Tosspot wrote:

It's coupled to a European dynamo light

What light is that?

http://radtouren-magazin.com/wp-content/uploads/2017/02/Herrmans_hblackpro_9323.jpg
from
http://radtouren-magazin.com/11530/e-bike/test-e-bike-scheinwerfer

(Compared to the DC version shown in the test, the dynamo H-Black-Pro is
somewhat dimmer.) It doesn't really matter because the Herrmans optic is
annoyingly unrefined in either version. And, needless to say, it's a low
beam with a symmetrical cutoff, so it is certainly not producing a DRL beam
shape.