Yes thats right Robin.
IMO after connecting the inners up to perform fog functions I would stick with the normal fog light, albeit a red bulb behind a clear lense.
The trouble is where the inners were not designed to have LEDs in them there is no extra reflectors like in the outers which makes them quite hard to see in daylight.
During the day you can only see a ring of red dots not a full circle like the outers. The extra reflectors in the outers give out more light as they bounce it around.
I have tried increasing the intensity with VCDS but its not that thats the problem its just the lack of reflection.
At night its a different story as the back of the car looks like christmas tree