Problem=

to make my bicycle saver (it's a low rider recumbent)I want to add LED light strips.

My bike has a hub dynamo producing 6V and 3 W out put. The strips need 12V.

Doable without adding too much balast?

You'll need a boost converter to power your LEDs from 6V.

Are you handy with a soldering iron? I have several suitable circuits

You MAY be able to use a Greinacher diode-capacitor voltage doubler circuit as most bike dynamos are actually alternators and produce low frequency AC http://en.wikipedia.org/wiki/File:Greinacher_circuit.svg

Or you could re-wire the strip for 6V

This Application Note has some ideas, mostly buck (step down) converters but a couple of boosters too AV02_0532EN.pdf

have you tryed it on 6v just to see if it works?

Pedal faster

have you tryed it on 6v just to see if it works?

yeah should work, just be dimmer..

I had my Chaly converted from 6v to 12v (needed it for the engine swap) It's not hard as much as it is annoying. I mean it's like wrestling an octopus.

<----- My purple Chaly