10000 K bulbs emit a longer wavelength of light than 6700K bulbs. To your eye, this means that the colour produced by these bulbs will be closer to the blue side of the spectrum and farther from the red. The impact that you will notice is the quality of light produced will be 'whiter' and less yellow will be visible. I like these bulbs for their aesthetic appeal as well as their accuracy when compared to the natural environment.
As far as other factors are concerned, the Kelvin (K) measurement of lighting (colour temperature) is relevant when you consider the light-filtering properties of seawater, and how they affect the wavelengths of light that actually reach corals in the wild. Sunlight is 5500-6000K light, but saltwater filters out the shorter wavelengths (red-orange-yellow etc.) as the depth grows greater. The actual colour temperature of light that reaches most corals in the wild is greater than those 6700 K bulbs. If you want more in-depth info, read about it in some good aquarium books.
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