Originally Posted by p5browne
The reason I went to this, I was fed up of calibrating the Greyscale after only a half hour of warm up, only to find doing a complete reading, all the points had all changed in the time of calibrating from 100IRE down to 10. (Yes I realize there will be discrepancies - this is why I do 3 calibrations - First to get all the points within the Ballpark, 2nd to get the settings into the Stands, and finally the 3rd to get the settings onto the Actual Playing Field, then maybe a fourth to put all the settings into the actual Diamond Area). So, was left still in the Ball Park, but not the Stands. Now that a couple of hours have gone by, the settings are finally falling into place. By waiting 3 to4 hours - I'm into the Actual Playing Field, if not the Diamond area within max of 3 calibrations, that also took less time, with less spikes and dips. Maybe it's my sets, but this is what I've found best in my situation. Still looks great on turn on, but keeps getting better as I watch. Have noticed since getting to spec, the viewing is great within the half hour.
OK, I tried this again on the same Samsung LED.
In the first test linked above, I let it warm up for an hour and the x-axis was down 0.002 and the y-axis was down 0.004. Luminance was down by 2.8%. In the second test this evening, I left it on for six hours and x was down an additional 0.001 and and y was down additional 0.002. Luminance was down an additional 1.6%. This is a negligible difference. The more interesting question is whether 30 minutes is adequate. After 30 minutes, x was down 0.001 and y was down 0.003.
Start:........x0.305, y0.327, Y112.9
30 min:.....x0.304, y0.324, Y111.1
60 min:.....x0.303, y0.323, Y109.7
360 min:...x0.302, y0.321, Y107.9
At least on this unit--I could try it on a Sony and and LG if anyone is interested--the bottom line is that the LED display gets slowly dimmer as it is left on for long periods of time, getting a little bluer and redder along the way. However, after 6 hours, the difference is small, a dE in the 2-3 range and a little over 4% dimmer. About half of that change occurs in the first 30 minutes. In my opinion, the remaining half offers just too small an additional change to merit additional wait time, but if you want to wait longer it certainly doesn't hurt.