Home Improvement Questions? Ask a Handyman for Answers
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If the clematis foliage is above the sensor then try re-positioning the sensor so it points away from the foliage. It's also possible that small animals could be triggering the sensor.
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I don't see any clematis in front of the motion sensor. Based on your pictures I doubt the clematis is the cause of the unexplained triggering. I'd be more inclined to think it is animals that are triggering the sensor. The sensor is infra red so it detects body heat. The clematis is essentially the same temp as the surrounding air so I doubt even wind moving it would trigger the light.
Just because you don't have pets doesn't mean stray animals can't wander through your yard and trigger the light. There's no way you can prevent this sort of trigger unless you want to trap these animals.