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 Active current regulation independently controls current output to each lamp Mounting dimensions: 9-Inch L x 0.9-Inch W, Mounting slot set 0.3-Inch apart GE232MAXP-L/ULTRA case of 10 ballasts