12-Pack Ballast Compatible U Bent LED Tube, 12W 1800lm(32W or Higher Equivalent), 3500K(Cool White), Work With Electronic Ballast, Frosted, Glass, UL-Listed(12, 12W 3500K) Save more than 50% on your electricity bill! Replace 32 or higher fluorescent tubes. Leading efficacy 140 lumens per watt 5 years warranty. 50,000 hours life span, more than 27 years based on 5Hrs/day average UL listed. DLC qualified. 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. Ballast compatible or Plug-n-play, work with electronic ballast only. It can work with most of the electronic ballast