It's really a personal choice. With the PC actinics, the 10k wont be so yellow. 10k is going to give you the most PAR and the most growth at the expense (to a small degree) of color. 20k will give the best color with slightly less growth and typically has less PAR than the 10Ks, but more than 14k or 15k. I like the blue look, so I'd go with the 20K, but any of them will be just fine.
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