For me personlly,the little room where i keep everything i keep the curtains closed. The windows are left open for air circulation but,because the room is smallish i find it easier to just keep the curtains closed. I also have a 71 inch tv oposite the main window so the curtains are better closed anyway for better viewing pleasure
If,i was doing up a specific larger area for collections i would look at alternatives like UV film on glass,or something similar. Nothing worse than fading,blemishes or discoloration.