Energy Focus Redcap LED T8 Battery Backup Lamp, 5000K, 11W, 4ft, Direct Wire, Single-Ended Power (Case of 15)

Really easy to install, on existing 4 feet fixtures.Not comparable with all fixtures some socketse are made for specifically for some brands you may have to buy whole fixture and make your own emergency light

the EF redcap T8 made a horrible buzzing sound. it may say flicker free, but the buzz sound was quite a distraction. I bought from another online seller, but the LED company would not stand behind the warranty when i called their Solon offices. I would not recommend.

Arrived defective was told if I wanted to return item I needed to pay for return shipping.