Originally Posted by knnirs
Gray-Scale calibration with the Spyder2Express on a new Haier HL37E LCD TV
I have taken advantage of the excellent work done by those in the AVS Forums, and wish to report my experience with the Spyde2Express colorimeter. Others have expressed concern about the reliability of this instrument, but I believe my unit works very well. I measured the temperature sensitivity sensing Color Temperature of the 60% IRE and find that the reading increases fairly lineraly about 0.1% per degree F., and at a constant temperature of 85 degrees the Color Temperature repeats within +/- 0.2 %. I am setting the measuring time at 300 ms using the option of auto adjustment of the averaging to minimize the variability at low light levels. The total measuring time is less than 4 minutes for the 11 readings from 0 t0 100% IRE
I have measured the Gray-Scale Color Temperature on more than 5 different days, and find the variability to be less than 3% at any of the readings from 20 to 100% IRE levels. I do find that my Color temperatures at 60 and 70 % IRE are about 8% higher then the other levels, and so far I have not found adjustments on the TV to make all of the readings closer to 6500. My question is does this represemt an error in the colorimeter, an error in the AVCHD disc, an error in the software, or a combination.
I think these results are quite good, and I would be interested in reports from others using different colorimeters.
I'm going to attempt to comment on your post, although I'm not sure I fully understand what you are saying.
As far as the Spyder 2 results you mention, it is important to remember that a meter can be repeatable but not accurate. In other words, it can give the same reading over and over (as yours has done), but that does not guarantee that the reading is correct (accurate). In general, the Spyder 2 has been found by many to be less accurate than other meters. It's difficult to say if yours is accurate or not without comparing it to another meter whose accuracy you are confident in.
As for the 8% increase in color temperature, that isn't an uncommon thing. You can pretty much rule out the disc or the software causing the increase. It could be your meter, but I would say that it is probably just your set. You may be able to tweak it in further.