Certainly. The shots are provided below. You're right, the max does go higher then 1, but 20 is too much for my setup. It could be graphics card related. I asked a few in my guild to try it out and they all reported it was way too bright except one.
This is the default, ambientmax=20
This is normal with Night Vision off, ambientmin=0.3
And this is what I like, ambientmax=0.7 although its just my preference, provided for comparison.
Thanks,
Leo