I recommend you use Brighter-Screen Lite if you don't have a big-screen Mac and don't use your Mac for watching movie often.
- Maximum brightness 105%
- Minimum brightness 10%
- Movie mode (same as photoshop shadow effect and useful when you watching high quality movie on fullscreen)
- More F2 (or Fn + F2)
- Less F1 (or Fn + F1)(These are 2 more...
- Bug Fixed. OS X 10.9 Mavericks-compatible.