An illumination apparatus includes an adapter that is detachably and electrically connected a fluorescent lamp socket; a power supply unit in the adapter to supply power; a light emitting device driver that generates driving power from the power supplied by the power supply unit; a controller that controls the light emitting device driver; and a light emitting device illumination unit that emits light according to the driving power from the light emitting device driver and that is electrically connects the power supply unit to another fluorescent lamp socket.