Fire emergency lighting is lighting that turns on when the mains electricity fails for whatever reason. In the event of a mains failure, the fire emergency lighting turns on and illuminates to lead occupants to the nearest fire exit. In an outage, the lights should stay on between 1 to 3 hours to ensure that all occupants have time to evacuate the building and emergency services can access the building safely if necessary.
Fire emergency escape lighting needs to remain on for a minimum duration of three hours on premises that you cannot evacuate immediately, such as places where people sleep, like hotels. Minimum illumination falls to one hour in situations where you can evacuate the premises rapidly and don’t need to re-occupy the premises quickly.
Organisations should test their lights annually for the full test duration to ensure that they can provide emergency lighting for the required period. If they cannot, then the backup battery requires replacement.