The LED strobes that I bought come with the controller that flashes the units. I bought 2 pair so I could put them on the front and back. They're super cheap--under $7.00 US with free shipping. http://www.suntekstore.com/us-44-led...hts-amber.html
This was the first time that I ordered from this Hong Kong-based merchant and was pleased with their service. Everything arrived in good shape and incredibly quick (for free shipping); I got my order within about 2 weeks. I need to order another set of strobes to add signals to my trailer.

Since a controller operates a pair of strobes, I've got the pairs split left and right. You can see the front controller, which controls the front and rear left signal lights, in this photo (it's the small black box zip tied to the center of bracket holding the front signals). All 4 of the LED strobes operate off 1 9V battery that I've got stuffed in that Bell bag. I'm happy with this set up, but it does require running several wires from front to back. Since I did this shortly after adding an electric power assist kit to my bike, I wasn't too bothered by running more wires.



I'm planning on buying a folder soon to take with me on some travel by train. I'm considering adding turn signals to the ends of the handlebars so I don't have to deal with wear and tear on wiring due to folding and can get adequate front/rear visibility with one set of signal lights. I'm contemplating a simple set up that will house all required components for each signal in an autonomous unit. I'm thinking of putting a bright LED strip, powered by a couple of AA batteries and a simple switch in a plastic tube that I can insert into the end of the handlebars. I got to thinking about this type of set up because I'm too cheap to buy a set of Winkkus. http://www.winkku.com/




P.S. Here's a short video giving you an idea of the brightness of the strobes.