Source Four HID gives you the level of performance of a 2,000-hour Source Four fixture but with 10,000 additional hours. The metal-halide fixture features all of the Source Four's famous cool beam, imaging, pattern projection, and bright, even field. Source Four HID uses an electronic ballast with a power factor of greater than 95% compared to some competitors' ballasts at less than 70%. And HID's ballast has an efficiency of greater than 90%. With its 1.5 amps operating current, you can safely place more Source Four HIDs on a 20A circuit than you can other manufacturers' units that operate at 2.3 amps. Plus, Source Four HIDs are UL Listed for damp locations.