Degradation to the light output, not the lense. Whenever you put something on a light you change the optics. This is why my design was static-cling, I took them off when I needed the excellent optics that I bought the lights for.
Worse still are the covers that go in front of the lights, first-surface reflection, dirt between them, poor light transmission, ... this is the reason I invented the static-cling light covers long before anyone else thought of the adheasive versions.
Still however, they do change the optics because they change the thickness of the lense (which is carefully designed at the current thickness) and they have a different refractive index as well.
I'm picky about light output and control, it's part of what I do.
Quote:
Originally Posted by lowriderdog37
babymog: I just need enough to cover my euro lights. Rough measurements look like about 15" X 8" for each light. You have me a little worried with the degradation of the lens, over how much time does that happen? How does it affect the lens?
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