The Philips HF-P 270 TL-D high frequency fixed output ballast is for use with 2 x 70w T8 flourescent tube. 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. PLEASE NOTE THE 2/70 VERSION IS NOW OBSOLETE. THE PHILIPS 2/58 VERSION WILL NOW BE SUPPLIED WHICH ALSO RUNS TWIN 70W T8 TUBES.