LEDs, CRI, fading
Marla, you're welcome. Most consumer LEDs emit very little UV light, so they're less likely to cause fading than (say) sunlight at the same levels. High CRI LEDs, because they're more accurate, tend to let people see well at slightly lower levels, also good. And the use of dimmers makes it easy to minimize light. I believe museums now often use LEDs as conservation-conscious display lighting.
FWIW, I've believed that indigo has outstanding light fastness (the "fading" in jeans is abrasion), and madder is also excellent (if mordented). Pieces with lots of dark blue and dark red might be a bit safer under lights, and they're the ones that that tend to need light to "pop" in any case.
-- Steve Pendleton
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