Bob:
Right you are...a picture can clear up a lot of technical description.
When adding a piece about Euro Headlights to our Technical manual, I included two photos of a typical Euro headlight assembly annotated to show the position of each bulb and other components. I hope the photos will help the reader. I also hope others will add to (or correct) the article and add more articles.
If I can add to the Manual (I'm no techie) others can do it also.
Richard M