It's nice to have three monitors for a lot of screen real estate but the lights from the screens can often be overwhelming, especially at night. I installed a 3 x 10-inch LED strip behind the monitors which give a nice ambient light behind the screens.
This simple app runs in the background and watches system monitor state in Windows 8+. When the monitors turn off, it sends a command to Vera to turn off the light. When the monitors come back on, the backlight is turned on again.
Tested with a VeraLite home automation controller. You will likely need to change the
IP address and
DeviceNum parameters in the
OffUrl variables to match your setup.