Eric, I hadn't really done that much research into LEDs, but I learned a lot when researching HIDs (car retrofit). Here are few things that people are probably not cognizant of:
1) PROJECTION = sending light output AHEAD of you; with slower moving vechicles it's not as key (I believe that it becomes an issue when you're traveling at and above 30 mph);
2) Light in the higher Kelvin spectrum scatter more in the presence of water vapors (or particulate matter);
3) More light right around you means that your pupils shrink and are less capable of picking up light further out (HIDs w/o projectors actually make visibility WORSE)- I think that this is what "snow blindness is about" (though I can't say that I'm all that familiar with snow like others are).