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Ever hear of "spiking" trees?
If the hardware gets in the tree, and the lights are removed, there's a potential for saw damage or injury.
The mounting system may need to be tweaked occasionally, as mentioned earlier, or fastened in such a way that the swelling trunk pushes it outward with each year's worth of growth.
If it's not low voltage, there may be a code to follow - a local code.
If its low voltage, the consequences to people from damage to the wiring, conduit or fixtures are much different.
So there may be a lot that matters depending on the voltage.
My preference, would be something like a galvanized nail that's long enough to stay fastened, but short enough that the tree's growth can nudge it outward each year.
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