The Source Four HID ellipsoidal luminaire has many features and accessories including: a die-cast aluminum housing; 20-gauge stainless-steel shutters in a tri-plane assembly; high-impact-resistant thermally insulated knobs and shutter handles; a steel yoke; a fixed 5-degree angle lens barrel; and anti-vibration shock mounts. The fixture, which comes standard in a black or a white finish, uses an integral electronic ballast and 150W ceramic metal halide lamps.