When I swich scenes in blender game my scene gets darker If I run my game scene without the menu scene everything it's fine, but if I first run the menu scene of the game and then get in my game scene everything is darker and my lamps are different than the ones I set.
Make sure both scenes have the same settings (e.g. Shading Material Mode: MultiTexture/GLSL). The BGE will use the settings of the startup scene throughout the whole game.