Advance HID Ballast, Magnetic, Metal Halide Lamp, 400 W Lamp, 452 W Wattage, 120/208/240/277 VAC, 3.8/2.2/1.9/1.65 A, 60 Hz Frequency, Pulse Start, -20 deg F Minimum Starting, Power Factor: 0.9, No Dimmable, 1 Lamp, Thermal Protection: Class P, 71A6092AEE Lamp Base, Ballast Factor: 1, ANSI M135/M155 Ballast Grade, 4.75 in L x 4.1 in W x 4.25 in H Dimensions