GE 23974 - HR400A33 Mercury Vapor Light Bulb,GE,043168239745" /> HID Bulbs produce high output for their size making them a compact powerful &amp; 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 GE ED37 bulb, 400W, Base: E39 Mogul Screw, Rated Life (hours): 24000, Color Temp: 5700K, Luminous Flux (LM):