If your screen is so bright and you want to reduce the brightness. You need this application called "Screen Dimmer".
"Screen Dimmer" application helps you adjust screen brightness to any level. You can adjust brightness from 0% to 100% with this app.

Features
- Adjust screen brightness to the minimum.
- Auto start after reboot.
- Able to open application via notification bar.
- Stable, lowest memory usage, minimum battery usage.
- Easy to use. Just choose percent of brightness you want to set from seek bar.
- Smallest size of application.
- No permission required.
- Emergency button to turn off the service in case of black screen in some devices or accidentally set the brightness to 0%.