This state-of-the-art digital fixture will run both 250 and 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.