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Originally Posted by TheReefGeek
So higher K lamps are used for coral growth, and visual appeal.
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What about PAR? I thought the Iwaski 6500k bulb has the best PAR out of all the metal halide bulbs. And, doesn't more PAR equal more growth? The PAR rating from 20k bulbs is significantly lower than that of 6.5k bulbs, which leads me to beleive that lower K bulbs (around 6.5k) give better growth than higher K bulbs (14-20k).