sansi 250w equivalent a21 led light bulb, 4000 lumens e26 led bulb with ceramic technology, 5000k daylight non-dimmable, 25,000-hour lifetime, efficient, safe, 2 pack 27w energy saving for home garage sansi <b>long lifetime and 5 years warranty: </b><br> long lifespan: 25,000 hours vs 1,000 hours ( for cfl bulbs)</b> <br>5-year warranty: you can sure buy with confidence, any problems please feel free to contact us.<br><br> <b>wide applications: </b><br> a21 shape with e26 base, easy to install<br> ideal for home, kitchen, garage, warehouse, basement, mall, barn, office, school, hospital, shopping mall, workshop, logistic center, stadium, hotel, church, studio, gym etc.<br><br> <b>pleasant on your eyes:</b><br> flicker-free and instant-on lighting for eye care<br>natural daylight 5000k to give off a bright quality light without harsh glares<br> cri 80+ to provide true color temperature experience<br><br> <b>customer notice:</b><br> 1. please turn off power before installing or changing assembly parts.<br> 2. ideal for both indoor and protected outdoor fixtures.<br> 3. forbidden to use in enclosed fixtures.<br><br> <b>sansi advantages--</b>patented ceramic heat dissipation technology(chdt)<br> sansi ceramic leds vs aluminum leds<br> dissipates heat more efficiently: unlike other leds, whose chips must be molded on a pc board with a thermal adhesive, sansi leds save this by molding chips directly on the ceramic. fewer pieces mean better cooling efficiency, thus better heat dissipation.<br> more corrosive-resistant: ceramic deals with moisture and air pollution better than aluminum<br><br> <b>about sansi</b><br> sansi was founded in 1993 in shanghai, the idea of a retired director of research institute. he is dedicated to the high technology of led applications. now sansi has been a global leader in led lighting and displays with over 400 r&d engineers, 2000 employees, and three advanced factories. highest resolution screen in new york square and in verizon center, washington, d.c. made by sansi.<br>