I've been to Germany quite a few times. I've seen plod on bikes around the Eiffel area a few times but they were just their for a presence and didn't seem to be stopping enyone.
The only time I was stopped was when filtering past a queue of traffic over a hatched area with solid lines. The non English speaking jolly looking rotund red faced policeman wagged a finger and appearently that area is called 'das hinterland' and it is 'verboten'.
I doubt they would worry about Hid bulbs unless they were blinding other motorists.
