A practical method for evaluating the error caused by imperfect
V (λ) matching is developed. The method uses the color correction factor (K
Hg) of a detector for a clear-bulb high pressure mercurylamp as its evaluation value. Using various spectral response data of 81 photometric detector models and of 77 actual detectors, the correlation between the value K
Hg, in addition to the evaluation value k (400-760 nm) of Japanese Industrial Standard (JIS-C-1609) and the evaluation value f
1' recommended by CIE, and the color correction factors for 33 other kinds of discharge lamps is analysed. The results show that the value K
Hg obtained by this method gives as good a correlation with the maximum color correctionfactors for other discharge lamps as the evaluation value f
1' does. The evaluation value k of JIS, on the other hand, gives poor correlation. Since the value K
Hg can be measured quickly using a standard incandescent lamp and a high pressure mercury lamp, this method is useful as a practical method for evaluating the spectral matching of photometric detectors.
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