Instant Start T8 Ballast will accept up to 3 or 2 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