GE Lighting 72275 GE232-MV-N 120/277-Volt Multi-Volt ProLine Electronic Fluorescent T8 Instant Start Ballast 2 or 1 F32T8 Lamps Instant Start T8 Ballast will accept up to 2 or 1 F32T8 lamps Accommodates multi-voltages from 120 to 277-volts, extra versatile for your unique projects Instant start electronic ballast for long lamp starting cycles and low initial cost High performance instant start electronic ballast is for all general fluorescent applications Mounting dimensions: 8.9-Inch L x 1.1-Inch W, Mounting slot set 0.3-Inch apart