[MarinerZ4C]

Regarding PPF on your lenses and how it worked out: Your experience is the majority, and most people with PPF on their headlights will love it.

But sometimes when a PPF is added to a lens, the new optical stack can produce an iridescent Moire effect. Most owners would not have noticed the effect on my E46 lenses with PPF - but I used to measure optical films as part of my career, and in bright sunlight I could notice the slight iridescence. This was only reflected light from the outside - it didn't affect the headlight color or the beam pattern.