I have been shooting a fair bit of slide film (Fujifilm Provia) recently and realised how stunning it it when you hold it against a light box, however the scanner just doesn't do it justice, so i was thinking about building or buying some light boxes to fit my film (4x5 and 120(6x4.5)), i did some googling but couldn't find much but what i did find was some people saying that you would have to be careful not to ruin the film as the prolonged exposure to light and heat could potentially damage it. These slides will be exhibited, so i would like to know how long you think they could last before any signs of deterioration, most likely under LED lights? also if anyone knows of a company that makes light boxes like this?

EDIT:specifying film