Display is under Windows XP a lot Brigther

My Macbook Pro (LED) Display is under Windows XP a lot Brigther then in OS X.
When i sitting Outside, i put the Brigthness under OS X to Maximum to see anything, under Windows Xp ist enough 75%. The Display is Calibrated.
Someone know a sulotion to get the same Brithness as in Windows?

Perhaps try turning off "automatically adjust brightness" in the Displays pref pane? I don't know for sure, but I suspect that doesn't affect Windows (if you're running Windows in BootCamp), which might account for the difference.

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