Agreed that the difference is like night and day. I also remember the black of the green-on-black terminals was "lighter" somehow, so that there was less contra

Agreed that the difference is like night and day. I also remember the black of the green-on-black terminals was "lighter" somehow, so that there was less contrast between the black and the green. The lower contrast definitely saves on my eyes. I approximate this in iTerm2 by setting my background to RGB (0, 39, 0), and foreground to RGB (26, 223, 0). Probably not perfect, but I found it works fine with a MBP non-retina built-in as well as an external LCD.