Kelvin degrees is a measure of color temperature. The color of the light emitted by a flash is rated at 5500
degrees; it is designed to imitate noon daylight. If the flash produces light that is 6000 degrees Kelvin, it
has a slight bluish tinge. If it is rated at 4800 degrees, it is slightly warmer, or more yellowish, than white
light. - http://www.betterphoto.com/article.asp?ID=24
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