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I just changed my lights from compact fluorescents to MHs last night. As the MH fixture is used I was surprised that they MHs shut down on there own. Power switches on Etc. This morning they both came on after tightening the bulbs a little more (E39 mogul base). I also added a small fan in the area of the ballasts.
As your system has HQI bulbs you could try switching bulbs to see if it's the bulb or the ballasts. It could be in the connections at the bulb or else where. You do know not to touch the bulb as the oils on your fingers will cause the bulb to fail. I use a paper towel.
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