Thread: XM 250W DE 15K or 20K?
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Old 10-12-2008, 01:41 AM
Abbyreefer Abbyreefer is offline
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from what I've read teh par rating for some reason on the xm 20k's are better then the xm 15k bulbs. heres a link.
http://www.reeflightinginfo.arvixe.c...m_orderby=PPFD
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