Editing Emergency light (section)

{{Short description|Backup light source used in power outages}}
{{distinguish|Emergency vehicle lighting}}
{{Globalize|article|USA|date=December 2010}}
[[File:Emergency light at hallway in building.jpg|thumb|upright=1.3|A hallway under regular lighting (left) and emergency lighting (right)]]
[[Image:Emergency light old.jpg|thumb|US-style emergency lighting fixture]]
An '''emergency light''' is a battery-backed [[electric light|lighting device]] that switches on automatically when a building experiences a [[power outage]]. 

In the United States, emergency lights are standard in new commercial and high occupancy residential buildings, such as college [[dormitory|dormitories]], [[apartment]]s, and [[hotel]]s. Most [[building code]]s in the US require that they be installed in older buildings as well. [[Incandescent light bulb]]s were originally used in emergency lights, before [[fluorescent light]]s and later [[light-emitting diode]]s (LEDs) superseded them in the 21st century.