On all screens. There are about 14 screens in the art department. I'm not too worried about the screen view, but My customers will start asking whats up any day now. It's nice to have an answer that sound real technical. That way they will say never mind. I know and you know that screen colors are a simulation of the color and should never be used as a "proof" but try explaining that to someone who don't know. Is there a reason they use L*A*B* colors now?
Pantone+ libraries have spot colors with LAB definitions. These are closer to real colors from Pantone. In older versions of Ai, Pantone spot colors had separate libraries with LAB definitions and CMYK definitions with CMYK being the default. To use LAB definitions, one had to change the option in Spot Color dialog (loacted in the flyout of Swatches panel) for each document.
Colors in Pantone+ have LAB values,, which are closer to the real colors, Also these libraries contain newer and updated values.