This state of the art digital fixture will run both 250 & 400 watt lamps. The integrated electronic ballast allows operation of both metal halide (MH) and high pressure sodium (HPS) lamps. The proprietary Smart Volt? ballast operates at 120 – 240 volts (120 volt cord included). Lightweight (only 15 lbs) and easy to set up. Highly reflective aluminum insert. On/Off switch. Powder-coated steel housing is attractive and durable. Purchase your choice of lamp separately.