This article explains how to write a batch file to adjust a monitor's brightness levels

To write a batch file that dims the display on a Windows computer, you can use the following steps:
 

1. Open Notepad or any other text editor.
    

2. Type the following command into the text editor:

Or copy/paste below code:
powershell (Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1, 10)

The number "10" in this command represents the brightness level you want to set, with 0 being completely dim and 100 being maximum brightness. You can adjust this number to your preferred dimness level.
 

3. Save the file with a .bat extension (e.g. dim_monitor.bat).
    

4. Double-click the file to run it.

This batch file uses PowerShell to access the Windows Management Instrumentation (WMI) and set the monitor's brightness level.

• Note that some monitors may not support this functionality, and you may need to adjust the command or use a different method to dim the display on your particular monitor.