How to Replace the Batteries in an Emergency Light
1:26
EL-M2 Bright LED Emergency Light
2:46
Emergency Lighting
3:21
Testing Emergency Lighting
3:23
Emergency light bulb change
An emergency light is a battery-backed lighting device that switches on automatically when a building experiences a power outage. Emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories, apartments, and hotels. Most building codes require that they be installed in older buildings as well.