Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 68
e effect of definitely increasing thevalue of certain portions of the floor area.Again, any factory which is properlyequipped with windows for providingdaylight conditions throughout, duringall the hours of the working day, if un-equipped with an artificial lighting systemis not in a condition to… … HOURS OF THE DAY Fig. 2.—The lower curve shows that for a given prescribed minimum value oflight for the work; for given exterior daylight conditions, and for a given day-light factor artificial light will be required before 10 a.m. and after 2 p.m. on anaverage December day. The shaded areas of…
Lighting
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