Luxrite LR20785 (4-Pack) F39T5/841/HO 39-Watt 3 FT T5 High Output Fluorescent Tube Light Bulb, Cool White 4100K, 2925 Lumens, G5 Mini Bi-Pin Base Color/Finish: Cool White Color Temperature: 4,100K Average Lifetime: 20,000 hours Lumens (light output): 2925 G5 mini bi-pin base