> Well I am going to replace bulbs with LED that's already decided

That's good. Now, if you want to use the dynamo as the charger
(although honestly I think you'd be better off going to battery power
with a separate charger. After all, you won't be needing all those
amps anymore) then you'll have to do some measurements on it.
I expect it will be AC, so some circuit like that I posted the other
day will do you for rectifying the AC to DC for charging the battery.
The diodes can be 1N4001's or a pre-packaged bridge, the
smallest one on the shelf will suffice. Once you have a DC voltage
to measure, then you can think about what needs to be done with
it to charge the battery properly. If it's a supercap, then you'll need
to limit the voltage, probably with a low dropout 5V regulator.

> I also read the pulsing the light would be more efficient, in that
> case just a resistor isn't going to do it

What I think you mean is that you could pulse the LED with more
energy to make it brighter, but still keep the average power at a
safe level, the same way that IR LEDs are pulsed with high current
to get extra range. However, an IR receiver is not the same as a
human eye, and I couldn't say for sure whether high current pulsing
would necessarily mean a greater perceived brightness. Perhaps
it would be better to start off simply with a dropping resistor and
DC. You may find that's perfectly acceptable. I know I'm OK with
my LEDs

> About the dynamo, not sure really, it's one of those that "leans"
> on the tire for rotation.

Yuck. Haven't used one of those for a long long time. Complete
PITA as I remember. I spend enough time in 1st already on
Auckland's damn hills (for those who don't know, Auckland is
built on around 20 volcanic cones, errr, extinct ones hopefully,
up and down, up and down,........)

> I'm guessing that is friction, this hub thing, what is that?

It's built into the rear axle. If you plan to stick with a dynamo as the
primary supply and you no longer want the extra effort of the tyre
dynamo, maybe you could look for a back wheel with a hub one

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