Sylvania 400W BT37 M59/S E39 Mogul MS400/C/BU-ONLY Metal Halide Light Bulb

HID Bulbs produce high output for their size making them a compact powerful & efficient light source.HID Bulbs are used for general lighting, professional lighting fixtures, growing applications.HID bulbs put out around 3-5 times greater output (lumens per watt) than traditional halogen bulbs.Osram Sylvania BT37 bulb, 400W,.Base: E39 Mogul Screw, Rated Life (hours): 20000, Color Temp: 3600K, Luminous Flux (LM): 42000