The Sunlight Beam Index

How much sunlight can enter a room? This paper provides you with a methodology to answer this question and introduces an innovative new measure - the Sunlight Beam Index (SBI). The new measure, which presents a cross-sectional area of the sunlight beam that passes through a window and enters the main volume of internal space, is described and examples are given for a typical residential house. It concludes that the measure is suited for rating, planning and/or guideline purposes as the SBI can be calculated on a yearly or monthly basis.

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