I ought to know this, but ...
The retina screen on my MBP seems very bright, especially early in the morning when it is still dark outside. But I cannot seem to find the control for setting the brightness on my rMBP.
I have looked in System Preferences but it is not under the Display nor the System Power icons. I have also looked under the Desktop/Screen Saver and General icons. I have double-clicked on the screen to bring up the screen display controls (which is where it is on the PC). I can't seem to find it anywhere.
I am embarrassed to ask but where is the control to lower the screen brightness?