Philips Metal Halide Lamp, MS250/U/PS Designation, 250 W Wattage, 133 V AC, HID Lamp, E39 Lamp Base, ED28 Shape, 15400 Lumens, 12000 hr Average Life, Neutral White, 62 CRI, 3000 K Color Temperature, Clear Lamp, Pulse Start, M138/M153/E Ballast, Enclosed Fixture, 3.5 in Dia x 8.31 in L Dimensions