This product has been replaced by the 12x26 42 tc pro which can be found here tridonic pc 12x26 42 tc pro the tridonic pc 22632 tct pro is a non dimmable high frequency ballast to run 2 x 18 watt long single turn compact fluorescent lamps 2 x 24 watt long single turn compact fluorescent lamps or 2 x 26 watt double turn compact fluorescent lamps or 2 x 26 watt triple turn compact fluorescent lamps 2 x 32 watt triple turn compact fluorescent lamps or 2 x 22 watt t5 circular fluorescent tubes