Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 23
ency ofother illuminants were plotted in adiagram of this kind. For^in all suchcases advances in efficiency are commonlyaccompanied by changes in the distri-bution of light. The curve givingthe values in Lumens per watt, how-ever, gives a true record of the advancesecured. A further serious defect… … ^ ^^ fii /94 ^J^ J Fig. 6.—Advance in eltctric iiRandcscent lamp tHicieiicy. The above curves show the advance in the efficiency of electric lamps o\ er anumber of years. The lower curve expresses the efficiency in HorizontalCandle poire r per Watt ; the upper curve the efficiency in ■• Lumens per…
Lighting
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