Is that an Axa-Basta headlight? Do you run it off batteries (cannot see dynohub or bottle dynamo in pics)?
It runs of a dyno. Take a relook at the rear tyre where the mudguard is by the pedals. That is where the dyno is based. It is actually quite an impressive bike. It goes very fast with two men. With my partner, well she needs some more training and hates speeds. So I often have to be on the coasting brakes for her.