Most general lighting installations are planned assuming that the space between luminaire plane and working plane is empty. In reality, however, building interiors contain objects which project above the working plane and which may influence interior visual conditions in ways which cannot be predicted by existing design methods. A computer program is described which enables the designer to undertake accurate analysis of the illuminance conditions within an obstructed interior for a specified configuration of room geometry, room contents and lighting equipment. In case study computed results are compared with measurements from a real installation.
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