In this paper, the achievable accuracy of a reflectance spectrophotometer based on 18 LEDs of different
peak wavelengths in the range of 390–710 nm for object illumination is reported. For simulating the accuracy,
reflectance spectra of the color target ColorChecker® have been used. By weighting the reflectance
spectra of the target with measured relative power distribution spectra of the employed LEDs, simulated
spectral reflectance values of the target are obtained. For calculating color values, unique wavelength
values must be assigned to the simulated spectral sample values. LEDs can be characterized by several
wavelength parameters. It has been shown that, without applying a correction procedure, assigning the
centroid-wavelength of the LEDs as color calculation basis delivers the best results. But if a linear correction
matrix is introduced, an optimized equidistant wavelength assignment delivers the best results.
The mean achievable precision is sufficient to determine color values below Eab < 0.3.