Tridonic pc 158 t8 pro the tridonic pc 158 t8 pro is a non dimmable high frequency ballast to run 1 x 58 watt 5ft t8 fluorescent tube tridonic article number 22176094 tridonic pc 158 t8 pro ballasts have an average life of 50 000 hours please note new slim version will be supplied click here to see data sheet and wiring diagrams please note this product has been superseded by a low profile model tridonic article number 22185215