Brightness measurement of electroluminescence is troublesome, since levels of brightness are sometimes very low and the emission from electroluminescent light source is colored.
The spectral response characteristics of a brightness meter deviate partly from true eye sensitivity, and so the meter calibrated to the illuminant A standard lamp shows a large error for colored light source photometry.
Problems of determination of instrument error due to color of a light source are discussed in this paper. The method of evaluation of errors described in this paper has been developed by Mr. R. W. Wollentin. The meter's correction factor is derived from ratios of relative quantity of light passing through arbitrary blue, green, yellow and red filters.
The correction factor obtained by this method differs depending on the selection of standard colored light sources. The problems of errors due to selection of these standard light sources are discussed mainly.
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