You can be broken down into three different categories:Emergency escape lighting: When people need to leave a building in an emergency and the power has gone out, such as in the event of fire, emergency lighting covers all escape routes. The aim is safely guiding people to their nearest exit via lit escape routes.Emergency safety lighting: This applies when power has failed, but it’s not an emergency situation. Emergency safety lighting is enough for people to remain in areas of a building while power is restored, but it’s not enough to carry on working.Standby lighting: This is back-up lighting that is activated during a power cut to a level that allows work to continue. This has to be 100% of the normal lighting.