After photodarkening, colored filter glasses obtained from different glass makers show energy relaxation times that depend on dopant components in the glasses. Dopant analysis implies that potassium ions may affect the energy relaxation time shortening. In order to observe dopant dependence of the darkening, laser wavelengths are adjusted to the same absorption in all samples. CdSxSe1-x microcrystallite sizes in this report are confirmed not to affect the energy relaxation times.