The philips hf m blue 109 lh tlpl is a linear non dimmable high frequency ballast to run 1 x 6 or8 watt t5 fluorescent tube 1 x 79 or11 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