The spider (piranha) LEDs from Quickar arrived today - 120 of them in a little bag. They are for the turn signals and they're fairly bright. I took the photo with room lighting and a desk lamp. The 5 LEDs are in series drawing 70 ma. and the total Vf of the string is almost exactly 10V, so I can use 5 LEDs instead of 4 in each turn signal unit. The Li Ion battery will put out about 16.4V fully charged and there will be a 12V cutoff, so I'll have to use a regulator. Something like a 7812 in a TO220 package should work and they are cheap.

Still thinking about the handlebar switch. I bought a cheap turn signal called a Eurolight to get the switch. It has a master on-off switch with a power LED, a turn signal switch with green signal LEDs and a beeper. If I don't use the switch unit the wire will come in handy.