The tridonic em 35d basic is an emergency lighting supply unit for compact fluorescent lamps from 32 to 42 watts properties of tridonic em basic ballasts 3 hour rated duration can be used with all electronic ballasts both dimmable and non dimmable suitable for use in combination with magnetic ballasts 5 pole technology 4 pole lamp changeover and delayed power switching to the ballast optimised ac output voltage for tc dd and tc l lamps optimised dc output for t8 lamps green char