Fluorescent/CFL Bulbs

Feit linear and U-bend fluorescent tubes in T5, T8 and T12, from 13 W to 40 W. Tube diameter has to match the fixture and the ballast — T8 is 1 in., T12 is 1-1/2 in., and a T8 lamp will not run properly on a T12 ballast. Length matters as much as wattage: a 32 W T8 is about 48 in. and an 18 W T8 is about 24 in., so measure the old tube. Color temperature runs 3000 K warm white, 4100 K cool white and 6500 K daylight, and mixing them in one room shows the moment the lights come on.