Specification of foot candles on sound scientific basis as major objective of illuminating engineering; brief review of past practices as to footcandle specification for various tasks; series of tables are presented giving data on brightness levels, brightness contrasts, and visibility levels for various conditions; illustrations of use of tables; considerations for subnormal vision.
Foot candles for critical seeing
Illum Eng
Illuminating Engineering ; 41 , n 10
1946
19 pages
Bibliography
Aufsatz (Zeitschrift)
Englisch
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