Auto brightness on or off for battery life?

Discussion in 'iPhone' started by chillip, Oct 5, 2017.

  1. chillip macrumors 6502a

    Mar 16, 2013
    I was always under the impression that turning auto brightness off was best for battery life but under battery settings it says I should enable it for better battery life. Surely the sensor will constantly be using power when checking lighting conditions for auto brightness? Thanks
  2. abhishekyadav1 macrumors newbie

    Jul 30, 2016
    If this is true then I m sure it's best piece of information
  3. Givmeabrek macrumors 68040


    Apr 20, 2009
    Keep it on. No point in having a bright backlight in dim lighting conditions. Of course if you want the screen to be dim all the time then turn auto off and dim the screen way down. Pretty silly. The battery lasts all day anyway....
  4. BigMcGuire Contributor


    Jan 10, 2012
    This... Couldn't live with it off. That said, even with auto-brightness on, I do a lot of reading in bed at night and often pull up the bottom drawer to turn brightness all the way down cuz it is always at 10%.
  5. Newtons Apple macrumors Core

    Newtons Apple

    Mar 12, 2014
    Jacksonville, Florida
    The backlights use way more power that the sensor so let the auto brightness do its job!
  6. macrumors 604

    May 26, 2016
  7. Vanilla35 macrumors 68040


    Apr 11, 2013
    Washington D.C.
    Thea idea is if you're one of those people who let the phone stay bright in a more dim environment, then you will save battery life by having it on. Basically it assumes most people are dumb, and will not adjust it manually to match their environment, then you will save battery life by having it on.

    I personally find auto brightness very good on iOS EXCEPT for when in a very dim environment, and it will not go below 10-20%, like others have noted, I also manually adjust it at this point. Thank god that does not kick off the auto brightness setting, as I do it daily.
  8. macrumors 604

    May 26, 2016
    Yeah I do exactly that.

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7 October 5, 2017