This is a helpful tip by our good friend and master photographer Charles Cramer.
Lightroom 5 now allows for the eyedropper readout to show Lab values! Lab is a color model that separates the color information from the luminosity. Let me explain why I think this is wonderful. Since I believe that perception of colors and tones on a monitor can be deceptive, I like to move the cursor into the image to see what the numbers tell me. You can't always trust your eyes,