GE Lighting 74463 (4-Pack) GE432MV-N Multi-Volt ProLine Electronic Fluorescent T8 Instant Start Ballast, 120 to 277-Volt, 3 or 4 F32T8 Lamps Instant start ballasts for long start cycle and reduce energy cost. Allows for multi-voltage setting from 120 to 277 volts. Will accept up to 3 or 4 F32T8 lamps Ballast provides auto-restart functions and thermal protection. Mounting dimensions: 9-Inch L x 1.1-Inch W, mounting slot set 0.3-Inch apart.