The Philips HF-M RED118 SH PL-C/PL-T is a square non-dimmable, high frequency ballast to run: 1 x 18 watt double turn and 1 x 18 watt triple turn. 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.