Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 455
ion was determined many years agoit is not very generally known. Since the. b2 440 THE ILLUMINATING ENGINEER (sept.) most ready method, in determiningthe brightness of illuminated ceilings,screens, etc., is to obtain results in termsof foot-candles, it is useful to know-how to convert these values… … Pig. :. Let a be a unit area receiving anintensity of illumination E. Then theamount of lij-dit received by the unitarea is B lumens and the amount oflight emitted by it is mE lumens (//being the diffuse reflecting power asmentioned above). And since we are dealing with a unit area mE is also equal…
Lighting
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