High Intensity Discharge (HID) Lamp, Metal Halide Lamp Type, 400 Watts, ED37 Lamp Shape, M59 ANSI Number, Lamp Designation MH400/U/M59/E, Mounting Position VBU, Clear, For Use With Enclosed Fixtures, 12K Average Life (Hours), Max. Overall Length 11 1/2 In., 36,000 Initial Lumens, 4200 Color Temp., 65 CRI, Case Quantity 6, E39 Base, 28,800 Mean Lumens, Light Center Length 7.00 In.