I just went and looked at it all again. I believe the best way to describe it would be 'gain'. Look at the DW. It has the second (oops!) highest Luminance value and is purported to have a gain of 1.24. I am unable to measure gain at the moment - maybe next week. But Smokey's kind of turned me off of gain and on to this way of comparing screens. And now I see why!
So when I get my block of magnesium carbonate, we can use it's values against those of the panels to determine gain, if one was so inclined.
Keep in mind that all the values above would have to be re-done as I'd have to set up the spectro on the tripod and ensure everything is the same distance from it and the same angle. It is something I plan on doing in the future!
But after I'm done with this I must help a friend with readings on some Pearl and Pearlizing topcoats!
mech