MH for ZOAS

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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