Some TLED retrofit lamps have internal drivers that can accept AC input through the original fluorescent ballast or through connection to line voltage.
These TLED replacement lamps have internal drivers that convert AC to DC in order to power the LED array. When emergency lighting is required in these fixtures, an emergency ballast or emergency inverter with AC output may be used. See types A and B for more information.
If the TLED replacement lamps do not have internal drivers, an AC LED driver with DC output must be used to replace the fluorescent ballast. Likewise, an emergency driver that provides DC output must be used to drive the TLED lamps when normal power fails. See Type C for more information.
Certified electricians or qualified contractors should be used to convert LED retrofit fixtures into emergency lighting fixtures.