What DS light setting do you use?

I alternate between two and three, depending on the lighting, and how much battery life I have left

Majority of the time it's on the highest setting, but at night I usually bring it down to like 2-3. And I usually also play when I have it attached the charger.

usually at the lowest and sometimes at the 3 level (i think playing 3d games on the brighter screen make the game look a lot better than the darker screen) :)(sry if the english is bad

depends