Advance HID Ballast, Magnetic, Metal Halide Lamp, 1500 W Lamp, 1610 W Wattage, 480 VAC, 3.43 A, 60 Hz Frequency, Probe Start, -20 deg F Minimum Starting, Power Factor: 0.9, No Dimmable, 1 Lamp, Thermal Protection: Class P, 71A6742A Lamp Base, Ballast Factor: 1, ANSI M48 Ballast Grade, 6 in L x 6.7 in W x 4.25 in H Dimensions