Would you people hurry up with that High Brightness Display

light leakage and the need by the pilots to jack up and fine tune the brightness on the fly is a major obstacle leading to large cost overruns.

"Design problems and revisions during testing and development are continuing to add to the bottom line. Chief among them have been problems with jitter, poor night vision acuity and light leakage in the helmet mounted display."

http://www.utsandiego.com/news/2014/apr/05/f35-joint-strike-fighter-jet-update/