Emergency Lighting in it’s simplest terms is lighting that is available when the mains power fails. This enables you to exit a building safely in an emergency power outage situation.
A building will have an emergency lighting system consisting of exit signs and emergency luminaires that emit light to a specific level.
Above is a typical exit sign
you usually see these above doors and indicate which is the best way to exit the building.
This is a typical bulkhead
these are the simplest form of self contained emergency lighting and you will probably see them in corridors or rooms where the decor isn’t that important.
These twinspots are used for lighting up large areas or for fixing to walls high and out of the way.