I've had the same problem with these lights in the unheated half of my barn. Freezing cold they light fine. When its humid, not so much. I actually posted on here about it a couple years ago. The consensus was that the condensation on the bulbs conducts some electricity that would otherwise help light the bulb. The effect seems to be worse on older bulbs.
I tried drying the bulbs with the power on and got a nice little tingle from touching one. So, I'd say that's what happens. I replaced bulbs in one fixture and it lit every time, even when the other five wouldn't.
Later on, I replaced all the rest of the tubes and everything was great. We've had some cool humid weather again here lately. All my lights work fine except for the first one I changed the bulbs in. It would seem that the older the bulb, the more prone it is.
I'm surprised that new bulbs didn't work for you. Were they brand new or just different bulbs? Maybe your building gets a lot wetter than mine.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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