Dark Mode and Night Mode Screen Theme

[Dark mode][1] is the app that I used personally and I found it as a very good light dimmer .you can search it also with Dunkel and get it free.

There are several night mode themes that will work for the brightness control and light dimmer. Screen brightness is the harm for your eyes while you are using the phone for several hours continuously you will get you so tired.

[Night mode][2] will bring your phone brightness to a moderate level and hence give your eyes a soothing and comfortable environment.