Patent ID: 8408759

Claim:
A luminaire for use as a recessed lighting fixture, the luminaire having a canister comprising: a. a cylindrical sidewall and a domed cover having an interior wall, the cylindrical sidewall enclosing an interior chamber and the domed cover enclosing the interior chamber under the domed cover, the domed cover including an opening in its top surface and a sealing cap removably affixed to the domed cover to enclose the opening, the sealing cap having a recessed interior surface which extends into the interior chamber under the domed cover; b. means for retaining a source of illumination within the canister; c. a first heat sink comprised of a multiplicity of spaced apart lower air fins which are separated by air gaps, the multiplicity of lower air fins supported within the interior chamber of the canister and extending radially inwardly from the interior sidewall; d. a second heat sink comprised of a multiplicity of upper air fins separated by air gaps, the upper air fins extending interior from the interior wall of the domed cover; and e. the upper and lower heat sinks causing air to circulate within the canister and through the air gaps separating the upper air fins and the lower air fins to thereby dissipate heat generated from the source of illumination.