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E, DanielFading is definitely a huge concern, and I think you weigh that up when you decide that seeing the cards out is a higher priority than keeping the color as deep and true as possible.
That being said, I've tried my best to minimize damage in the short term by using a room that has less direct sun entering it, I keep the blinds closed alot, and I've also chosen to hang the cases on the same wall as the windows, so that all light is indirect - no beams ever hit the glass/acrylic.
You do your best, and then live with it if you want to live with cards around you.
The company (various ebay sellers market the product) also makes mention of adding a uv protector layer to the acrylic for extra charge if you mention it to them.
Overall, I think its a great way to have your hobby on display!
daniel