why does wind trigger my motion light at night, the light is not triggered on unwindy nights.

Because, stuff is only then blowing around or the wind is blowing the light fixture around. Most people aren't aware how far and wide motion is detected, so trees, bushes, long grasses, swing sets, etc. will trigger the light. If possible, adjust the sensor eye more sharply down to the ground to cut-out landscaping that's disturbed by wind.
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