Indeed, Max Angle, this is one of the switches that for me has only one position: max bright. Why anyone would want to turn it all the way down after flight baffles me. It does no one any good and it just puts an extra hole in the proverbial swiss cheese.
Slightly off track, some maintenance colleagues (for all of whom I have a deep seated respect) have the habit of switching off every single switch in the cockpit. So yes, last time I found out in the air that my radar screen was not showing any returns was after a night of heavy maintenance...
Not passing the blame, just an observation.