gDimScreen
gDimScreen is a screen dimmer Windows 8/10.
Since version 8 of Windows, it is not possible to darken the screen automatically after a certain period of inactivity, at least in family version. gDimScreen reduces screen illumination while allowing you to see what is happening. gDimScreen can be launched automatically at Windows startup (default behavior) or manually.
Download the installer for Windows (8, 10).
If Edge or SmartScreen warns you that this program may be harmful, see this page.
For more information, see the gDimScreen online help (included with the program).