The good things abozt bulbs taht they are easy to mail in an envelope.
I just remembered an other possibility to mount a light on the fork:http://www.klickfix.com/minimounte.htm
The Minimount should be easier to get here than the overseas solution.
I've changed all my bikes to double wires in the seventies. German bicycle light enthusiasts checked the resistance with real current (don't trust your DMM in this case!) and got horrible numbers.
When you have a dynamo on your rear wheel and feed the main current through it, the loss might be significant.
As almost all dynamos are constant current sources, the front light may not be dimmer in such a case (sufficient speed assumed), but it will kill the backlight.
Also some mudguars with built in wires should be avoided (as wires not as mudguards). They are very unrelyable.