Sunlights Galaxy Electronic remote ballast and 19.75"Lx18"Wx6.25"H Yield Master 4 inch Horizontal reflector. 95% reflective German aluminum interior for maximum light output and uniformity. Optional tempered glass lens and 4 inch air cool fittings. Lamp cord and socket are built into the reflector. UL Listed for HPS and for Metal Halide with tempered glass lens. Future Brite 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 full and 2-year prorated rebuild or replace warranty.