This study aims to clarify color rendering properties for two-color combinations when the spectral power distributions of light sources including LED lamps and illuminance change and also aims to calculate the color rendering values while taking illuminance into consideration. Subjects subjectively evaluated the feelings of the two-color combinations of the test side by comparing them with the feelings of those of the reference side by using the Semantic Differential method. In the results, affective evaluation values decreased for all test light sources when illuminance decreased. However, for the red and green combination samples, affective feelings under 10 lx of the LED lamp (LED-RGB) of the combination of red-green-blue LED are almost the same as those under 700 lx of the other light sources. Also, we tried to calculate the color rendering values while takingilluminance into consideration. There was no correlation between affective evaluation values and the color rendering values at anyilluminance level. The results suggested that the current CIE-Ra, CIECAM02-Ra, and CIECAM02UCS-Ra are not be sufficient when color rendering properties are evaluated at low illuminace.