The Galaxy? LEC brand technology 315 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 Galaxy? LEC brand technology 315 ballast operates at 120-240 Volt or 277 Volt and offers a rated life of 50,000 hours. Galaxy? 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 comes pre-wired with a lamp cord receptacle that is compatible with all Sun System? LEC? brand reflectors. Smart Volt? brand technology allows ballast operation 120 ? 240 V. 906270 includes a 6 foot 120 volt power cord. Purchase a 208/240 volt power cord separately (#903082). 906272 features a hard-wired 6 foot 277 volt power cord with a L7-15p twist lock plug.