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ive read that the pigments likely reflect blue light or more precisely that particular spectrum to boost the zoox.just like we use polished aluminium reflectors to maximize the light from the bulbs we use.but as far as a higher k bulb making a coral more colorful is doubtful.it only appears that way because the light being mostly blue you only see blue being reflected back.i once had a bulb burn up and didnt have a replacement and the lfs didnt have one.so i had to go to lowes and buy a 250 watt G.E.the spectrum was very yellow as you would expect,but within just a few days the colors and growth rates almost doubled.so i wouldnt think a 20k bulb of any type could come close to that.although you must consider its the par value of a bulb that is effective and not its color temp.
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