XM vs. Ushio bulbs

[Bartman]

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.

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?