The Vertizontal Reflector® combines the traditional features of a vertical and horizontal reflector into one exceptional reflector. Brushed aluminum backing and white internal panels features a highly reflective aluminum insert for increased optical efficiency and performance. Reflector dimensions: 48 inch diameter by 10 inch deep. This reflector operates both metal halide (MH) and high pressure sodium (HPS) lamps in the horizontal position of this eight-sided parabolic reflector. Pre-wired with lamp cord and adjustable socket. Does not accept BT56 lamp.