LED wall washers let the lights wash over the wall like water. They are also used for building decoration lighting, as well as for the induction of large buildings. Because LED has the characteristics of energy saving, high luminous efficiency, rich color and long life, in 2013, the wall washers of other light sources were gradually replaced by LED wall washers.
Whether the LED lamp is stable, the quality is good or not, and the heat dissipation of the lamp body itself is important. At present, the heat dissipation of the high-brightness LED lamp on the market usually adopts natural heat dissipation, and the effect is not satisfactory. The heat dissipation is not ideal, and the life of the lamp itself will be affected. The application of heat dissipating materials in the industry should not only focus on the heat dissipation coefficient, but ignore the thermal resistance value. If you only see a certain heat sink, heat sink, heat sink or thermal film with a good heat dissipation coefficient, you can think that you can conduct high heat out, which may be disappointing. It is expected that the temperature will drop, the LED epitaxial will not be light-degraded due to overheating, the life of the LED street lamp can be effectively extended, and the acceptance can be smoothly passed, which may not occur.
In this cumbersome process, it can be found that a material with better thermal conductivity is also defeated by the thermal resistance impedance. The air, the non-closed pores of the joint, the heat-dissipating gasket, the powder formed by the evaporation of the heat-dissipating oil, and the film thickness of the multi-layer thermal conductive film all form a thermal impedance. These multiple levels of thermal resistance can impede the rate of heat conduction, heat conduction is very slow, and even the surface of the led lamp is not transmitted, and the heat is continuously accumulated. The white backlight ink on the surface of the aluminum substrate should not only be reflective, but also can disperse the heat of the lower layer through the backlight of the surface.