this is the measurement of sunlight, all those metrics are calculated using the reconstructed spectrum.
most metrics are good enough(XYZ calibration should be used in conjunction with spectral reconstruction, XYZ for metrics like CIE sx/sy and cct and so on, while spectral calibration for color rendering index).
the spectral graph drawing is kinda distorted now, I guess the spectral curve is too smooth because the sensor can not detect the minor details in the real sun spectrum(I have not compare with cl-500a measured spectral curve yet, but I guess there could be some zigzags in the real sunlight curve ). below is the sun spectra curves I measured long ago(totally different weather condition compared with above graph).
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