Get on-demand backup lighting without an emergency light fixture. The A19 bulb automatically switches to backup mode when the power goes out and provides 3.5 hours of continuous use at 60% brightness. Provides up to 3.5 hours of light with lithium-ion backup battery. Turn bulb on and off as you wish during a power outage. Damp-rated for any room of the house. Uses 11.5W power consumption while turned on.