Philips Advance Mark 10 Powerline dimming ballasts make converting your existing fixtures as easy as 1-2-3. Simply replace the ballast, replace the switch, and dim the lights. That's all it takes! The Advance VEZ-2T42-M3-LD dimming fluorescent ballast operates (2) 42 Watt CFL lamps at 277 input volts. Ideal for use in normal light areas, this ballast is typically used in offices, board rooms, and retail.