auto brightness or not

Discussion in 'iPhone' started by fenderbass146, Jul 21, 2009.

  1. fenderbass146 macrumors 65816


    Mar 11, 2009
    Northwest Indiana
    if i always have my brightness in the middle. Is it better to have auto brightness on or off? To save battery
  2. pelicanflip macrumors 6502a

    Jun 24, 2009
    Auto brightness can help/worsen your battery.

    Think about it this way:

    In bright light, it'll be dimmer, which saves battery life.
    In low light, it'll be brighter, which drains battery life.

    If you're that concerned about the brightness draining your battery life, just set it to a low brightness all the time, and turn up the brightness whenever you need it.
  3. sgiles1 macrumors newbie

    May 23, 2008
    I see what your saying, but isn't it the other way around? Gets brighter in bright environments and dims in dark environments? I find that it dims too much in the dark and I turn it up a bit.
  4. pelicanflip macrumors 6502a

    Jun 24, 2009
    Really? I dunno, when it's cloudy outside or been in my pocket and I take it out, my iPhone brightens up to compensate. When it's nice and sunny out, I don't notice it getting any brighter.

    Maybe that's just me...
  5. actorkid macrumors 6502

    Feb 26, 2008
    yeah you do have it backwards

    think about it. When its dark, you don't need very much light to see something since everything around it is dark, but when something is drowned out by a bright light, you need a super bright back light source to compensate
  6. pelicanflip macrumors 6502a

    Jun 24, 2009
    Ah, fair enough.

    I guess when I take my iPhone out of my pocket, it was darkened because it was in a dark environment (my pocket). In turn, it brightens up due to the outside light, which is much brighter.

    Tadaa, logic ftw :)

    Thanks for clearing that up :D
  7. Small White Car macrumors G4

    Small White Car

    Aug 29, 2006
    Washington DC
    I think you're wrong.

    From what I can tell, putting auto on lets it adjust the light up to the level you've set. It can dim it lower, but it can't raise it brighter then you've set.

    Thus, it can either help (if it dims) or not help (if it doesn't dim) but it can not hurt battery life since it can't go above the point you've set.

    Has anyone seen otherwise? I just played with it for a minute and couldn't get auto-brightness to ever make it brighter than my current setting.
  8. -aggie- macrumors P6


    Jun 19, 2009
    Where bunnies are welcome.
    I think you're right, but my head hurts after reading through this thread. :)

    I just took it into a closet and then out and then under a lamp and I didn't notice it getting brighter than my setting. Does the manual explain this?

    Because of this thread, I lowered my brightness setting to 50%, since I had thought that having auto would lower/higher it as needed. I had it at about 75% b4.
  9. danpass macrumors 68020


    Jun 27, 2009
    Miami, FL
    that's been my experience. it only auto-brights up to the setting you have.
  10. pelicanflip macrumors 6502a

    Jun 24, 2009
    Hmm, never noticed that.

    Still, the brighter you set your brightness setting, the more of a chance you have of increased drains on your battery life.

    To conserve battery life, you can keep auto-brightness on, but lower your original brightness settings.

  11. bbydon macrumors 6502a

    May 18, 2005
    wow this is confusing....
    mine is just on a low setting with auto brightness. They only time it sucks is when i try and use it like a flash light....its just a tad to dim. I need to download one of those apps i keep hearing about.
  12. Nanook macrumors regular


    Dec 26, 2008
    LA, CA
    I have auto-brightness off just because I find the fluctuation annoying, same as my MBP. I always have brightness at about 25% or a tad lower, and hardly ever need to turn it up, except if it's in direct sunlight. In fact, in really dark environments, I wish both went a little dimmer, as the light hurts my eyes. I do have lighter eyes which tend to be more light-sensitive, though.

    I suppose having it on would impact battery life a little, as the light sensor needs power, but I would think it would be negligible.

    Of course, being JBed, SBSettings makes adjusting brightness on the fly a snap... ;)
  13. Vidder macrumors regular


    Jan 10, 2008
    New Jersey
    Does anyone's battery really every completely drain? I mean, i find it odd that people even worry about it unless they are using it like ALL day. It always seems that I am close enough to a possible charger to not have to worry about the battery depleting.

    With that said, I lower it all the way at night so I don't hurt my eyes when I wake up in the morning. During the day, i keep it at about 90% because the colors and clarity are so much better at a higher brightness and wouldn't want to NOT have that for a fear of draining the batter, which in MY case is almost impossible.

    1 - To answer the thread question: I keep my auto-brightness off. Its annoying.
    2 - It gets brighter in more light, and darker in less light.

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