The tridonic em 36a basic is an emergency lighting supply unit for linear fluorescent lamps from 18 to 58 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 charg