1-Pack Lights Talk super T8 LED Light Tube, 18W 2200lm(40W or Higher Equivalent), 5000K(Daylight), Work Without Ballast/AC/120~277V, 4ft, Single-Ended Power, Frosted, Glass, UL-Listed & DLC-Listed 5 years warranty. 50,000 hours life span, more than 27 years based on 5Hrs/day average Manufacturer direct sales! The manufacturer is the supplier of the top lighting brands in USA, so it is widely installed by hospitals, supermarkets, schools and hotels national wide. UL &amp; DLC listed. All 4FT and 2FT tubes are DLC-listed and thus eligible for State and Nationwide rebate programs. For your safety the products are UL-listed to avoid electrical risk Save more than 50% on your electricity bill! Replace 36W or 40W fluorescent tubes. High lumen output 2200lm. Leading efficacy 122 lumens per watt Ballast bypass required. Please use un-shunted tombstones to apply power to one end of tubes only.