High Intensity Discharge (HID) Lamp, Metal Halide Lamp Type, 1000 Watts, BT37 Lamp Shape, M47 ANSI Number, Lamp Designation MH1000/U/M47/E/BT37, Mounting Position VBU, Clear, For Use With Enclosed Fixtures, 8,000 Average Life (Hours), Max. Overall Length 11 1/2 In., 105,000 Initial Lumens, 4200 Color Temp., 65 CRI, Case Quantity 6, E39 Base, 84,000 Mean Lumens, Light Center Length 7.00 In.