An emergency lighting system is designed to create personal safety and allow the safe evacuation of the building. An emergency lighting system must work faultlessly in all situations which is why high demands are made on reliability. The system is a safety element and must be well designed and planned. The design of emergency lighting systems are specifi ed in the standards BS 5266 Parts 1 & 7 and EN 1838 Demands are made in the standards for different environments and application areas. Examples of different environments where demands vary are: escape routes, anti-panic lighting and lighting of high risk areas. The emergency lighting system usually consists of a combination of safety signs and general luminaires equipped with an emergency lighting function. An emergency lighting system can be either centralised or decentralised, i.e. with a central power supply or with an integratedemergency lighting solution direct in the luminaire.