The key to LED lamp quality is heat dissipation

Whether the LED lamp is stable or not, the quality of the LED lamp is very important to the heat dissipation of the lamp body itself. At present, the heat dissipation of high-brightness LED lamps on the market usually adopts natural heat dissipation, and the effect is not ideal. The heat dissipation is not ideal, and the life of the lamp itself will also be affected. The application of heat dissipation materials in the industry should not only focus on the heat dissipation coefficient, but ignore the thermal resistance value. If you only see that the heat dissipation coefficient of a certain heat dissipation patch, heat dissipation paste, heat dissipation paint or heat transfer adhesive film is very good, you think that high heat conduction can be carried out, which may be disappointing. It is expected that the temperature will drop, the LED epitaxial will not fade due to overheating, the life of the street lamp can be effectively extended, and the acceptance will pass smoothly. Etching tin from the substrate circuit, coating LED backlight ink, coating protective adhesive film into the oven for baking, leveling the whole plate, pasting thermal adhesive film, and then combining the heat dissipation module with adhesive glue or lock, in this complicated process, it can be found that materials with better thermal conductivity will also be defeated by thermal resistance. Air, untight pores at the junction, heat dissipation gaskets, powders formed after volatilization of heat dissipation paste Silicon oil, and film thickness of multilayer heat transfer adhesive films will all form thermal impedance. These multi-level thermal resistance will hinder the heat conduction rate, and the heat conduction is very slow, even if it does not reach the surface layer of the lamp, the heat will accumulate and increase. The white backlight ink on the surface of the aluminum substrate should not only reflect, but also spread the heat of the lower layer through the backlight ink on the surface. Some manufacturers do not observe that the general white text ink replaces the LED-specific backlight ink, which is equivalent to adding a layer of hard paint to seal the heat. After many failures, some manufacturers have accepted new concepts and processes, focusing on the overall heat dissipation scheme. The aluminum substrate is coated with a heat-dissipating white backlight ink for LED. If a yellowish backlight ink is specified, the reflectivity will be enhanced to 91. Spraying soft ceramic heat dissipation paint between copper foil substrate and aluminum substrate can reduce the usage of Japanese thermal conductive adhesive film and improve breakdown voltage at extremely low cost. To protect the lamps from the erosion of the climate environment, the heat is effectively transmitted out, and the effective way to save money is to spray soft ceramic heat dissipation paint. Only starting from the overall concept of heat dissipation and reducing thermal resistance interference is the key to the acceptance of large LED lamps. The lamp protection Shell should abandon the traditional electroplating or baking varnish, which will seal the heat back into the lamp.