Abstract
A new standard pencil task is proposed for the determination of contrast rendering factors. This takes the form of a pencil circle drawn on a lambertian background, and permits the adoption of simplified methods of measurement and prediction. A new step-by-step design method is proposed for contrast rendering in large offices. The initial choice of luminaire is based on a weighted average room contrast rendering factor (RCRF). The spacing is based on the CRF at a point of symmetry between rows of luminaires.
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