I used a Benq VA monitor (GW2450HM).
However, most monitors these days use LED backlight, which is too bright for my eyes.
For my age, I am really worried about macular degeneration, thus I tried to reduce the blue lights from the monitor.
At first I used some software, like redshift and f.lux. These can change the color temperature of the monitor according to sunrise and sunset times. These are indeed helpful. I can feel my eyes less tired after long use.
However, my working space is located beside a window, and the natural lighting changes a lot during the day. Simply adjust color temperature for sunrise and sunset can not accommodate the rapid change of ambient light. Thus I have set up a system to monitor the light from the environment, and adjust the color temperature and brightness of the monitor accordingly.
I use a webcam to monitor the environment light. The white plastic cap is used as a white balance filter. Then calculate the brightness and color temperature of the ambient light, and called redshift to adjust the brightness and color temperature of my monitor. It worked rather well.
NOTE: If you need precise color, like photo editing or design or publishing, this approach will not work for you.