medium (about 50 degrees), and wide (about 120 degrees). At present, the farthest effective projection distance of high-power led wall washer (narrow angle) is 20- 50 meters

1.5. Number of LED lamp beads

The number of LEDs for the universal wall washer is 9/300mm, 18/600mm, 27/900mm, 36/1000mm, 36/1200mm.

1.6. color specifications

2 segments, 6 segments, 4 segments, 8 segments full color, colorful color, red, yellow, green, blue, purple, white and other colors

1.7. mirror

glass reflective lens, light transmittance is 98-98%, not easy to fog, can resist UV radiation

1.8. Control method

There are currently two control methods for LED wall washer: internal control and external control. Internal control means that no external controller is needed. The designer designs the control system in the wall lamp, and the degree of effect cannot be changed. The external control is an external controller, and its effect can be changed by adjusting the buttons of the main control. Usually in large-scale projects, customers can change the effect on their own requirements, and we all use external control solutions. There are also many wall washers that directly support DMX512 control systems.

1.9. light source

Generally, 1W and 3W LEDs are used as light sources. However, due to the immature technology, it is more common to use 1W in the market at present, because 3W generates a large amount of heat, and the light decays faster when the heat is deleted. The above parameters must be considered when we choose LED high-power wall washer. In order to distribute the light emitted by the LED tube for the second time to reduce light loss and make the illuminance better, each LED tube of the wall washer will have a High-efficiency lens made of PMMA.

2. The working principle of LED wall washer

The LED wall washer is relatively large in size and better in terms of heat dissipation, so the difficulty in design is greatly reduced, but in practical applications, it will also appear that the constant current drive is not very good, and there are many damages. So how to make the wall washer work better, the focus is on control and drive, control and drive, and then we will take everyone to learn.

2.1. LED constant current device

When it comes to LED high-power products, we will all mention constant current drive. What is LED constant current drive? Regardless of the size of the load, the circuit that keeps the current of the LED constant is called LED constant current drive. If a 1W LED is used in the wall washer, we usually use a 350MA LED constant current drive. The purpose of using the LED constant current drive is to improve the life and light attenuation of the LED. The choice of constant current source is based on its efficiency and stability. I try to choose a constant current source with high efficiency as much as possible, which can reduce energy loss and temperature.

2.2. the application of led wall washer

Main application occasions and achievable effects of the wall washer LED wall washer is controlled by the built-in microchip. In small engineering applications, it can be used without a controller, and can achieve gradual change, jump, color flashing, random flashing, and gradual change. Dynamic effects such as alternation can also be controlled by DMX to achieve effects such as chasing and scanning.

2.3. Application place

Application: Single building, exterior wall lighting of historical buildings. In the building, the light is transmitted from the outside and the indoor local lighting. Green landscape lighting, LED wall washer and billboard lighting. Specialized lighting for medical and cultural facilities. Atmosphere lighting in entertainment places such as bars, dance halls, etc.

Post time: Nov-10-2020