Thats a loaded question. Really, the 10Ks will generally give the best growth, while the 20Ks will generally give the best color. Both 13Ks and 15Ks are pretty much in that middle. Personally, I like the 14K Hamiltons and 20K XMS. I run 250 watt and 400 watt of both and like them. Both on standard M-58 and M-59 ballasts.
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