Grin (Home page) have a very open policy. They don't do full ebikes, though, only conversion kits. But if you're open to starting from a normal bike and add a motor yourself, you should definitely check them out.
On this page: Kits Vs Turnkey - Getting Started they discuss how conversion kit...
Just had an email conversation with Brose about that... their answers:
- Front light is 12V@2A
- Rear light is [email protected]
I know the question is already a bit old, so maybe the answer won't help you... but it still might help someone landing here from a search engine looking for this information...