Every now and then I wanted to be able to dim a MacBook Pro screen more than could be done with the keyboard or OS options. I recently found a free utility that will help me deal with the Mac “flashlight” at night. It’s free and works great.
One caveat – there’s a reason Apple didn’t provide this fine grained control. As the screen is less illuminated the contrast is greatly reduced, so it can be much harder to read the screen.