"This Designers Edge quad voltage lighting is designed for indoor installations where ceiling height is less than 15 feet. Quad voltage 120/208/240/277V features heavy-duty die-cast aluminum housing and energy-efficient pulse start ballast to provide higher output and whiter light. Bulb Base Type Mogul, Reflector Diameter in. 22, Dimensions L x W x H in. 24 x 24 x 24, Watts 400, Light Type Low Bay, Volts 120/208/240/277 Quad, Bulb Type Metal halide, Reflector Type Aluminum. Comes complete with hook and 400 Watt metal halide bulb UL/CUL listed"