SYLVANIA 64448-250 Watt - BT28 - SUPER METALARC - Metal Halide - Unprotected Arc Tube - 4200K - ANSI M58/E - Horizontal Burn - MS250/HOR Color/Finish: Clear Color Temperature: 4,200K Average Lifetime: 10000 hours Lumens (light output): 23000 CRI: 65