As part of my quest for more visibility, I purchased and installed Electrical Connections' turn signal conversion kit. They sell it at this site for about $50.
THE VERDICT: NOT RECOMMENDED.
This kit adds a ring of red LEDS on the inside of your rear turn signal lenses. For running and brake lights the LEDS shine red through the amber lens. Your regular bulb does the turn signals. From the pix on their site, I expected a somewhat solid red light. Instead, you see a distinct, thin
red ring that's only 1.5 inches wide (half the diameter of the lens). There's no scattering to make the rest of the lens light up.
It did increase my visibility somewhat, since the rear turn signals are running lights now. However, they're NOT very bright
, and not very eye-catching when the brakes are applied. They were also a pain to install, so much so that I posted a how-to on this forum, to share some tricks to make it easier.
There are better, brighter ways to light up your ride that cost the same or a little more than this one. Easier installation most likely too.
I recommend instead: Hyperlite brake lights.
I was disappointed with the EC conversion kit, and very impressed with my wife's Hyperlites... so I just added a set to my Vulcan to get the job done right. Hyperlites are impossible to ignore, easy to install, and so tiny they hide beside the license plate. You have your choice of flash patterns or none. I use the 5-second flash going to steady. If I'm stopped and worried about someone approaching from behind, I can reapply the brake for some psychotic LOOK AT ME flashing, which then settles down to not annoy those behind me.
Installation? Thirty minutes. Tools needed? A wire stripper, or your knife if you're careful.
I shot some video showing these in action on my Vulcan. Youtube resized it and the titles are a bit fuzzy, but you get the idea. http://www.youtube.com/watch?v=IGWfVu4wWmQ
Your mileage may vary, but that's my story and I'm sticking to it. Good luck with your own lighting upgrades, and ride safe!