I've had a great deal of feedback on the brightness of things, and there's a test patch in Bleeding Edge right now that potentially addresses some of them. It 'should' be safe to opt into, but I do recommend that you backup your world first.
http://steamcommunity.com/app/254200/discussions/0/135508031949578329/
I'm aiming for an update to mainline early next week, that should include a number of fixes based on the recent feedback to Patch 16.