Used #12. run about 25 feet at most from breaker.
Yes, it takes a while to power up and when off, it has to read itself and then realize its dark then power up. It goes off about three times per hour.
Have the sensor pointed to a dark area and picking up foreign light is out because it does its cycling when no cars are around.
Did the tape test, and it reads dark fine, it will come on fine, but after awhile it cycles.
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