Hi,
Well, yesterday I found a fairly major flaw with my video mirrors: the LCD screens go black when they get too hot! This happened to the left hand one, which is exposed to more direct sunlight. This is probably part of the reason why they get darker in bright sunshine -- again the one on the left is often darker and harder to see than the screen on the right.
I may try to rig up a quiet 120mm fan behind them to try yo keep them cooler. Or, if it gets really hot (today is supposed to be hotter than yesterday) then I may be forced to turn on the A/C and that will test my theory...
Bummer. The screens do generate some heat on their own. After it sat in the shade for a while, the screen started working again.