Originally Posted by SirMaster
From what I am to understand, some colorimeters have their own internal spectro offset calibrations which were set individually per colorimeter in the factory when they were created.
This includes the Spyder4, Spyder5, SpyderX, X-Rite i1 Display Pro, and X-Rite Colormunki.
This means that they can all take a .CCSS spectro correction measured for a specific display type and apply the transformation based on their own individual internal spectro table, and should be more accurate than reading that display with no correction.
From the DisplayCAL documentation page:
Special note about the X-Rite i1 Display Pro, ColorMunki Display and Spyder4/5 colorimeters
These instruments greatly reduce the amount of work needed to match them to a display because they contain the spectral sensitivities of their filters in hardware, so only a spectrometer reading of the display is needed to create the correction (in contrast to matching other colorimeters to a display, which needs two readings: One with a spectrometer and one with the colorimeter).
That means anyone with a particular screen and a spectrometer can create a special Colorimeter Calibration Spectral Set (.ccss) file of that screen for use with those colorimeters, without needing to actually have access to the colorimeter itself.
Sure, you can do this, I am only saying it is not recommended, simply because the i1pro2 isn't a reference spectro. There is no guarantee that your i1pro2 is in any way more accurate than the other user's i1displaypro. I tested a few i1displaypro on LCOS and I certainly wouldn't have been able to know, without a reference meter, which of these or my i1pro2 was closer to reference.
Anyway, no one will die if using a not so great profile, I'm only saying that it's not a great idea to share an i1pro2 profile for an i1display pro on LCOS. A spyder, sure, because chances are the i1pro2 will be more accurate, but an i1displaypro, not in my opinion, at least based on the 2-3 units I tested and various reviews showing how close they were both between different samples (unlike the spyders) and to the i1pro/pro2.
Personally I'd use the factory calibration specific to this meter, or a profile made also for this meter, with a reference spectro.