I commute year-round on my RT through downtown Seattle. To increase my visibility, I decided to add some additional lights to the bike. In Seattle it is grey and raining most of the time during winter months and since we are at 47 north latitude, daylight hours are short in winter
Last summer at the national rally, I saw the P3 (blinking brake light) and Photon Blaster (yellow running lights) LEDs in the vendor area. A few weeks ago I purchased both for front and rear on my R1150RT. The lights were purchased from http://www.skenedesign.com
These lights are really bright! They also flicker imperceptibly. I recently saw some Seattle Police motor officers with similar LED lights on their bikes, riding on a very grey winter day through downtown Seattle. The improvement to their visibility from these lights was dramatic. That's when I decided to get some for my bike.
I already had a flashing brake light (Brake! brand) and PIAAs installed on the front as well as some reflective tape on the rear of my system cases.
My current visibility efforts consist of:
Main headlight, PIAA hi-intensity hi-beam lamp, fog lamps (regular bulbs - I used to have PIAA hi-intensity bulbs in the fog lamps, but they were too bright for everyday use), PIAA 1100x hi-intensity lights under the oil radiator, yellow Photon Blaster led running lights.
Here is what they look like all lit up.
Brake! led flashing brake light, P3 flashing brake lights on either side of the license plate, 3M SOLAS reflective tape on rear of system cases.
Nothing yet other than hi-viz clothing. I have some additional SOLAS reflective tape that I plan to put on the system cases and center stand legs.
My brother gave me this jacket (Thanks Mark!). I also have reflective stripes on boots and my Aerostich suit. I'm planning to buy a white Arai helmet.