Simple.... You had voltage to ground, your pool light was grounded. Glad I could help!
Not sure what you are saying here. From reading this chain, seems there is stray voltage in the ground or my nuetral is higher then ground. The light ties the water to nuetral threfore providing a current path from the deck to the water. I have not seen a solution posted yet to fix this. One thing that is confusing to me is that the ladder is a direct conenction from the ground/deck to the water. Why doesn't this bleed the stray voltage? If my nuetral is higher then the earth, should this also not cause a current flow down the ladder and to the light which in turn would trip the GFCI? Perhaps the current is not high enough?