A lot of good suggestions, others have suggested a large wall or two large poles with a reflective device, I say instead of trying to be loud with something obtrusive, maybe you could obtain some kind of symbol or flag that blocks the light while your tree is growing to later on block the light. Or if desperate for a quick result, some kind of pole with an object to block the light from flooding your property. You might keep your receipts because once your neighbor realizes your effort for a solution, they may reconsider. Good luck.
kind people rock
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