I've never calibrated my display to a 5000K color temperature. I've always set it at native or 6500K which usually is the same thing. My 2004 iMac's LCD panel has aged to the point it's native color temperature is now at 6000K. It's still, compared to 5000K, quite neutral looking, just a smidge less blue than 6500K. I've often wondered why there are those that insist on calibrating and editing images using a 5000K display, so I decided to find out for myself by comparing the different color temperatures. Surprisingly I found under 5000K I had to extensively edit hue and saturation in 100's of landscape shots that were OK under 6000K and 6500K. Under 5000K cool colors lost their vibrance and skintones took on a dull looking yellow. I even waited for adaptation to kick in and it didn't. I started investigating the subject of color constancy to find an answer as to why this occurs. I discovered through observation that displays don't have the same spectral characteristics and affect on our eyes compared to viewing prints under let's say a full spectrum, neutral light source like the Solux lamp. This light retains the appearance of hue/saturation in prints despite its dull yellowish cast because of it's inherent ability to bring out the spectral reflectance of the ink and the paper substrate. An LCD can't do this or at least the calibration software isn't building the proper tables to compensate the hit to hue/saturation in color managed images enough so to make the image look correct to the point no further edits are required. Below shows shots taken with my Pentax K100D DSLR of my iMac calibrated to 6500K, 6000K(native) and 5000K using Eye-One Display in order to demonstrate this optical phenomenon. The fourth image shows the overall neutral feel the Solux lamp imbues to a scene due to its ability to bring out different spectral properties contained in various white/neutral objects despite its slight yellow cast on certain objects similar to the white of the 5000K display. Notice the 5000K display seems to have a yellow filter over the entire screen where as the scene lit by the Solux lamp doesn't. This is why 6500K is the ideal color temperature to calibrate to and edit under. It just looks neutral. Just FYI for those that ever wondered about this. Your thoughts and opinions are welcome.