GE 23729 - 350 Watt - ED37 - PulseArc Multi-Vapor - Pulse Start - Metal Halide - ANSI M131 - 4000K - 65 CRI - 20,000 Life Hours - Mogul Base - MVR350/BVU/XHO/PA/E 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, 350W, Base: E39 Mogul Screw, Rated Life (hours): 20000, Color Temp: 4000K, Luminous Flux (LM):