Do you want to get into an electronic ballast at a great price? Then you should consider this economical, 600 watt, Welthink electronic ballast. You still get all the benefits of an electronic ballast: up to 11% more efficient, and drives different wattages and types of HID lamps, and uses either 120V or 240v power sources. The Welthink will operate 600 watt metal halide or high pressure sodium lamp. Runs on 120V or 240V, includes 120V power cord and a 3 year warranty.