Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 160
es related tothe net loss after the reflecting value ofthe glass had been credited, many typesof commercial glass transmitted only40 per cent., reflecting 40 per cent.; if reflecting surfaces, and at tin1 same timediffuses the light to a comfortable degreeof intrinsic brilliance. Capt. E. Stroud… … the 40 per cent, reflected was absorbedby the ceiling owing to dirt or otherreasons the semi-indirect lighting systembecame very inefficient. For this reasonMr. Harrison advocated the use of totallyenclosing fittings, such as two hemispheresthe upper of which had a high reflectingvalue and low…
Lighting
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