GE 26317 - 250 Watt - ED28 - PulseArc Multi-Vapor - Pulse Start - Metal Halide - Unprotected Arc Tube - 4200K - Mogul Base - ANSI M138 or M153 - Vertical Burn - MVR250/VBU/PA 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 ED28 bulb, 250W, Base: E39 Mogul Screw, Rated Life (hours): 15000, Color Temp: 4200K, Luminous Flux (LM):