In practical integrated lighting design, it is indispensable to clearly define the actual condition of the sky luminance or the illuminance from an unobstructed hemisphere of sky. Almost all studies conducted in the past were restricted only to typical clear or overcast sky conditions. The data obtained from these studies are of little use for practical lighting design.
The purpose of the present study is to obtain a useful daylight data for practical integrated lighting design in regard to the whole working hours in a year.
The total horizontal plane illuminance
E0 from an unobstructed hemisphere of sky is regarded as the basic data for practical lighting design. Horizontal plane illuminance
E'0 from 1/4 north sky was measured by an automatic recorder continuously for two years, from Dec. 1970 to Nov. 1972, in Suita city, Osaka.
E0 is regarded as equal to 4
E'0.
Considering office integrated lighting utilization as the main object,
E0-cumulative occurrence rate curves for working hours in regard to annual, heating and cooling periods, are derived from two years' measured data.
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