| Definition: | measurement of quantities referring to radiation as evaluated according to a given spectral luminous efficiency, e.g. V(λ) or V′(λ) Note 1 to entry: The term "photometry" is sometimes used in a broader sense covering the science of optical radiation measurement (radiometry), but this use is deprecated. Note 2 to entry: This entry was numbered 845-05-09 in IEC 60050-845:1987.
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