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The K of a lamp used to refer to it's general hue with 6000k looking a little more blue than a 4500k, but now that the manufacturers invent their own labels like 10000K and 20000K there's little relevance to the kelvin of the lamp.
In the wild you can see SPS corals side by side, each getting exactly the same light, but exhibiting different colors for each (small) variation of SPS.
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