Sunlights Galaxy Electronic remote ballast and 21"x11.5"x6.75" Super Sun Horizontal reflector, lined with a 95% reflective aluminum insert for high luminescence, and louvered on both sides. Optional tempered glass lens and 4 inch air cool fittings. Sunlight electronic remote ballast features an extruded aluminum housing that will never rust and has excellent heat dispensation qualities. Extremely efficient - 99% power factor and saves energy compared to HID ballast systems. Electronic ballasts will operate eith HPS or Metal Halide lamps and are voltage specific, Choose a 400W 120V-240V, 600W 120V-240V, 1000W 120V, and 1000W 240V lighting system. 3-year full and 2-year prorated rebuild or replace warranty.