I don't recall ever reading anything that equated the light of the Trees with the Secret Fire.
I view the Trees as being a creation of the Valar, which they were able to hallow and fill with light by their own power.
I believe the Secret Fire belonged to Eru and Eru alone.
Quote:
Perhaps the danger with the Palantiri is the same as with the Ring
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But I don't think this was always the case. I don't think the palantiri were
always dangerous.
At least, we don't have a story about some vision-hooked royal functionary being dragged away from the palantir screaming, "Just one more peep show, that's all I ask!!"