Nokia Lumia 521

Backlight
Brightness
To make the screen backlight brighter or darker, follow these steps:
1. From the Start screen, swipe left.
2. Tap Settings.
3. Tap brightness.
4. If necessary, tap to turn off the Automatically adjust slider.
5. Tap the Level field.
6. Tap to select one of the following options:
o low
o medium
o high