Abstract
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.
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