One of the sneaky things about sun damage - especially in one spot - is that you don't realize that the sun has gotten around a barrier (shade cloth, blinds, etc.) for a few minutes unless you happen to be there when it is happening. I had that experience... in my greenhouse (which I thought was properly shaded) I found a burned spot on a plant, nothing on surrounding plants. I was completely puzzled. It was only when I walked in there at 10 AM on a hot day (so that the vent was open) did I see the light beam. For probably 5 minutes that spot was getting unfiltered sun from the open vent, the rest of the time everything seemed normal. (And on cooler days, the vent was not open at that time, on hot days at other times of the day the sun didn't hit the spot where the vent was open) That 5 minutes was enough to do damage.
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