In article ,
Dave Plowman (News) wrote:

Putting the bulbs in upside down will alter the beam setting.

Which type of bulb can be fitted upside down if it matters? None I've seen.

Wifes Pug 206 had odd lights when we got it (year old, from a main dealer).

H7 headlamp bulb was upside down. It didn't "fit", but was easy enough to
get the spring clip in place. When I used to work at a garage it wasn't
that uncommon to see cars with them fitted upside down.

Likewise the dual filament stop/side lamps - "I fitted a bulb and now my
side light is too bright" being the normal complaint (assuming they even
noticed). It was a bayonet cap with offset pins IIRC, but easy enough to
force in if being ham fisted... Saying that, I've not had a car for years
that used those, so maybe they've died out :-)

Darren