Tridonic pc 2x18 t8 pro lp the tridonic pc 2x18 t8 pro lp is a non dimmable high frequency ballast to run 2 x 18 watt 2ft t8 fluorescent tubes tridonic article number 22185216 tridonic pc 2x18 t8 pro lp high frequency ballasts have an average life of 50 000 hours product no 22185216 l x w x h 280 x 30 x 21 mm