Bought Deus Ex GOTY edition recently and quickly realised how dark it was. I was going for a stealth run so I'm going to be in a lot of dark places, which makes it incredibly annoying when I realise I can't see anything.
I tried adjusting the brightness in the menu but it only changes for a second before going back to default. It looks the same on max brightness as it does on minimum. It's making the game more difficult than it should be.
Yeah, I can use the light augment thing sometimes but I have to use it constantly to see where I'm going, and it's kind of a problem when I don't want to be noticed.
Anyone know how to fix this?

This person had the same problem as you, and solved it by changing the renderer from Direct3D to OpenGL, so it would be worth having a look at changing your rendering engine if you selected Direct3D when you were installing.

http://www.gog.com/en/forum/deus_ex_series/my_game_is_too_dark