Cooling-Performance Estimation of the Composite-Graphite Heat Sink with Annular Conductive Base for LED Lamp

This work experimentally investigated the material effect of heat sinks of LED lamps on the heat transfer and illumination characteristics under the free-convection condition. The experimental results indicated that the heat-transfer capacity of the pure aluminum-alloy heat sink was better than those of the composite-graphite heat sinks. However, the cost and weight of the composite-graphite heat sinks were reduced much more by comparing with those of the pure aluminum-alloy heat sink. Besides, the illuminations of these test heat sinks were similar after 2000-hour lighting continuously. Therefore, the composite-graphite heat sink is useful for the cooling of the LED lamp and the electric equipment. It has large potential in the relevant markets.