Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 160
each lamp-post. The problem in street lighting is thatof distributing brightness, i.e., of reducingcontrast between light source and illu-minated surfaces. The gas-filled lamp,when equipped with suitable appliances,can be made to satisfy the problem as wellas, if not better than, other… … 20 25 30 35 40 DISTANCE APART IN FEET Fig. 11.—Relativejillumination values for street lighting gas-filled lamps v. open arc lamps.Foot-candle curves of combined results given by two lamps placed 60 feet apart and15 feet high in fittings as shown.
Lighting
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