emergency lighting
nounUK /ɪˈmɜː.dʒən.si ˈlaɪ.tɪŋ/
US /ɪˈmɝː.dʒən.si ˈlaɪ.tɪŋ/
Lights that turn on when the normal lights stop working so people can still see.
The emergency lighting came on as soon as the power went out.
OTHER MEANINGS
2. A lighting system designed to guide people safely out of a building during a fire or other emergency.
The building's emergency lighting clearly marked the way to the stairs.
3. Lights powered by a battery or generator that keep working when the main electricity supply fails.
Inspectors checked that the emergency lighting stayed on for at least ninety minutes.
4. The equipment and fixtures used to provide light during a sudden loss of power.
The maintenance team replaced the old emergency lighting in the hallway.