Sunlite 30020-su f30t12/cw 30w fluorescent t12 bulb, medium bi-pin, cool white the fluorescent 30 watt 4,100k cool white t12 straight tube features a medium bi-pin base, provides a light output of 2,050 lumens at a color rendering index (cri) of 62 and can last an average of 8,000 hours.