luminaires are permanently illuminated, and remain illuminated when power fails. They are used for tasks such as emergency exit lighting. In some cases they may be switched off deliberately, but are usually required to be active when a building is occupied, or when the public are admitted, such as for a theatre. Sustained or non-maintained luminaires may be switched on and off normally. If the power fails, they turn on automatically. See also Lightstick Exit sign References External links What is an emergency light? Emergency lights test UK ICEL Industry Committee for Emergency Lighting (UK) NEMA Emergency Lighting Section National Electrical Manufacturers Association (US) How to locate emergency lighting - a guide (UK) Planning and Placement - An Emergency Lighting Guide (UK) Lighting Safety equipment