How long do Battery Powered Emergency Lights remain illuminated?

Battery powered emergency lights are designed to provide illumination during emergencies, particularly in situations where power may be lost. These lights typically remain illuminated for a duration that allows passengers and crew to safely evacuate the aircraft and navigate to exits. The standard duration for which these lights stay on is 20 minutes.

This duration is based on regulatory safety standards and the needs of emergency protocols, ensuring that there is adequate lighting for escape routes after a power failure. The purpose is to give sufficient time for the evacuation process to take place in a controlled manner, minimizing risk to the passengers.