I assume the brightness % values are guesstimated. I keep mine around what appears to be 20-25 on the slider bar. No problems there. I don't get how you guys could even see anything on the screen at or under 10%.
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Under 10 is too low for me. I have really good night vision, so once my eyes adjust to a dark room or something - the stock, low, auto value of 90 is just way too bright.