GE f32t8/xl/spx35hleco, 4', 32w, t8, 1" diameter, ecolux linear fluorescent bulb, medium bi pin ends, 3,100 lumens, rated life: 36,000 hours @ 12 hours per start, 3,500 kelvins, cri=85, higher lumen output than standard 32w 4' lamps, ease of disposal.