The tridonic em 39 5 t5 basic is an emergency lighting supply unit for t5 fluorescent lamps the tridonic em 39 5 t5 basic can be used for 39 watt t5 fluorescent lamps 1 or 3 hour rated duration low profile casing selectable operating time 5 pole technology 4 pole lamp changeover and delyaed power switching to the ballast high frequency ac operation of the lamp hot restart in emergency mode gentle on the lamp green charge status led electronically control battery charging po