I was just reading over the spec sheet for the bulbs (http://www.ushio.com/Files/UltraArc.pdf)and noticed something that I don't think has been posted on here before: that they should be mounted vertically for the longest life span. According to the sheet you can get 20000 hours if mounted vertically, and only 15000 if mounted horizontally.
Just thought I'd mention it for anyone who is about to mount theirs.
Just thought I'd mention it for anyone who is about to mount theirs.
The problem is that it's VERY hard to keep the arc stable with it vertical. The arc wants to jump around and change colors.
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