I was looking for something to turn a computer screen red when imaging and came across this program that works really well.
www.otelescope.com/files/file/19-backyardred-12/
The slider at the top of the screen allows you to adjust the brightness and how to switch back to a normal screen.
Paul
The following user(s) said Thank You: Until_then-Goodnight!
Another alternative would be to turn on the high contrast in windows 10 . Set everything to red and save it. You can then turn it on/off by pressing Shift + ALT and Print Screen key. You also have to adjust the screen brightness (which would also save your battery) , see the link below.
  