This Philips HF-R 236 TL-D dimmable ballast runs 2 x 36w T8 fluorescent tubes or 2 x 36w PL-L lamps. This ballast's lamp power can be regulated from 1% to 100%, automatic stop start, automatic restart after lamp replacement, up to 75% reduction in energy consumption and quick programme flicker free start.The Philips HD-f ballasts are commonly used in offices. These units are for use with installations with emergency back up.