Properly Exposing Images on a Bright LED Monitor?

[Mosephus]

Any tips for giving an image for print a proper exposure when working on a Bright monitor (in my case 27in iMac)?

I don't print many pictures, but last time I got test prints back my images tended to be under exposed. I know I can dial the brightness back but how much is too much either way?

[KJ Smith]

There is an article hidden somewhere around here. It teaches you how to do a test print.

But from what I can tell, after making test prints in LR3, try pushing the brightness up +20.

[Rson]

There is a program to dim the monitor....maybe called window shade??????