The Sun System? 1 LEC? brand technology 315 ballast is optimized for cutting-edge Light Emitting Ceramic? brand technology that is Etelligent compatible. This ballast has a thermally optimized non-fan cooled aluminum housing while operating on 50/60Hz low frequency, square wave, which makes this electronic ballast highly efficient. The Sun System? 1 LEC? technology 315 ballast operates at 277 V and has a rated life of 50,000 hrs. Sun System? 1 LEC? brand technology 315 watt dimmable ballast operates a 315 watt ceramic metal halide lamp, ANSI: C182, at 50%, 60%, 70%, 80%, 90% & 100%. This ballast includes a prewired lamp cord receptacle 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 wired control of the on/off/dimming capabilities of Sun System?1 ballasts. A 15 ft Etelligent signal wire and a hard wired 6 ft 277 V power cord with a L7-15p twist lock plug are included. Compliant with both FCC Article 18 Part A (governs commercial use) and FCC Article 18 Part B (governs residential use) as tested by an independent U.S. testing lab in a "true as used" configuration.