"What is the difference between Maintained and Non-Maintained luminaires?
The terms Maintained and Non-Maintained are used to describe the mode of operation for an emergency lighting luminaire, and the decision on which mode of operation to use is determined by the use of the permises (sic!).
Maintained Emergency Luminaire
This is a luminaire in which the emergency lamps are lit all the time. Maintained mode is generally employed in places of assembly such as theatres, cinemas, clubs etc. The lights are typically dimmed when the premises are occupied, and the emergency escape lighting prevents total darkness.
Non-Maintained Emergency Luminaire
This is a luminaire whose lamps only come on when the power supply to the lighting fails. Non-Maintained lights are typically found in the work place where artificial lighting is normally deployed whilst the premises are occupied."