Philips Quartz Metal Halide Lamp, Standard, MH400/U 6PK, 400 W, 135 VAC, 3.25 A, ED37 Lamp, E39 Mogul Single Contact Lamp Base, Elliptical/Dimple, 25350 Mean Lumens, 20000 hr Average Life, Cool White, 65 CRI, 3900 K Color, Clear Lamp, Switch Start, M59/E Ballast, Enclosed Fixture, 4-5/8 in Dia x 11-1/2 in L
Hard glass bulb material52 mg mercury contentBulb temperature (maximum): 400 deg CCap-base temperature (maximum): 210 deg C12 min re-ignition time97.5 lm/W luminous efficacyUniversal position