Interesting idea about using USB rechargeable lights. Hadn't thought of that one. Will be interested to hear how it works out for you.

With respect to the E-werk, I haven't gone with one of these, instead I went with the PedalPower+ Super-i-Cable. PedalPower+ do other models with more battery backup power as well. The PedalPower+ approach might be worth considering if you want extra charging capacity (you get the built in battery plus dynamo).



BTW I have a SON 28 as well. Nice dynamo for sure.

Andrew