I am not a fan of yellow film on lights either. I can say though, I love my newly acquired Nokya yellow bulbs in my fog lights! The yellow light is not at all distracting like I thought it would be and it does shine nicely on the sides of the road at night. I think the yellow bulbs look good, but I definitely wouldn't want yellow film on my fog lights. It would be way too noticeable for my liking. Heck, I'm not a huge fan of the reflection of the yellow bulbs in the fog lights, but it's not nearly as noticeable as yellow film would be.
And for anyone that's not aware, yellow light is supposed to be best for seeing in bad weather conditions i.e. rain, fog, snow, sleet, etc. I haven't been able to test this out yet as the weather hasn't cooperated, but this is the reason I decided to give the Nokya yellow bulbs a chance in the fog lights. We'll see how they do in crappy weather one of these days.