Ge 46705 f28w/t5/835/eco, 28w, 3500k, 2900 lumens, 85 cri ge fluorescent lamps have become a universal standard in office and other lighting applications. Fluorescent lamps have low operating costs because they’re efficient, long living, high quality, and rapid starting. They cost significantly less to operate over their lifetime than incandescent lamps. Ge star lamps offer higher color rendering and lumen maintenance of 92%-95%. Also, rapid start and instant start lamps typically start within 1 second of being turned on. Lamp life is approximately 35% longer @ 3 hours per start and 20% longer @ 12 hours per start on programmed start ballasts as compared to standard instant start ballasts. features: color/finish: cool white color temperature: 3500k average lifetime: 36000 hours lumens (light output): 2900 cri: 85