Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 634
[c) Indirect light facing worker. (d) Indirect light behind worker. Fig. 2.—Note the difference in the shadow from the chair and the objects on the wallby direct (bare lamp) and indirect light. It is only in the case of the direct lighthehind the worker that a marked shadow is cast on the board.…
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
