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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