Universal Triad ballasts offer installer friendly universal input voltage, ensuring you have the right voltage ballast, and a low profile design, allowing for great space management. The Triad B232IUNVHP-N parallel instant start ballast operates (2/1) F32T8/F25T8/F17T8 lamp(s) at 120/277 volts. It is designed to meet UL requirements for wet or damp locations 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. This electronic fluorescent ballast is ideal for bathrooms, hallways, and partial daylit areas.