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Xtralite Rooflghts ...Daylight in Perspective Industry Bodies Legislation Standard Rooflight Specification Structural Rooflight Specification Case Studies News Downloads Contact Us The Daylight Factor The daylight factor is the CIE recommended method for determining the performance of a daylighting system. It is useful for estimating the amount of... See #1 1: http://www.xtralite.co.uk [c297822]