Lumatek LK1000 Dual Voltage HPS-MH Dial A Watt Dimmable, 1000W-750W-600W This electronic multi watt ballasts give you the flexibility to run multiple size metal halides with more power transfer Better power transfer also means less energy is lost, saving money for you While it is on, you can dim the lamps up to 50 percent; cut off circuitry and lower heat output make it safer Requires sunlight supply lamp cord, reflector, socket assembly and lamps, all sold separately Measures 3-1/2-inch height by 6-inch width by 13-1/2-inch length; 5 Year limited manufacturer warranty