Where is it vital to have emergency exit lighting?
An emergency escape lighting system should typically include the following, according to the HM Government document Fire safety risk assessment: offices and shops (p. 100), in further detail:
every exit door
egress points
Corridor crossovers Outside each exit's door and along external escape routes
Emergency exit signals
Stairs that provide enough light for each flight
Changes in floor level and toilet accommodations larger than 8 m2 that lack windows
equipment for fighting fires
Call points for fire alarms
Equipment that would have to be turned off in a crisis
Lifts
Areas in buildings larger than 60 m2
Each of the aforementioned items doesn't need its own light source (luminaire), but there should be enough overall illumination to make them visible and functional.
