Lux Auto Brightness

Lux Auto Brightness

50,000 - 100,000 downloads

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  • Create brightness profiles
  • Lots of features
  • Auto-brightness detector using light sensor
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Expert's Review

"Smart battery saving"

Reviewed by / Apr 27, 2012

Lux is a custom auto-brightness app that adjust it depending on the brightness of your environment

Smartphones screens are now larger while batteries don't keep it up. For this reason, we need to make an effort by keeping track of those features that leak battery most. The jewel of the crown of battery draining is, of course, screen brightness. Lux is an app that comes to automatize brightness preferences depending on the environment.

It works by linking the brightness of your surroundings (ambient light) with the brightness of your device's display. The ambien light is obtained via the light sensor installed on your device (usually above the display). From the dashboard you can produce linked samples (profiles), toggle astronomer and night modes and access to preferences.

Likewise, you can create different levels depending on the amount of ambient light that camera catches, which is quite util for a more accurate performance. There are other extra features like: keeping the brightness 100% while charging, a handy widget for an easy management (enable/disable automatic mode, switch between profiles, etc.)

The main catch is that its free version is almost a demo since it is quite restricted. Anyway, the app is worth and if after giving it a go you like it, you can upgrade to the paid version which costs just AU $1.49.

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Developer's original description available here
The original custom auto brightness solution for Android.

"To put it simply, Lux kicks the pants off of Android’s stock brightness manager, and it’s worth every cent." - Lifehacker

"Lux is a third-party app that allows you to easily calibrate your phone’s brightness sensor, saving you battery power and reducing eye strain if your phone is normally too bright in dark rooms." - HowToGeek

Lux isn't your ordinary brightness app. It intelligently adjusts the brightness of your display based on the environment you're in. If you step into a dimly lit room, Lux will automatically lower the brightness of your display to make it not only comfortable to read, but to also preserve battery power.

Lux is also able to adjust the screen temperature of your display automatically to make it appropriate for night usage. At sunset, you can have Lux automatically warm your display and switch to your Night profile. If you're an astronomer, you can enable astronomer mode to cut out harsh white light. If you have a root enabled phone, you may even be able to apply these enhancements at a low level with Lux's plug-in system.

Perhaps the best thing about Lux is that you can teach it how to behave. If the backlight is too bright or dim for your liking, simply open the provided Dashboard, adjust the brightness slider to the level you desire, then hold the link button. Lux will use this new 'link' as a reference in future.

Give it a go! I want you to test Lux for more than the 15 minute refund period offered by Google. I understand that some devices may not have the best quality light sensor, and that you may need more time to play around with settings. If you find that Lux doesn't suit you after the 15 minutes is up, you can request a refund within a week of purchase via e-mail - no questions asked.

■ Stable, custom auto brightness with root plug-in support.
■ Use your ambient light sensor or camera(s) to read in ambient light.
■ Subzero brightness for night viewing.
■ Select between Auto, Day, Night, Car and Cinema light profiles
■ Automatic night mode. Change the colour temperature of your display for comfortable night time viewing.
■ Astronomer mode. Adds a red filter to your display to preserve the eyesight of stargazers.
■ Power-user settings such as choice of interpolation, filters, and linked sample editing.
■ Add app specific exceptions via sleep mode. NOTE: This is broken in Android 5.0 due to API changes beyond my control.
■ Customisable fade for backlight adjustments.
■ Tasker and Locale support
■ Battery efficient.
■ Backup to SD.
■ No ads or other nuisances.

Note: Please disable other brightness apps before using Lux. The author is not liable for any issues caused when using this app.

Want Lux in your language? Join the translation project here:

TAKE PICTURES AND VIDEOS: Used to read in luma values if camera input is selected.

DRAW OVER OTHER APPS: Required for night/astro mode.

READ PHONE STATE: Required to prevent Lux from interfering with phone controls in Android 4.1.

MODIFY SYSTEM SETTINGS: Brightness is a system setting, as is toggling the default auto brightness.

RETRIEVE RUNNING APPS: Required to make the 'sleep list' functionality work, so Lux can disable itself when certain apps are in the foreground.

COARSE LOCATION: Required to automatically calculate sunrise/sunset times.

Need assistance? Have questions? Contact me via the 'Send Feedback' button in Lux settings, or via email at

Recently changed in this version

Interim update 3!

- Updated translations
- Night mode bug fix
- Android 5.0 notification theme

Note: Android 5.0 will break 'sleep mode'. Superuser and sideloading will require manual pausing via the notification, pending a workaround.

Lists with Lux Auto Brightness

Some lists where this application appears: Reviewed by Emmanuel Lund.

Comments and ratings for Lux Auto Brightness
  • (74)

    by Johannes Pfrang on 01/11/2014

    Newest update causes soft reboots on app launch on LG G2 and service doesn't start.

  • (74)

    by Chris Lapinsky on 01/11/2014

    So I never had issues until the latest update. Today, I started getting rapid, repeat force closures even after multiple restarts, force stopping, and uninstalling/reinstalling. It appears to be conflicting with Tasker or just the plug in feature in general. Once, I deactivated that option, it started behaving fine after a restart. I submitted the crash report.

  • (74)

    by Tye P on 01/11/2014

    Thanks for giving me complete control over my light sensor. Requires alot of time experimenting to get the optimal settings, but that is the nature of apps like these, so I can't hold that against it.

  • (74)

    by Martin Tsang on 30/10/2014

    The application is great when it works, worked like a charm with my prior phone and tablet, but when it came to version 4.4.4 Android problems arose, application will auto shutdown you need to manually launch it every time or nothing happens, contacted support nothing, even getting a reply is zero contacted twice. Probably you may have a higher chance of winning a lesser prize in the lotto than a

  • (74)

    by Marcus Carbonieri on 30/10/2014

    Every time I refresh the brightness, it reads 10.000lx and turns to max bright. I know it's not a phone issue cuz when I debug the sensor it reads the right LX of the ambient. It started after this new update. Have a nexus 5.

  • (74)

    by Jean-Michel Robiou on 29/10/2014

    (Prior Rating: 4 Stars) The most recent updates have resulted in an inconsistent and frustrating experience. The increments are not smooth, per the settings, and the display will seemingly arbitrarily go complete bright with no filter. That experience can be quite jarring whenever eyes have been accustomed to the light. The inconsistencies have made it so that I can no longer rely on the app to fu

  • (74)

    by Dean Ayala on 29/10/2014

    I switch between android and iOS quite often. Whenever I get a new android device, this is one of the first apps I install.