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Re-Evaluation of Daylight Spectral Distributions

By Balzs Krnicz Jnos, Balázs Kránicz and János Sch

Abstract

The spectral power distribution of colorimetric daylight illuminants was determined based on measurements [1] done some 40 years ago. The data were averaged and standardised at every full 10 nm. Later, to follow colorimetric practice, these data have been interpolated (linearly) to every 5 nm, but the factors to calculate the values have not been changed. We show in this paper that this is not correct, and leads to some discrepancies, especially if data with even smaller step size are required. We suggest that when correcting this discrepancy one should at the same time go from the linear interpolation technique, a rather crude method for a spectral distribution with many minor minima and maxima in the spectrum, to a non-linear one. We show that a third order spline interpolation can provide smooth functions resembling the original data to a high degree. 1. First statement There are inconsistencies in the calculation method of Daylight spectral distributions. These should be corrected...

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