Decreasing exposure to all light, especially ultraviolet (UV) should be a significant concern when protecting items such as cards, paper, art work, etc. UV is the highest energy and most damaging light. As an example, most museums filter UV from light sources and reduce light exposure by limiting the number of hours art is illuminated. There are also guidelines for museums intended to minimize damage from light. For example, works of art on paper are generally stored in darkness with exhibition not to exceed six weeks every two years.
Reducing UV is manageable of course but do not believe that just because you are using 100% UV glass in a display case, that damage is not being done to whatever it is you're displaying. Even non UV portions of the light spectrum can in time degrade and damage your cards.
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