Unit Shaders

Just a basic question.

My manual is long gone. I'm trying to get selected units on the battle map to look less brightly lit when selected (looks as though they're carrying flash lights). Does keeping Unit Shaders checked help, or should it be off. I think that the UI in preferences has something to do with it too, but I'm not certain.

Any one know??

Thanks

Turn off Bloom maybe.

Edit: Wait, hah, wrong forum. I must've clicked a wrong link or something, thought this was M2TW related. Sorry, not sure about RTW.