GE, LED18ET8/4/840/U, 4' 18W, Cool White Light Color, White Bulb Color, T8 Shape, T8 LED Tube, Equivalent To A 32W Fluorescent, U-Shape, 6" Leg Space, Medium Bi Pin Base, 2,200 Lumens, 4,000 Kelvin Color Temperature, CRI = 80, 50,000 Hours Rated Life, MOL = 48", Dimmable If Used With Dimming Ballast/Driver. For use with approved electronic ballasts.