What is the difference?

Posted by ReefLounge_Admin on Oct 25, 2009 in Reef Tank Lighting | 0 comments

What is the difference between these two bulbs. I do have an Ice cap 660 ballast, so which one should I get?

http://www.drsfostersmith.com/produc…id=13825&r=558

http://www.drsfostersmith.com/produc…id=13824&r=558

What is the difference?

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