Where to put the Philips Vision Plus, or similar upgrade bulbs?
Surely, doesn't it just depend on whether you want brighter dipped beam or brighter full beam, or both? The bulbs are exactly the same (H7) in the upper reflector (dipped beam) and the lower reflector (full beam).
I've just put Vision Plus in the full beam, 'cos they weren't bright enough for me on the country lanes (it's made some difference, though not major). Dipped beam seems to be fine for "normal" driving.
The front fog lamp bulbs are also H7, I think, so you can also put them in there if you want. This seems a waste of money, though?