Inside Out Library
A study of direct and indirect illumination (1912)
Simons, Alexander McDougall · leaf 22
7 … Fig. 6. Photometric curve of a 100 watt tungsten lampfitted with a steel reflector of the Extensive type, iILighting · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
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