Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 224
1 . . -ft =— (sin o-tan-1 sine+sin 0 tarn _1 sin <r) On substituting these ^ 2x6-68 E= —— (0-892 x0-743+0-918x0-727) = 5-65 foot-candles The observed value was 5-5 foot-candlesin the centre of the room. It was found that the height of thereference plane did not affect the observedvalues very… … VII.—Indirect (tungsten lamp) lighting in a Motor Car Showroom. where E=horizontal illumination pro-duced underneath the centre of a hori-zontal uniformly luminous rectangleemitting an illuminaion of E1 foot-candles, and a- and e are the anglesshown in Fig. 22. For the case considered the valuesare…
Lighting
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