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Published in:
1971 | OriginalPaper | Chapter
Measurement of Illumination
Author : H. A. E. Keitz
Published in: Light Calculations and Measurements
Publisher: Macmillan Education UK
Included in: Professional Book Archive
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Illumination is measured either in order to know the illumination itself, i.e. to obtain a value of this quantity expressed in lux or footcandles, or as an intermediate stage in ascertaining values of other photometric quantities, in which case it is usually sufficient to know the illumination as a relative value only. In the foregoing sections on the measurement of luminous flux and luminous intensity, examples of this procedure have already been given.