I can't answer for Timbeau, but I can tell you a few things about dynamo lights. I have read that they were required on all bikes in Germany until 2013. The requirements were stringent and still are except about the source of power. The beam must be shaped like a car headlight's beam with a sharp cutoff at the top to prevent blinding people. The power is limited, and I think this is silly, but the engineers who design the lights have been extremely clever with the lenses and reflectors to get the most light out of a small output. People have told me that my headlight is bright, but it's because it's so well focused.

It really is great not to need to remove and install my lights at every ride. Bike thieves are weird and seem not to be very smart. They carry bolt cutters and other tools but they don't carry wrenches. I have no idea why that is. I once had a thief try to remove my headlight using brute force. He succeeded in bending the bracket but nothing else, and I was able to bend it back into shape. It's also great not to worry about the charge of my lights. I hadn't realized how helpful it is until I no longer had to do it. I've seen bikes locked up on NYC streets with bolted-on (dynamo) lights, and they don't get stolen, proving my theory about thieves not carrying wrenches.

I use a dynamo hub, not a bottle generator. Bottle generators used to add a lot of drag (and noise). The B&M unit claims to be much better, and it probably is, but I'm sure dynamo hubs still have less drag than the B&M bottle generators. They're also silent, though I can feel a vibration above about 15 or 20 mph.

Timbeau, your bike is beautiful in its practicality. I know it's a bit late to point it out, but Sturmey Archer makes a front hub with a drum brake and a dynamo.