Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 147
Fig. 14.— Distribution curve of hare tunjistenLamp (1) and same lamp in white glass re-tlector (2) (open type). … Fig. 15.—Distribution curve of bare tungstenlamp (1) and same lamp in white glass re-tiector (2) (bowl type). most pronounced focussing effect isobtained by mirrored glass, in whichdirect as opposed to scatteredreflection is the most important element.Compare with Figs. 9 and 10. Value of Exact…
Lighting
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