The results of the experiment in which 19 patients were examined by means of Farnsworth-Munsell 100 Hue test are presented in the article below. It has been shown that for normal trichromats the total error score (TES) depends on the illumination spectrum. For the TL 84 type lamp the TES is notably higher than for the D65 type. In second experiment the patients worn spectacles with the Hoya Hi-Vision LongLife BlueControl lens coating. As it turned out, selective filtration of the harmful blue light did not affect significantly the results of the Farnsworth-Munsell 100 Hue test.