We calculate and evaluate the influence of the monochromator on the colorimetry of light sources.A spectroradiometric measurement is recommended to get accurate chromaticity coordinates of light sources in JIS Z 8724. In order to get x and y within 0.001 accuracy, we clarify that wavelength error must be within 0.5nm and intrinsic wavelength resolution must be within 5nm. In addition, we clarify that even when intrinsic wavelength resolution is not negligible, the relation between slit width and sampling interval derived by Watarai4) and Nakagawa5) , is valid.
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