Blue has the worst qualities of all the visible light. Actually, violet would probably be worse, but there is so little produced by a halogen bulb you cant really count it. So, assuming that, if you remove blue light from the lamps, you have yellow, or more specifically, selective yellow. The French required this on all cars up until the early `90s. To my knowledge there have been no actual tests proving yellow is better on a normal road then yellow. The yellow light would throw off the colors of the surrounding objects so that could be a problem to some drivers. However, putting any kind of a filter over a bulb will reduce light output so for visibility, that is bad.
Now, back to normal bulbs (HID, HIR, or halogen) what will you get if you take all the light that is escaping above the center of the lamp and put it down on the road? Doing this will reduce the reflectiveness of overhead street signs. However, you will have more on road visibility. Plus, if you arent letting the light above center, you can run brighter (HID, HIR or H9 halogens) bulbs and not dazzle the oncoming traffic with your glare.
Removing the light above center is what the rest of the world has done, leaving us in the dark, so to speak. E-Code lamps, JDM if your on the other side of the road, or a harmonized beam pattern is perfect for doing just this. IMHO, the only drawback to these beam patterns is to oncoming traffic under certian situations. Picture yourself driving along a dark, two lane road. Coming towards you, in the other lane, is a HID powered BMW. Your eyes are adjusted to the lack of glare coming out of the BMW. The driver of the other car goes over some train tracks, and for a breif instance, you find yourself under his cutoff. You will be temporarily blinded, but just for a fraction of a second.
I have a few pics showing exactly this. I have more, but they are on the other computer and I dont want to go sign it on right now. PM me if you want them.
In front of the car, above the cutoff, oncoming traffic will see this:
Notice how the snow doesnt light up until it falls below the 25" high cutoff? This makes driving more pleasant in snow or heavy rain. Your light doesnt have a chance to bounce off of the water droplets or snowflakes and come back and blind you.
But, imagine youself in the scenario I mentioned before. This is what happens. Granted it is an extreme because the camera is on the ground. Most vehicles dont have four H9s lit up while the car is in motion either.
Those beam pics are basically what each and every one of Milans buyers are experiencing now. I went a slightly different route to fit them onto my pre-98. Milans customers dont have the same housing that they are using for their lowbeams in the foggie position either.
You can find more info about what you are mentioning here:
http://lighting.mbz.org/, specifically the
blue bulb section.
http://faq.auto.light.tripod.com has a great amount of info as well. I dont have the link to the Philips forum right now, but I can post it later if anyone is intrested.
Long winded., but with 3x more light output then a stock Contour, I can be.
EDIT: Oh, and polarizing the beam isnt the best idea. Good in theory, but not in performance. Light is exiting your housings at all different angles. If you only allow the light that is, say 30 degrees from the center axis to escape you will be putting on blinders. You would have no foreground (the light that uses the top of the reflector) and your long range and overhead (stupid DOT) will not exist.
