Sunlights Galaxy Electronic remote ballast and 20.5L"x24W"x7.5H" CoolSun 95% reflective aluminum Horizontal reflector. Includes Tempered glass lens and 6 inch built-in 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 either 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 and 2-year prorated rebuild or replace warranty.