Abstract
It is shown how the application of the recently introduced equi-maintained lux approach for the maintenance of a lighting system leads to significant cost savings over the conventional equi-interval criterion, the latter normally being used to find the optimum solution to the problem of achieving the desired maintained illuminance level for the minimum overall cost. Greater advantages result in the case of polluted environments, illuminated by indirect systems, with frequent luminare cleaning and high costs for lamps and for room surface cleanings. A simple and accurate procedure for determining the optimum maintenance programme for a lighting installation by applying the equi-maintained lux criterion is given.
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