There is a wonderfull video card tweak program called Powerstrip. With it you can assign hotkeys to adjust the gamma/brightness/VGU speed during the game. Do a google search for it and you will find it. I originally downloaded it becaude I wanted to overclock my video card with it but it has all sorts of neato features like RAM manager gamma bright and color adjustment etc. The only thing is that for somereason when NS starts it starts with my default gamma settings (which are too low) but i run my game in a window, and if I grab the top of the window and move it, it corrects the gamma back to the brighter settings.
Check that out it should help you out and you may even be able to squeeze a lil more out of your system ;]
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Check that out it should help you out and you may even be able to squeeze a lil more out of your system ;]
lightgamma -10
texgamma -10
gamma 3