Abstract
While almost every aspect of lighting design for the whole visual field has been studied and much data accumulated, no single comprehensive method of design making full use of this work has been evolved.
The purpose of this paper is to describe an investigation made with the object of devising a method of lighting design in which the type, number and arrangement of fittings are determined from a consideration of the illumination and brightness patterns required at all surfaces in a lighted interior.
The chief factors to be considered when designing a lighting installation are presented and an analysis made of the present state of knowledge and practice. Use of the sector flux method of direct illumination calculation for linear sources has been checked and extended, a method of measuring and expressing the ratio of the direct to total illumination at any point in a room is described, and the assessment of glare is considered. These factors, direct lighting calculation, the Building Research Station glare data, and an experimentally determined inter-reflection ratio are combined, leading to the proposition of a new design method which takes account of the brightness pattern on all surfaces affecting an interior lighting design.
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