The electronic fluorescent ballast is intended for use with two (2) F32T8 fluorescent lamps. This instant start ballast can operate at 120/277 input volts and has a normal ballast factor of 0.89. It is UL listed and is approved by the NEMA Premium Electronic Ballast program, verifying that it is one of the most efficient T8 fluorescent ballasts in the market. With a low profile design, this ballast can be used in any residential or commercial application. This ballast comes with a 5-year warranty.