Patent ID: 8585250

Claim:
An optical semiconductor lighting apparatus comprising: a housing; a light emitting module including at least one or more semiconductor optical devices and disposed at an outer side of a bottom surface of the housing; a heat sink unit disposed radially at an inner side of the bottom surface of the housing and forming a communication space at a central portion of the inner side of the bottom surface of the housing; a first heat sinking path formed radially from the central portion of the inner side of the bottom surface of the housing; and a second heat sinking path formed along an edge of the bottom surface of the housing in a vertical direction, wherein the heat sink unit comprises a pair of heat sink sheets facing each other, a plurality of unit heat sink elements forming the first heat sinking path are disposed between the adjacent heat sink sheets, the housing further comprises a plurality of lower vent slots penetrating the bottom surface of the housing along an edge of the light emitting module, and the lower vent slots communicate with the second heat sinking path.