The Philips HF-P 158 TL-D high frequency fixed output ballast is for use with 1 x 58w T8 flourescent tube and 1 x 55w PL-L 2G11 lamp. This ballast has 50% longer lamp life, smart power, automatic safety stop and universal connector for both manual and automatic wiring. This Philips unit is for use in Department stores, Supermarkets, Airports, Railway Stations, Hotels and Hospitals. This ballast is suitable for installations with emergency back up.