Interesting you said this. I have gradually nudged mine down *below* 20%. I was at first doing this to see how it would affect battery life, but, ironically, every time I made a reduction and then returned to the home screen (or went to read something on currents, for example) I kept mumbling the same thing to myself: Jesus that's
still really bright. So I'd go down another notch and so on. At any rate this has left me wondering how, with my brightness set darn close to "0", this screen is still so exquisitely usable--even pleasant, at least to my eyes. When I set my iPhone 4S to a comparable level I can barely read *anything*...even indoors. I'm assuming it must have something to do with the backlight, which is independent of the brightness settings? Not sure cause what do I know about screen technology. But the upshot is I don't really feel as though I'm "losing out" by keeping the screen at 15%. It still seems rather attractive to me: and no, I'm not a masochist
Anyway, between a low screen brightness setting and juice defender plus, I've got my battery to give me about an hour and 10 minutes for every 10% of charge, and that's with moderate to heavy usage (that means surfing, streaming music, etc--not video, but with the screen awake *most* of the time for that hour and 10).
Haven't really tested standby time yet, cause I can't stop fiddling around with this ridiculous device lol.