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Standard skies for maritime climates

School of Architecture, The University of Sheffield, Western Bank, Sheffield S10 2TN, UK

A set of 15 standard skies proposed by Kittler, Darula and Perez was compared with a large sample of measured sky luminance distributions from Singapore, Japan and the United Kingdom. It was found that (a) the standard set gives a good overall framework for categorising actual skies; (b) subsets of about four luminance distributions were adequate to describe the skies that occurred at each site; (c) inhomogeneity of actual skies in maritime climates leads to uncertainty in interior daylight predictions (typically the room illuminance computed on the best-fitting standard sky might have a variance such that 80% of calculated values lie between 0.8 and 1.3 of the real value); and (d) this error range is significantly less than when calculations are based on an overcast sky alone.

Lighting Research and Technology, Vol. 31, No. 3, 97-106 (1999)
DOI: 10.1177/096032719903100304


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