USA, Canada – High Frequency Electronic Ballast for 4 or 3 Lamps (F32T8, F32T8ES, F32T8ES-25W, F28T8), 4 Lamps (F25T8, F17T8, F25T12), and 3 Lamps F40T8 (Also equivalent U-shaped lamps), Line Voltage: 108Vac to 305Vac, 50/60Hz, Instant Start, Parallel Lamp Operation, UL Listed, CSA Certified