Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 59
^, so tliat theabsorption Avas particular^ Ioav. An-other slide shoAved the photometriccurve of the loAver reflector boAvl, theefficieucy of Avhich Avas 86 per cent ;of this. 72 per cent is reflected in the Fig. 1.—Semi-Indirect Reflector Fitting of OpalLower Reflector Bowl and White… … Fia. 2.—Section of the same Fitting. .f?Pi,£C*0;it. £F7frS-ie4L^? S?
Lighting
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