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Originally Posted by AC33
I was under the impression that the proper spectrum was around the 6k region, the colour temp closest to the sun? And that we only use higher K bulbs because they are more visuallly appealing, but dont offer the same amount of growth as 6k bulbs?
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Different wavelenths of light penetrate the water more/better. So as you go deeper, only certain wavelengths are present, or in high concentrations. So corals are not exposed to 6K sunlight, they get "filtered" light, with higher concentrations of blue light because it penetrates the water better.
So higher K lamps are used for coral growth, and visual appeal. Different corals, depending on where in the reef they are, will "want" different spectrums of light. They can also adapt though, and change out the symbiotic *cant remember name* and get food from different spectrums of light.