The Sun System? 1 LEC? brand technology 630 watt ballast is optimized for cutting-edge Light Emitting Ceramic? brand technology. This ballast has a thermally optimized non-fan cooled aluminum housing while operating on 50/60 Hz low frequency, square wave which makes this electronic ballast highly efficient. The Sun System? 1 LEC? brand technology 630 ballast operates at 277 volt, which has a rated life of 50,000 hours. Sun System? 1 LEC? brand technology 630 watt dimmable ballast operates two 315 watt ceramic metal halide lamp, ANSI: C182, at 50%, 60%, 70%, 80%, 90% and 100%. This ballast includes two prewired lamp cord receptacles that is compatible with all Sun System? LEC? brand reflectors. The Sun System? 1 LEC? features controller-compatible signal ports for on/off/dimming functions as well as an ambient thermal temperature probe. The Sun System? 1 Etelligent Controller Kit #902245, (sold separately), allows up to 400 Sun System? 1 ballasts to be daisy-chained together. This controller allows for wired control of the on/off/dimming capabilities of Sun System?1 ballasts. Includes a hard wired 8 foot 277 volt power cord with a L7-15p twist lock plug as well as a 15 ft Etelligent signal wire.