The Sword and Laser discussion
new program I love: F.lux
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Plenty of things already change the brightness of my screen. Why is this different?
f.lux changes the color temperature of your display. Natural light is more blue, while most artificial light (including candlelight) is warmer. Incandescent bulbs, which we're all used to, become more red in tone when you dim them. But newer LEDs and CFLs don't - this includes the backlight on your monitor. If you're a photographer, you've probably dealt with this, since pictures taken inside at night are always much more brown than photos outside.

That said, I'm crazy. But I'd still avoid f.lux.
Makes your laptop look like it was lit by a tungsten or candle after sundown (reduced color temperature). It's supposed to help you get more sleep at night, and I really think it works. Definitely looks steampunk. It's free and works great on my macbook pro. It sure affects me, maybe because I use my laptop so much.
More info about blue light and circadian rhythms: http://www.marksdailyapple.com/how-li...