The Fulham Workhorse WHSG4-UNV-T8-IS is a 120 - 277v, 3 or 4 light instant start electronic fluorescent ballast. It operates the lamps in parallel that makes a good replacement for magnetic ballasts. The WHSG4-UNV-T8-IS for (3) F25T8, F32T8, FB028T8, FBO32T8, FB031T8, F32T8/28, ...