Philips Mercury Vapor Lamp, HID, H33GL-400/DX Full CT 6PK Designation, 400 W Wattage, 366 V AC, 3 A, E39 Lamp Base, ED37 Shape, 23000 Lumens, 24000 hr Average Life, Cool White, 90 CRI, 3700 K Color Temperature, Coated Lamp, H33 Ballast, 122 mm W x 290 mm H Dimensions