Luxrite LR20737 (4-Pack) F32T8/850 32-Watt 4 FT T8 Fluorescent Tube Light Bulb, Bright White 5000K, 2850 Lumens, G13 Medium Bi-Pin Base Color/Finish: Bright White Color Temperature: 5,000K Average Lifetime: 13,000 hours Lumens (light output): 2850 G13 medium bi-pin base