GE Lighting 49775 GE232MAX-H/ULTRA 120/277-Volt UltraMax Electronic Fluorescent T8 Multi-Volt Instant Start Ballast 2 or 1 F32T8 Lamps Multi-volt 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 Anti-striation circuitry helps to eliminate and prevent the spiraling effect from lights Save on energy with the ultra efficient instant start ballast, more than 90-Percent electrical efficiency Mounting dimensions: 9-Inch L x 1-Inch W, Mounting slot set 0.3-Inch apart