4 ft. Toggled [120-277VAC] Ultra High Output LED tubes (12-Pack) are designed to replace T8 and T12 fluorescent tubes to significantly lower energy [up to 70%] and maintenance costs while improving overall quality of light. Delivers best-in-class 4000 lumens per tube. Powered via direct-wire technology, they do not require the use of fluorescent ballasts which eliminates future ballast replacement costs as well as the associated buzz, noise and flicker.