It is reported that when the LED chip is working, 30-35 electric energy is converted into light energy, and another 65-70 is converted into heat energy. Led is very sensitive to temperature effects. In general, LEDs can avoid performance degradation or even failure at junction temperatures below 125 degrees Celsius. 70% of the failures are caused by the LED temperature being too high, and the failure rate doubles for every 20 degrees Celsius increase in temperature at half the rated power.
Heat Transfer LED lamps have three basic components for heat transfer, from chip to epitaxy, to the package substrate, to the heat sink or to the chassis. At present, the LED cooling technology problem is that the LED node is limited by temperature. Under normal circumstances, the maximum temperature is 125 degrees Celsius; the design value is 90 degrees Celsius, and the ambient air temperature difference is only 55 degrees Celsius.
LED heat dissipation and LED heat dissipation can not use the fan but the natural convection heat dissipation method, not to mention the LED heat dissipation design must also meet the optical requirements of LED lighting. In addition, the LED heat dissipation design must also meet the lighting modeling needs, so that there is a better selling point, and the lighting design limits the heat dissipation design.
If the optical efficiency is reduced in order to disperse the arrangement of the heat-dissipating light source, this is not worth the loss. The heat dissipation cost of the LED is very high. The size and weight limit of the LED lighting fixture cannot fill a large amount of high thermal conductivity heat-conducting material, and the thermal conductive material includes : High thermal conductivity silicone film, thermal grease , solder, phase change material, etc.; among them, thermal conductive silicone sheet, high thermal conductivity silicone gasket is the most cost-effective, thermal conductivity material is preferred.
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