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I did yesterday to run the battery down, normal use on low. High brightness hurts my eyes.
 
Always full bright unless at night. I like the screen to pop and enjoy it at its best.

Prob one more reason my battery sucks.
 
I don't think I've ever used full brightness unless I was sitting directly under the sun. 25-50% is fine for me. Since the iPhone 5, the screens have been exceptionally bright. When I sit in a dark classroom and have my phone at minimum brightness in my attempt to be discreet, it's still too bright. :p
 
Using the phone in direct sunlight, that's the only time I would use full brightness. In normal/indoor lighting, about halfway. Reading in dark at night with iBooks or Safari: lowest brightness (brighter actually hurts my eyes in a completely dark room).
 
I have always had the brightness setting in all of my iPhones around 25%. Anything more is too bright.
 
I usually have it in medium 50% but this 6+ screen is better I'm only using 1/3 33% brightness.
 
When I'm indoors I put it at 25%-40% brightness. When I'm outdoors or near a huge window it's at full brightness. I always try to keep my screens low as possible because I'm kind of sensitive to light.
 
I always use auto

You know, it actually works. On my 4S I always turned Auto off because it didn't work very well, it took too long to change and didn't adjust enough (still too dim in sunlight). But on a whim I tried it today on my 6 Plus and it quickly ramped the phone up to full (or almost full) brightness when I used it outside.
 
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