Programmed Rapid Start T8 Ballast will accept up to 3 F32T8 lamps Accommodates multi-voltages from 120 to 277-volts, extra versatile for your unique projects Extends lamp life in frequently switched applications, more than 100,000 on/off cycles Ultra-efficient programmed start ballasts with more than 90-Percent efficiency Mounting dimensions: 8.9-Inch L x 1.1-Inch W, Mounting slot set 0.3-Inch apart GE332-MVPS-N