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Visual Comfort Probability (VCP) and Unified Glare Rating (unified Glare Rating (UGR)) metrics can be sensitive to small changes in observer position, luminous intensity distribution, and luminaire discretization. Whereas these metrics were originally intended for comparison of luminaires under standardized conditions, they are nowadays offered as photometric analysis tools in lighting design software. The sensitivity of these metrics to changes in input parameters is examined, and recommended guidelines for their calculation and interpretation are proposed.
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Ian Ashdown (2005) studied this question.
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