The average illuminance in a rectangular room with a reasonably regular lighting layout is obtained from measurements along two lines, at right angles to each other. The room average is then simply the product of the line averages, divided by the illuminance at the intersection of the two lines. The new method is simple, saves time and is of adequate accuracy, if the uniformity of illuminance is within accepted limits.
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References
1.
CIBS Code for Interior Lighting p 154 (London: Chartered Institution of Building Services Engineers) (1984)
2.
SABS Code of practice for Interior Lighting p 71-74 (Pretoria : South African Bureau of Standards) ( 1984)
3.
IES Lighting Handbook Reference Volume p 4-34 (New York : Illuminating Engineering Society) ( 1981)
4.
CIBSE Technical Memorandum 5 (London: Chartered Institution of Building Services Engineers) ( 1980)
