Umm i honestly dont know. Google says you can use linen drapes. Apparently linen can filter out UV rays, but still let light in.

Hope that helped!

Of course! Im looking to do this with my bookshelf once i get myone custom built. ❤️❤️ always gotta enjoy the pretty spines/book faces.

You could look into adding door/s to the bookcase. And they make "UV protection plexiglass"(the same things they use in jersey shadow boxes) and you could add that as the glass. It will be light weight, and protect the books at the same time❤️