Combination exit signs with emergency lights are all-in-one fixtures that mark exits and illuminate pathways to guide evacuations from buildings. They hardwire into an electrical system and automatically switch to their battery backup after a power loss to keep the exit sign lit and turn on the emergency lights. They can stay lit for at least 90 minutes. Emergency exit light combo units meet requirements for exit signs along an egress path, at doorways leading to exits, and at exits. They must be installed and regularly tested in accordance with local safety codes. Mounting them at the recommended spacing provides coverage to meet code-specific illumination levels along the path of egress and eliminate dark spots without overlighting. General purpose exit light combos install in dry, nonhazardous locations. Wet location exit light combos withstand exposure to water.