I
finally have my bike back in riding condition, after about 2 years of illnesses (minor physical ailments of mine, major Bing problems, new tires, 10,000 mile service for the bike). In the process, I asked a reputable independent BMW repair guy for recommendations regarding visibility lighting and a modulating brake light system.
His preference for both is a local (Washington DC suburb) producer, Skene Design (www(dot)skenedesign(dot)com), for their P3 brake lighting system and Photon Blaster fork-mounted front lights. The P3 is a pair of adjustable modulating red LEDs mounted vertically, one on each side of the license plate. (There is an option to incorporate the rear turn signals into the P3 system, but I don't have it.) I already had an LED brake light display; I don't know whether or not it was replaced.
The Photon Blaster consists of two fork-mounted, high-intensity displays available in either yellow or white. I have yellow, and they are
bright! So bright, indeed, that they do not photograph properly.
A big advantage for our bikes—the lights don't pull much current, so I didn't have to upgrade my electrics. Also, installation apparently is quick enough that when he quoted me a price including installation, I just let George install them.

Easiest way to check out the lighting: just google/bing/(whatever) "photon blaster", and you can see photos and descriptions of both systems. (Note the Beemer-friendly photo(s)).
My satisfaction index is very high—now, if a 4-wheel driver claims not to have seen me, that person should be presumed blind, stupid, chemically impaired, or some combination thereof!