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As in the preceeding article by Glenn Fry, the method described here is the basis for criteria established in RQQ Report No. 3. In this article, the author presents the method that permits the simplified evaluation of a luminaire from the standpoint of Visual Comfort Probability (VCP). The derivation of the basic concept of dividing the ceiling into zones and sectors, the procedure for deriving a value from the Guth formula, and the use of a graph for computing L̄ are shown.
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