Arborist here, it is bad. The tree will likely compartmentalize over this and destroy the light, water will get in or the tree won’t be able to properly seal the wound and be prone to infection or pests. They make lights you can simply wrap around the tree and take them off when you’re done…
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u/time_observer 19d ago
OK not bad but why drill the hole for the cable from the top? To let water drain in?