Patent ID: 8258681

Claim:
A heat dissipating device for lightings, comprising: a light source module, having at least one light source; a heat sink, connected to the light source module and having a substrate and a plurality of heat dissipating fins extending outward from the substrate, wherein the substrate has an outer curved surface, wherein a plurality of channels is formed between the heat dissipating fins, wherein bottoms, tops and outer sides of the channels are opened, wherein at least one of the heat dissipating fins has an inner edge disconnected from the substrate, wherein the channels respectively have a port formed at an inner side thereof; and a converter, having one end connected to the heat sink; wherein a gap is formed between the inner edge of the heat dissipating fins and the converter, and between the inner edge of the heat dissipating fins and the outer curved surface of the substrate alternatively, the gap defines a ring-shaped air passage, the air passage is communicated with the ports of the channels between the heat dissipating fins.