Burnt out another MH, why?

[mark]

Damn, lost another one and this one after only running a month at 9hr/day. Beginning to think Hamilton's are crap.

Though the pendants are mounted in a hood, don't think temperature's a problem. I have a 5" muffin fan in the basement hooked up to some 3" duct blowing air through the hood. Been quite awhile since I took temp reading and don't remember exactly but I'm moving a lot of air and the exhaust temperature air wasn't that much above ambient.