Cool Sun 1 grow light features the Sun System I Premium, aluminum heat sync remote ballast and 24"x20.5"x7.5" horizontal reflector with 95% reflective aluminum interior, integrated 6 inch air cool fittings and tempered glass lens. The ultimate combination of cooling and peformance, air passes easily through both ends of the reflector directly over the lamp for maximum inline air cooling. Cool Sun accepts all size Metal Halide (except BT56) and HPS lamps. 5-year rebuilt or replace warranty.