... , lockable rotating end cap 4, Isolated driver high lumen led light 1, Ervan LED Tube is designed to replace the traditional lamps. ... , no mercury.3, Long lifespan: >50,000hrs4, High brightness, adopts high quality LED chip with about 24mA current.Very strict testing steps ... final explantion of aforesaid terms.Tubes in refrigerators high lumen led light with Double side pc lens certified by TUV