Ah, the good old:
Straßenverkehrszulassungsordnungen
I remembered when I lived under them ... quite a nice time ... now back in the Anglo-Saxon world of lawlessness.
For those so inclined:
Rules here
That's a very nice light and I love the idea of a very focused beam, much better than the Magic**** 1500 lumens (hate that term) that people often post about here.