MH bulb

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Personally I like the XM bulb that I have over my 20gal. Its a 20K 250W. Here is a neat page showing how different brand bulbs of difference spectirums appear. Just pick one you like visually the best for your 175W ballast. Just remember you need to match the bulb with the ballast as far as wattage.

http://www.cnidarianreef.com/lamps.cfm
 
awesome link thanks i will have to agree with you on the xm bulb looks the best. thanks alot
 
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