I recently added this LED lighting kit, to my Givi V35 bags, and after a couple of weeks use I'm very pleased with it. It acts as additional signal lights and brake lights. I've had people nail the brakes when they're a little too close behind me, when I just tap the brakes to slow down. After dark it's like a slap in the face, when they come on.
The one weird thing is that there's about a one second delay, for the LED light to come back on, after the turn signals have stopped flashing. Some peculiarity in how they designed their controller, I guess.
This is how it looks with the brakes on. Sorry for the poor quality of the shot. It' s a screen cap from my Contour HD video camera.