Brightness Engineering

Brightness engineering at its present stage of development can be defined as the extension of illuminating engineering by adopting and producing limiting brightness ratios in interiors where comfortable and easy seeing are primary considerations. Further development hinges on the acceptance of a generalised brightness code, and two possible methods of establishing this are considered in the light of recent work on the subject.Methods of brightness design using inter-reflection tables are described and the associated problem of brightness measurement is discussed. The field flux method of lighting design based on zonal flux distrubtion is compared with the brightness ratio method.In the wider sense, brightness engineering involves prescribing and producing a good visual environment and offers to lighting engineers both greater scope and heavier responsibilities.