Sunlite 30427-SU F39T5/850/HO 39W Fluorescent T5 Mini Bi-Pin Bulb, Super White

30427-su f39t5/850/ho 39w fluorescent t5 mini bi-pin bulb, super white the fluorescent 39 watt 5,000k super white t5 high output high performance straight tube features a mini bi-pin base, provides a light output of 3,100 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.