Originally Posted by Dj Dee
I don't understand you, but so you understand I used for this measurements I picked a Profile Natural , D65, gama 2.4.not touched any settings.
OK, got it, I think that perhaps goes some way to explaining it.
Because of the way these units work internally with their CMS and the gamma / colour tables for factory calibration / autocal it doesn't make sense to report that comparison of high vs low lamp I believe. Because you don't know the state of the internal calibration tables.
For me the really useful contrasts are probably;
1) Uncalibrated optical engine contrast - this is measured in Profile off with all processing disabled. You would expect high vs low lamp to be very similar, unless the extra lamp heat or higher rate of cooling has some effect on the panel contrast. For my X7900 at -7 the difference between these two modes is pretty small - around 5-10%.
2) Calibrated D65 optical engine contrast - this is measured in Profile off with just RGB sliders adjusted to bring peak white to D65. This is the contrast you can get with an external 3DLUT.
3) Fully calibrated contrast in specified modes - where it is probably best to follow JVC autocal and then calibrate via onboard CMS.
I think it is probably a waste of time reporting / measuring differences in contrast for high vs low lamp if the above aren't controlled - you could literally be measuring almost anything!