GE 47326 - 1500 Watt - BT56 - SportStar Multi-Vapor - Metal Halide - Unprotected Arc Tube - 4000K - ANSI M48 - Universal Burn - VR1500/U/SPORTS 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 BT56 bulb, 1500W, Base: E39 Mogul Screw, Rated Life (hours): , Color Temp: 4000K, Luminous Flux (LM):