D65 is not an equal energy radiator; its x,y coordinates are x=.313, y=.329, with a pleasant aquamarine hue. Equal energy, or flat spectrum would be x=.333, y=.333; around 5454K. While Illuminant E gives the widest possible gamut for a given set of RGB primaries, it lacks blue and especially green when compared to the source of light our eyes are tuned to, the Sun, which has an average surface temperature, and thus a color temperature of 5778K. This is the reference white point of astrophotography.On more question: most people say to go with the color temperature warm for the pana plasmas, but when comparing to my eizo monitor that runs a 6500k i thing warm is a little bit too warm, while normal is a little bit colder compared to my eizo mintor.
Despite what you see on the science shows, the Sun is white, actually peaking in the green. It only looks yellow from Earth due to atmospheric scattering of blue light.