The Sun System? 1 LEC brand technology 315 ballast is optimized for cutting edge Light Emitting Ceramic? brand technology which 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 volt and has a rated life of 50,000 hours. 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 foot Etelligent signal wire and a hard wired 6 foot 277 volt power cord with a L7-15p twist lock plug is 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 US testing lab in a true as used configuration.