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Abstract—In this work, we explored the changes in the spectral characteristics of the light generated by the luminescent layer containing YAG: Ce phosphor and polydimethylsiloxane (PDMS) in relation to a variable excitation wavelength of the light emitted from the monochromator. We created two types of test samples with a defined thickness of the luminescent layer and with a defined weight ratio of phosphor (cerium-doped yttrium aluminum garnet - YAG:Ce) in PDMS (Dowsil SE 1740). The correlated color temperature (CCT) of the first (second) type of samples ranged from 4387 to 6905 K (from 4923 to 8213 K) for excitation wavelengths of 425 - 445 nm (435 - 460 nm), respectively. The results revealed that this method can be used to design white light sources with an adjustable CCT.