Visual comfort probability (VCP), also known as Guth visual comfort probability, is a metric used to rate lighting scenes.
VCP is defined as the percentage of people that will find a certain scene (viewpoint and direction) comfortable with regard to visual glare. Visual Comfort and Productivity, tristate.apogee.net; retrieved February 16, 2014 via Wayback Machine It was defined by Sylvester K. Guth in 1963.
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