LED lamp with a heat dissipation device

摘要

An LED lamp includes a first heat sink, a second heat sink attached to the first heat sink and a LED module thermally attached on the second heat sink. The first heat sink includes a substrate and a plurality of first fins arranged on the substrate. A plurality of channels are defined between the first fins of the first heat sink. A plurality of traverse grooves are extended through all of the first fins and the channels between the first fins. The grooves are spaced from each other a distance along a lengthwise direction of the first heat sink. The channels are divided into a plurality of parts separated from each other by the grooves. The channels and grooves of the first heat sink increase contact area of the first heat sink and air surrounding the first heat sink.