Tridonic pc 2x36 t8 pro sl the tridonic pc 2x36 t8 pro sl is a non dimmable high frequency ballast to run 2 x 36 watt 4ft t8 fluorescent tubes tridonic article number 22185217 tridonic pc 2x36 t8 pro sl have an average life of 50 000 hours product no 22185217 l x w x h 280 x 30 x 28 mm