Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 506
illus-trating the performances of an ordinarytungsten filament run at variousefficiencies, was given. It will be seenhow rapidly the life falls off when theefficiency is increased beyond one candleper watt. On the other hand the half-watt lamp (shown by the thick curve)was still giving over 80 per… … Half-watt 0 100 200 300 400 500 600 700 800 Hours. FlG. 1.—Showing diminution in candle-power of ordinary tungsten lamps (fine line)at various efficiencies, compared with a half-watt lamp (thick line). [Dr. K. Mey.] efficiency and strength of the ordinarytungsten lamp, one of the mostnoteworthy…
Lighting
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