Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 32
ncreasing the work-ing illumination is more orless marked, and materiallyinfluences the co-efficient ofutilisation (i.e., the percent-age of the total light fromthe lamps installed receivedon the working area). Butapart from this increase inillumination the appearanceof illuminated objects should… … Table of Co-efficients of Utilisation. (From the B.T.-H.Incandescent Electric Lamp Handbook, Xo. 1a). obtained from a single unit, whereas indark surroundings it could only beobtained with difficulty by using anumber of closely spaced lamps. The co-efficient of utilisation de- fined above is a…
Lighting
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