Two window questions

Remove the old glazing compound and re-glaze it.

Glass does a good job of blocking UV but not 100%. I understand the newer multi pane windows with the heat film inside do a much better job.

What kind of photos do you have? There are very large differences in how resistant to fading. A good archival processed silver based and properly toned print will last a very long time. A typical inkjet print will have a very short life.

Even without UV the photos will fade, have copies made and store a set in dark.

another solution to the photo problem would be to leave the window glass alone and change out the glass in the photo frames with UV glass. I know that custom framing shops carry this, but I'm sure you could get it cheaper through an auto glass place.

my cousin owns a Glass Doctor franchise, which does auto glass and home windows etc. I'm sure you could go to a similar place and have some pieces cut for your photos.

m Ransley is right on. UV glass will do little if the photos are getting direct sunlight on them. Intense visible light will fade them quickly. John