The Philips HF-P 240 PL-L is a non-dimmable high frequency ballast to run: 2 x 40 Watt PL-L long single turn compact fluorescent lamp.This ballast has programmed warm start, flicker free, 50% longer lamp life, smart power and automatic safe stop.The Philips HF-P PL-L is suitable for use in Department stores,Airports,railway Stations,Hospitals and Hotels. This item is for installations with emergency back up.