Airtight and IC-rated recessed light housing

An IC-rated airtight luminaire, comprising:

• a housing divided on a vertical plane to form a first housing portion and a second housing portion, said first and second housing portions releasably coupled to one another to form an open cylindrical lower portion, a heat sink upper housing portion, and a heat conducting lamp assembly adjustment track enclosed within said housing and including first and second planar heat sink walls disposed in said first and second housing portions, respectively;
• a lamp assembly slidably coupled to said lamp assembly adjustment track, said lamp assembly including a heat conducting slide bar slidably captured between said first and second planar heat sink walls, a lamp holder, and a lens which directs a beam of light through an opening in a wall or ceiling substrate in which said housing is installed;
• and
• an expansion ring rotatingly disposed around said open cylindrical lower portion, wherein said expansion ring engages and secures said housing in a wall or ceiling substrate while also permitting said housing to freely turn within said expansion ring so as to allow adjustment of a beam of light directed from said lamp assembly.