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Emergency lighting

A power failure means darkness. In a windowless room, even during the day. The sudden plunge into darkness causes fear, makes it hard, even impossible, to get bearings. Its a situation that can quickly lead to panic - especially in buildings used by lots of people who don't necessarily know their way around.

To avoid this scenario, the law requires an emergency lighting system which is independent of the mains. It may be powered by emergency batteries or it may have a specially secured, separate line power supply. In the event of mains power failure, emergency lighting needs to kick in within seconds. The light it provides - a low lighting level is enough - makes for better orientation, permitting people to leave the building safely.

Emergency lighting is an umbrella term covering both safety lighting and standby lighting. Safety lighting encompasses:

safety lighting for escape routes
anti-panic lighting
safety lighting for particularly hazardous workplaces(www.greendyled.com)