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Abstract

The IES Code relies on the specification of horizontal illuminance for the majority of lighting installations. From the earliest days it was realized that the illuminance on other surfaces was also impartant. The paper considers the suggestion that for overhead lighting installations a vector/cylindrical illuminance ratio might be more informative than the vector/scalar illuminance ratio already used. Values of vector/scalar illuminance ratio and vector/cylindrical illuminance ratio are calculated for situations in which a figure is viewed under two quite different light distributions and for two reflectance combinations. The vector/ cylindrical illuminance ratio is shown to be marginally better than the vector/ scalar illuminance ratio for controlling the modelling properties of an installation. It is argued that, in addition, cylindrical illuminance is a more useful quantity than scalar illuminance.

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Lighting of occupants and objects within an interior

Abstract

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