What it is for
Emergency lighting maintains safety functions when normal lighting fails. It helps people recognise routes, changes in level and protective equipment. It must not be confused with decorative lighting or a photoluminescent sign. A sign identifies a destination; lighting provides the visibility conditions intended for movement or safe completion of a task.
Related concept: Workplace lighting.
Types and purposes
Safety lighting includes escape-route, open-area or anti-panic, and high-risk-task functions. Standby lighting aims to allow activities to continue under specified conditions. These purposes are not equivalent: lighting an exit does not guarantee that a complex machine can be stopped safely, and standby lighting does not ensure coverage of an entire escape route.
Where coverage is reviewed
Exits, junctions, stairs, changes in level and points where emergency equipment is used are considered. Review starts with the actual route, with furniture and doors in their usual positions. Counting luminaires is insufficient. Screens, racks and new partitions may cast shadows or leave an important area unlit.
Duration and operation
Tests must check activation and duration against the design and applicable requirements. An illuminated indicator does not demonstrate battery condition or available illuminance. Defects, replacements and restoration of charge after tests are recorded. Work is organised to avoid leaving the workplace unprotected during subsequent occupancy.
Example of a partial failure
In a hypothetical example, the lighting circuit on a stairway fails while other areas remain powered. The solution must be checked against that scenario, rather than only a complete building blackout. The analysis includes the immediate outside access and changes of direction used by occupants.
Regulations and limitations
In Spain, the REBT, particularly ITC-BT-28 where relevant, and building regulations establish requirements. Lighting levels and operating durations depend on function and scope, so one figure does not apply to every space. The installation requires competent electrical maintenance and coordination with the emergency plan.
