android+brightness+app

android app that adjusts display brightness depending on time of day

Lux auto brightness https://play.google.com/store/apps/details?id=com.vito.lux&hl=en

There's also AdvancedBrightness, Locale, and Tasker. http://android.stackexchange.com/questions/5830/automatic-adjust-brightness-through-out-the-day

http://www.computerworlduk.com/advice/operating-systems/3315694/the-best-android-apps-for-boosting-battery-life/ There's also JuiceDefender