The Fulham Workhorse WHSG2-UNV-T8-IS is a 120 - 277v, 1 or 2 light instant start electronic fluorescent ballast. It operates the lamps inparallel that makes a good replacement for magnetic ballasts. The WHSG2-UNV-T8-IS for (1) F17T8, F25T8, F32T8, F40T8, FB031T8, F32T8/28, F32T8/25 or (2) F17T8, F25T8, F32T8, FB031T8, F32T8/30, F32T8/28, F32T8/25.