Methods of Representing Light Distribution

  • H. A. E. Keitz
Part of the Philips Technical Library book series


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. 1).
    This derivation of the sinusoidal projection is taken from a publication by R. Swierstra, Euclides 12, 1935, 56 (in Dutch)Google Scholar
  2. 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. 3).
    I.S.A. Bulletin 11, “Preferred numbers”. Dec. 1935Google Scholar

Copyright information

© N. V. Philips’ Gloeilampenfabrieken, Eindhoven (The Netherlands) 1971

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  • H. A. E. Keitz

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