Illumalights  Supply's NEW 120V or 240V Electronic Ballast runs 400W HPS bulbs. Electronic ballasts operate using electronic circuitry offering several advantages over the traditional core & coil magnetic ballast. The power factor is 99% efficient offering substantial energy savings. Electronic ballasts offer constant wattage output with no flickering resulting in perfect illumination. The Illumalights Electronic Ballast also features soft starting which increases bulb life and reduces lumen depreciation. This 600W 120V Electronic ballast includes built-in axial fans for excellent cooling and silent operation. Other features include built in fuse protection, two built-in fuses, thermal overload protection and sleep mode function. illumalights electronic ballasts are light-weight .  This 400 watt electronic ballast runs on 120V or 240V .Includes a  reflector cord with socket assembly.