Methods are given for calculating the light output of an enclosed or reflecting fitting. The formulae are derived from Ryde and Cooper's work, and experimental results give satisfactory confirmation. The light output of any specified fitting is shown by a nomogram and the comparison is made between B.S.S.324 and the German Specification DIN.5036.
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References
1.
British Standard Specification: “Translucent (Diffusing) Glassware Illumination Fittings for Interior Lighting” (B.S.S. 324–1934), November, 1934.
2.
Deutsche Normen: “Rating and Measurement of Illumination Glassware” (DIN 5036), November, 1935.
3.
Ryde and Cooper: “Theory and Specification of Opal Diffusing Glasses, Part I.”Illuminating Engineer, p. 33, February, 1933. RydeCooper and Stoyle: “Theory and Specification of Opal Diffusing Glasses, Part II.”Illuminating Engineer, p. 41, February, 1933. Ryde: Proc. Roy. Soc. A, 131, 451 (1931). Ryde and Cooper: Proc. Roy. Soc. A, 131, 464 (1931).
4.
Moon: “Scientific Basis of Illuminating Engineering;”New York, McGraw-Hill (1936), p. 289.
5.
Luckiesh and Moss: “Seeing,”London, Baillière, Tindall and Cox (1931), p. 57.
6.
Higbie: “Lighting Calculations,”New York, John Wiley and Sons (1934), p. 267.
