Originally Posted by nicholc2
Yes an i1pro. Right now I would definitely expect fluctuation since my tv is brand new and the bulb hasn't settled in yet.
The reason I ask you about your 2010 is because there seems to be a divergence of opinion on what is the typical range of fluctuation one should expect on tehse sets in average dE from one measurement of the grayscale one day to another measurement on another day on a set with the has a stable "broken in" lamp.
My set seems to "wobble" both on peak Y and on RGB balance beyond what I think should be acceptable. I have described the behavior in the display calibration thread for the Mits set in detail. Another poster who has owned 3 generations of Mits DLP over the last 3 years says he has seen the same behavior on all 3 gens including after light engine replacement.
In my case green seems to go up and down effecting total luminance but also causing color balance to shift from nuetral to greenish while still maintaining close to 6500k average temps. I can set grayscale to have very low dEs and a day later they will have risen, another day later they have fallen back some, but generally they rise until they get to around dE of 5.0 average then oscillate between say 2.5 average to 5.X on any given day.
You can see the difference in grayscale and luminance as it moves toward the more or less accurate. I can adjust back to the low error, but it will go back to the higher range and oscillate regardless. The other forum member claims this is characteristic of Mits DLPs. That is why I was hoping to see jut how the 2010s behave over time.
My set will measure differently on grayscale everyday, despite great care to eliminate variables like set and meter warmup. My visual experience matches what the meter tells me. I recall you mentioned your bad lamp experience, and maybe my expectations are too high but Mits hangs the ISF branding on these sets so I believe we should expect them to calibrate to 3.0 dE or less on grayscale and 1.5 CIE 94 dE on color gamut as those are the standards. The sets should be able to maintain those numbers for a reasonable period of time. A month or two at least on a 500 -1000 hour lamp. Frankly I am completely okay with a 2.0 dE measurement on primaries as long a the Y errors are minimal.
I am using an external VP with full CMS and I have a much more granular set of tools to adjust then what is provided in ADV. People using other display technologies routinely get color down to 0.5 dE and hold it using the Duo VP. Regardless of whether I use ADV and no VP or use the DVDO Duo to set grayscale I still get the same floating green levels.
I have made a service call to Mits. My set has behaved this way since I got it last January. I have no idea what parts they intend to bring on the service call. My guess is that the lamp/lamp power supply and ballast system are not robust enough to run the lamp at bright. The 2010 uses a different part number lamp. I don't know about the lamp power supply and ballast as I a have not seen a service manual but those parts may have been changed as well. I am using a USB powered fan to force additional fresh air into the lamp fan intake vent to help stabilize lamp temps.
I am not so concerned about meeting those ISF dE targets on color gamut as I am with getting the set to maintain grayscale calibration and gamut for awhile. It seems like everytime the set is turned on the grayscale behaves differently even though the settings have not changed. Now I can see and understand some drift over several hours of continuous running but it nowhere near what I see from day to day.