Quote Originally Posted by David A. Goldfarb View Post
LCD screens are usually backlit, so switching to a red color theme doesn't usually help, because the backlighting doesn't change.
PCs tend to throw a lot of light just from the chassis. We use one in the planetarium, and I spent a lot of time with tape and baffles , trying to prevent light leaks. Apparently some genius motherboard designed decided that insanely bright green, blue and red leds were just the thing. And let's not forget the way the ethernet port lights up whenever there is activity.