Standard viewing condition for prints is specified in ISO3664, in which the illuminance level of 2000 lx±250 lx is recommended to be used for critical color evaluation. On the other hand, 500 lx±125 lx is defined as viewing illuminance for practical appraisal of prints. A question arises whether 2000 lx±250 lx is required to evaluate the colors of prints, because such illuminance is rare in our environment. In this study, in order to evaluate the adequacy of the high illuminance, we investigated human color discrimination performance for hue, value, and chroma under different illuminance levels, 500 lx, 1000 lx, and 2000 lx. As a result, hue discrimination was best under 2000 lx. However, value and chroma discrimination did not differ in the three illuminance conditions. One of the reasons for this is probably due to difficulty in discriminating between value and chroma of color.