This product has been replaced by the 12x26 42 tc pro which can be found here tridonic pc 12x26 42 tc pro the tridonic pc pro 1263242 tct pro is a non dimmable high frequency ballast to run 1 x 18 watt long single turn compact fluorescent 1 x 24 watt long single turn compact fluorescent or 1 x 26 watt double turn compact fluorescent or 1 x 26 watt triple turn compact fluorescent 1 x 32 watt triple turn compact fluorescent 1 x 42 watt triple turn compact fluorescent or 1 x 22 watt t5 circul