High Intensity Discharge (HID) Lamp, Metal Halide, 20 Watts, T4-1/2 Lamp Shape, ANSI Number C156/M156, Lamp Designation CMH20/TC/U/830/G8.5, U Operating Position, Universal Mounting Position, Description/Special Features Clear, UV Control, For Use With Enclosed Fixtures, Average Life 12K hr., Max. Overall Length 3-3/8 In., 1650 Initial Lumens, 3000 Color Temp., 81 CRI, Bipin G8.5 Base, Enclosed Fixture Type, 1090 Mean Lumens, Light Center Length 2 In.