I'm not sure that you can compare the luminance of an LCD screen to a laser beam in air... You'd need to know exactly how much light was entering the pupil, which is a function of laser power, fog density, etc... That would be one tough calculation! My guess is that the eye receives more light from the LCD panel than it does from a beam in the air. (Provided the beam doesn't actually enter the eye of course!)
I do believe, however, that you can maintain at least partial mesopic vision in a dark room even with an LCD monitor on in front of you. So certainly in the case of a laser show in a dark room, the color perception is going to shift towards blue. How much is the $64,000 question...
I completely agree that this complicates things tremendously. Perhaps we need to collect some empirical data on color balance under various lighting conditions.?.
Adam