I always read the 'lab reports' in various published display reviews. A very interesting one was of a Samsung DLP (non-LED lamp). It calibrated beautifully, the grey scale was a straight line for all practical purposes.
Colors, were amazing, contrast was decent if not the 'bomb', etc.
Only one 'glaring' problem, it was just too damn bright. They searched all the user settings and their was none for any lamp level or iris adjustment.
They could not recommend the display for a dark environment as splendid as it was in all other aspects.
http://hometheatermag.com/rearprojec...ce/index6.html
Then they found an iris adjustment in the service manual. The author of the review added the info to a blog he has on displays.
So far I have not been able to find it, and inquired out of interest. Many of the blogs are quite informative, BTW.
Well post if I do.