Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 157
Fig. 7.—Light distribution from reflector.Effect of alteration of size of filamentmount of vacuum type and gas-filledLamps. found impossible to obtain wide angle orextensive light distribution (spacing ratioof 2 to 1) (see Fig. 20) in any type ofsimple over-reflectoi with the form offilament used…
Lighting
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