D65 plays a critical role in color reproduction, specification, and characterization. Displays commonly use D65 chromaticities as the white point, but many studies shown that a stimulus produced by displays having a slightly higher CCT was perceived to produce neutral white appearance. Moreover, our two recent studies found that LCD/OLED displays need to produce a stimulus having a slightly higher CCT to match the appearance of a high quality D65 illuminant that was produced by 14 channel spectrally tunable LED device. We hypothesize that a higher CCT required by displays to produce a neutral white appearance was caused by the CIE 1931 Color Matching Functions and a D65 illuminant can indeed produce a neutral white appearance. In this study, we use the 14 channel LED device to produce a series high quality daylight simulators. The observers generally selected the stimulus having a CCT between 6346 and 6906 K to have a neutral white appearance. When using an LCD display to match the color appearance of the selected stimulus, the average CCT was between 7209 and 7943 K. Such a finding supports our hypothesis and suggests the importance of color matching functions in display specification and calibration.