An emergency light is a battery-backed light that switches on automatically when a building experiences a power outage. They are usually placed in stairwells, hallways, and at designated exit points to guide occupants to the safest pathways out of the building.
An exit sign is used to signify the location of the nearest exit in case of an emergency. There may be multiple exit signs in different colors to help designate primary and secondary exit locations. Both devices help lead people to safety in the event of an emergency and work best when used simultaneously.