I ran a Vertex for a couple years with both Phoenix 14k and Ushio 10K DE lamps and I never had a problem with it. A year or so back I sold it and went to the current PFO HQI ballast so I could get the extra 10% or so out of my HQI lamps and was running that happily for a while. Then recently I picked up this other Vertex ballast when I was troubleshooting my fixture and it's only this last ballast that I've had issue with, so I don't believe there's a compatibility issue between the Vertex electronic ballast and these lamps, but simply that I've got a slightly defective unit, and possibly you do too. Either that or there are different generations of the ballast that I'm not aware of which run differently. Too bad you're so far removed, you can't just borrow a buddy's ballast to see how your lamps run. Good luck
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