Sunlite 30322-SU F21T5/850 21W Fluorescent T5 Bulb, Mini Bi-Pin, Super White

The fluorescent 21 watt 5,000k super white t5 high performance straight tube features a mini bi-pin base, provides a light output of 1,900 lumens at a color rendering index (cri) of 82 and can last an average of 20,000 hours. these lamp utilize a single and double coat phosphor system. series lamps have an increased cri due to the use of tri-phosphors (rare earth phosphors). tri-phosphors also increase the lumens/watt output of the lamp. these series lamps offer superior quality of lighting, increased energy efficiencies, and extend life.