Maintained, non-maintained and sustained fittings
A non-maintained luminaire is dark in normal use and illuminates only when the supply fails — the usual choice for a residential communal corridor or staircase, since there is no reason to run it constantly. A maintained luminaire is lit all the time and simply continues on battery when the mains fails, which is what you need where people gather in a space that may be deliberately darkened, such as a cinema, bar or function room. A sustained fitting combines both, with separate lamps for mains and emergency operation. Getting the type right matters for compliance as well as running cost, and we identify the type of every fitting on your certificate.