Thank you for your advice guys. The lights are now fitted and working. I ended up stealing the 12V from the generator, by herr_tichys advice. Earth was connected to the earth point behind the left headlamp.
Disabling them is a matter of disconnecting the fuse near the generator. The cables can be disconnected from the hood aswell, required for removing the bonnet. It's a bit of a hassle right now, I will be looking for a better plug.
The LED bar is rated 120W and the small ones are rated 36W. I can say that the rating is probably wrong. I fitted a 10A fuse and it didn't blow. If the rating was correct, I would need a fuse with at least 13A. But hey, that's what you get for buying cheap stuff from China.
Dipped beams:
Main beams with spotlights:
I'll take some pictures in daylight aswell to show what it really looks like.