During the day, computer screens look good—they're designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun.
Say what? Look like the sun? CFL or LEDs are just white light sources. Most of them are not even full spectrum and they're not mean to 'look like the sun' at all.
All this program did was cast a yellow/pink overcast over my screen. If you're doing some graphics work, this is useless.
If you're on a Mac and your eyes feel tired from a lot of light late in the evening, give this a try: http://docs.blacktree.com/nocturne/nocturne