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I don't think the wires and screws are going to effect a mature tree. If you don't believe me, I'll start sending you pictures of tree houses that have been installed since I can remember on trees that look pretty healthy.
The key is to be upfront and explain that over time, the light may need to be adjusted or wires we ran if they get pulled.
If they want the lights in the tree, then most people are willing to take the small chance that it would cause damage.
On another note. If you were to say you wanted to wrap christmas lights around 2" cal trees, then that may be a problem.
As long as you are running the wires so they don't wrap around the tree in a circle and girdle it, I don't see any real problem.
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