As long as you don't go darker than what is required, you won't.
Take a look at HD's settings, 2D or 3D, that's what they both accomplish.
If you calibrate brightness using a pattern (AVS 709) you come to the same conclusion. I apologize if the reference was unclear, I just assumed it would be understood. If I'm telling you the brightness you need to achieve a full black screen, one should think that the desired image is in fact a full black screen.