Recessed Canopy luminaire for HID lamp, totally enclosed. Reflector is specular aluminum. Housing is seamless, die-cast aluminum. Includes four adjustable steel "L" brackets for mounting to various ceiling thicknesses and four hold down clips to prevent fixture movement during trim installation. Rough-in 12.3" (311mm) sq. hole required for fixture installation. Large wiring compartment with access from above or below the ceiling line, for ease of field wiring. UL rated for four (2 in - 2 out) #12AWG (90 degrees C) through-branch circuit conductors. HID fixtures are provided with a UL listed insulation detector, which will deactivate fixture if inadvertently covered with insulation. Lens assembly consists of rigid aluminum frame and high-impact, #73 crystal tempered glass.