How to manage the thermal in LED

  High-power LED lights have huge metal radiators, and the heat emitted by them is conducted to the metal radiators, and then transferred to the air through natural convection and radiation.

  Under the condition of natural convection without the influence of external wind, the influence of heat radiation is not negligible. In order to enhance the heat dissipation effect, generally start from two aspects: one is to increase the surface area of the radiator to enhance the effect of natural convection; the other is to increase the infrared emissivity of the radiator surface through some surface treatments, such as anodizing, to achieve enhanced radiation Effect. It should be pointed out that an often misunderstood knowledge is to blacken the radiator to enhance heat dissipation. Since the temperature on the surface of the radiator is not high, at most hundreds of degrees, the wavelength of the emitted energy is very long, which belongs to the infrared waveband. Infrared is not the same as visible light. It is not sensitive to colors, so simply different colors will not bring about changes in the emissivity of the infrared spectrum. Then why are many heat sinks treated as black? This black color is not painted, but the result of anodizing. After anodizing, an oxide film will be formed on the surface of the metal. This oxide film has non-metallic properties and is non-conductive. Its emissivity is It is significantly higher than the metal surface, so the heat radiation treatment of the heat sink after such treatment is enhanced.