Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 33
s, but it is interestingto know that it has received the endorse- * This ratio of 10 between the value inLumens and the mean horizontal candlci^oweris derived as follows :— The mean spherical candlepower of theordinary vacuum metal filament lamp is 78 percent, to 79 per cent, of the mean… … 0 15 50 z ■i< C«n<flt Powtr 1 Candle Powff Lamp and Reflector Bare Lanp 1 ^1 Lamp tiRofl. B.reLamp Lamp Ba,>Lamp Zone . . . 0-60* 1 0-90 {O-180-1 0-60 0-90 0-I80- 3 0- 4diA 90* Lumens . .6/7.5 ko^.ol \ 8660 a 5* 4760 95* R.ftec.0, A-^^y f^ 710 Holder /OZ-AT, -(9.*L.™pA/0-?fifarf|gW.„.…
Lighting
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