Methods of Representing Light Distribution
In section IV–1 it was stated that, if the distribution of the luminous intensity of a light source is known, it can be reproduced either numerically or graphically. The numerical method is very simple, entailing only a table specifying the different directions and associated intensities; this is obviously a very convenient method when the data are required for computations, as it is then unnecessary to read the required values from graphs. If a table compiled from measurements of the light distribution is available, the curve is therefore superfluous, but, should it be necessary to interpolate from the values given, a curve will be necessary. On the other hand, a table is seldom used to characterise a light source as it does not present a clear picture of the light distribution.
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- 1).This derivation of the sinusoidal projection is taken from a publication by R. Swierstra, Euclides 12, 1935, 56 (in Dutch)Google Scholar
- 2).J. Dourgnon and D. Fleury, Lux 28, 1960, 53–68, “Diagramme universel pour la représentation des répartitions lumineuses des sources dissymétriques.”Google Scholar
- 3).I.S.A. Bulletin 11, “Preferred numbers”. Dec. 1935Google Scholar