Very good topic as I think about this issue every now and then.
My mother is a huge metal head and has a collection of very rare autographed records framed on her wall (Pantera, Metallica, Slayer, etc.) with her windows always open. Those records are now sadly, completely faded.
I've learned from this lesson and currently have specially designed shutters that angles light to the ceiling. I wish I knew about this UV protective film you're mentioning as those shutters I mentioned cost me thousands...
