I've been playing with the X-Rite Color Checker Passport and DNG profiles for my camera in LR4.4. So far, the results appear to give me more vivid purples as a starting point for processing, and I like the results.
X-Rite indicates that I could make a profile for given lighting situations (e.g., daylight, shade, overcast, etc), or choose two of the lighting situations and make a "Dual Illuminant" profile. I have two questions:
1) Would the Dual Illuminant profile actually be a compromise between the two lighting situations, and therefor less accurate than using the single-lighting profiles for those images shot in that particular light?
2) I can easily be sucked into making profiles for many lighting situations (e.g., daylight early, noon, late; spring, summer, fall, winter, etc) Would that be total over-kill for landscapes, where I don't have to get "precise" color values, anyway? (I do understand that in very specific lighting situations where I want consistency among a group of pictures it would be good to profile that situation for those pictures.)