Ballast, Magnetic, Metal Halide Lamp, 150 W Lamp, 185 W, 120/208/240/277 V, 2.95/1.75/0.45/0.3 A, 60 Hz, Pulse Start, -30 deg C Minimum Starting, Power Factor: 0.9, Bracket, Clip Mount, 3-1/2 in L x 3.7 in W x 2-13/16 in H