Well, there was the light of the Two Trees, whose last fruits were recreated as the sun and the moon, but I'm not sure how far they cast their light. Or how a tree would/could cast light, unless we are talking about a very special, powerful form of luminescence.
I've seen a white garden glow in evening and twilight, but that is a reflected light.
Maybe the elves had a kind of infrared vision that could distinguish heat, especially the kind of heat generated by creative energy?
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I’ll sing his roots off. I’ll sing a wind up and blow leaf and branch away.
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