Excerpt from The Technograph, Vol. 28: A Quarterly Publication of the Engineering Societies of the University of Illinois; November, 1913
The real problem in planning for artificial illumination is there fore not so much the amount of light as the manner in which it is applied. The ideal light-source would naturally be one which would give a uniform number of rays upon the work from all directions. A condition which may be approached with daylight. But daylight is free, artificial light costs, and economy must be considered. As a result we find tables stating definitely the light in foot candles desirable for different classes of interiors such as parlors, Offices. Drafting - rooms, etc., these tables indicating the probable minimum lighting which most eves would need to dis cern clearly the Objects in the room or to perform the work re quired of them. In many cases the values given could be lowered if good distribution and diffusion were assured, as is later ex plained.
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