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Originally Posted by Gools
I had Ushio's and now XM's. The XM's are far brighter, but have had a couple bad bulbs. With the ushios I feel I have a more stable bulb when it comes to colour temp. But they both are good bulbs. My corals haven't changed under one or the other.
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Thanks for the feedback. What kind of ballasts were you running these bulbs on? When you had bad XM bulbs were you able to return them?