Hi Rowland. Yes, I've found I can go to 5 minutes with air temp in the 20's, maybe longer with air temp in the teens, probably longer in single figures, but I will have to wait for winter just to get into the teens in another 5 months!
At the moment amp glow is too bright longer than 5 minutes. Not that I get 5 minute clear spots between clouds anyway in summer. The joys of living in the tropics, not.
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