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Generally known as LED cold light source, because LED light emitting principle is the electron directly through the composite photon, without the need for thermal process. However, due to the presence of Joule heat, LED in the light also accompanied by heat, but also for high power and multiple LED applications, Light source, high temperature will shorten, or even terminate its service life. And the LED is a temperature-sensitive devices, when the temperature rises, its efficiency dropped dramatically, so the system structure design and cooling technology development is also the subject of LED applications to be faced. As forced air cooling is usually not desirable in light sources, heat sinks and other methods of enhancing natural convection cooling play an increasingly important role in the design of LED lamps and light sources as input electrical power is increased.