In other threads though I see that some new owners are less impressed with the performance of the unique headlights, so I'm writing tell you I have what I think is the best solution. My wonderful college age boys went together and got Dear Old Dad an HID kit for his 48th birthday. (All that means is they will be hitting up DOD for more cash more often for quite a while - but hey, it's the thought that counts.) They actually got a great deal from a friend that I'm assuming must be in the Chinese mafia, but I'm not asking questions. $210 for estimated retail value of about $350.
The thing is darn impressive. I only installed the low beam 6000k Blue-White 35watt portion of the double beam system. I'm not sure if a single light system is available. It is brilliant white, almost too glaring on direct view, but probably the best possible effect for those would be left turning blue haired mamas. It's like Mercedes HIDs, as apposed to the softer BMW automobiles and the very blue Audi HIDs. It casts a very bright, clean and broad beam that would probably consume whatever was thrown by any traditional driving lights. Visibility is now excellent by anyone's standards.
The best part is that it was very easy to install. Thank you, thank you BMW getting the battery out from under the tank. All the plastic parts come off very easily with the same star wrench and all you have to do is dremel the appropriate size hole in the back of the plastic dome over the back of the light housing to fit the rubber grommet that comes with the harness, seal with a little epoxy, zip tie the ballast on the inside of the head frame, then plug and play. I took my time and it took a little over an hour, but like everything else, it could be done in half the time once you've done it.
Anyhow, it is certainly worth considering if you are at all dissatisfied with the stock light and you want to kill the two lighting birds with one stone. I can now see and be seen. -- I knew I went through all that hassle raising those two guys for a good reason.
