The Philips HF-M Blue 109 LH TL/PL is a linear non-dimmable, high frequency ballast to run: 1 x 6 or 8 Watt T5 fluorescent tube 1 x 7/9 or 11 Watt PLS single turn compact fluorescent. This ballast has flicker free start,Multi lamp ballast, Compact power IC and energy saving of more than 25% compared with electromagnetic gear. The Philips HF-M Blue range is suitable for installations with emergency back up.