I had an opportunity to attempt to measure the lag (delay) in a new Samsung UN60C6300SF 60" 1080p 120Hz LED-LCD HDTV and found by "scientific guessing" at the delay - it measured almost 200->300 milliseconds in Standard mode with Auto Motion Plus enabled and even 100 Milliseconds or more in GAME mode. As yet I don't know why this is true but many gamers are complaining about Samsung HDTVs for having high lag - to them, anything over 50 milliseconds can cause them problems in FPS games. Most professional studies of overall flight simulator lag - measuring the delay from a sharp yoke pull to the onset of motion of the graphical horizon - should be no more than 120 milliseconds in order to have good control without the chance of Pilot Induced Oscillation at the runway threshold during landing. We tried to measure this by having a regular monitor running in clone mode right next to the HDTV while we rotated the FSX image in heading during SLEW mode or by snapping the view from straight ahead to 90 degrees to the right or left. While this isn't as careful a measurement as desired, we didn't have a program to drive the heading change that could send out an electrical signal and then a photodiode on the screen - that's what is needed - but we could easily see the HDTV image act as if it is buffered and finally catch up to the monitor image. I am sure that for most of our personal simulation enjoyment, more than 120 milliseconds is OK (there is already an approximate 50 millisecond delay due to FSX, don't forget, and the TV lag is in addition to that) but all I am calling attenton to is be sure to scan the forums for the HDTV that you are considering and see if there is much discussion about the lag in GAME mode.

Good post. I finally decided, due to circumstance not to get a 55" 3D HDTV. I feel a bit better not making that decision. The latest and greatest HDTV will be out soon, interesting to see if there is any improvement in that department.

I found on a gaming forum a way to accurately measure the video display lag from an HDTV - it uses the Wii game called Rock Band 2 and the simulated guitar that has a microphone and a photodiode to measure both the audio and visual delays. The system that I mentioned in my first post wasn't quite as bad as I had thought - 80 msec. for GAME MODE=on and 120 msec for GAME mode off. While the gamers have talked about the Samsungs as the worst for delay, they all recommended to actually measure it since there are many modes of operation.