Protection question for sun/fading for PSA vintage and auto cards

[paul]

In my earlier days of collecting, I lost quite a few cards to sun damage. For what it's worth, red faded the most. The only solution I found that still allows me to display my cards is to completely black out all windows with dark curtains or shutters. This has worked well. The small doses of artificial light that they receive when I turn on the lights and look at them hasn't seemed to do any harm.

I'm not much of a graded card collector, but I doubt the cases provide any protection.