Divergence of light beams emitted by filaments of various forms has been examined, and an equation for minimum divergence is presented. Some corrections for shallow parabolic reflectors are necessary. A graphical method of obtaining the divergence curve is described.
In: Recueil des travaux et compte rendu des séances, Commission Internationale de l'Éclairage (CIE), septième session, Saramac Inn, New York, septembre 1928, p. 359-380
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