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Message: [QUOTE="eebmg, post: 3752451, member: 7548"] 9 K = Kelvin Temperature Scale. All objects at a given temperature have an associated "color" defined by the peak of the Planck Black Body Radiation Expression. Example, the Sun at 5800K is yellow. As we get cooler, the planck radiation peak shifts towards longer wavelengths moving to the red side of the color "rainbow" while hotter objects shift to the blue side. Since the color blue for illumination is psychologically associated with "cooler" and the color red for illumination conjures up "hot", I guess that is how the topsey turvey identification comes about [/QUOTE]