HID High-Low Bay Fixtures: Fixture Type - Low Bay; Reflector Type - Open, Aluminum; Reflector Size - 18.00" (457mm) Diameter; Lamp - Metal Halide; Watts - 400; Voltage - Triple-Tap, 120/277/347V; Ballast Type - CWA; Mounting - Hook and Cord; Approx Wt - 32.0-lb (14.5-kg); Manufacturer Series - Ultrabay Lowbay