> > Even with a small secondary cell to cover brief interruptions from
> > the dynamo, I prefer to keep my cycling as effortless as possible.
> > So I recharge my lights from the mains supply at home (or from a
> > solar cell etc) intead of powering them as I ride.
> >
> > A good bicycle headlight is at least 10W (ignoring the little
> > candle-like ones!), that might be an extra 50-100W of dynamo
> > effort, which is quite a lot for me!

Have you considered a sealed lead battery and LEDs ? I use 6V
with a couple of 5mm whites in reflectors at the front and 1/2 dozen
flashable red at the back

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