Their solution was to fill in/pack the area around the light with hydraulic cement. Hopefully that's an adequate solution, but I'm more concerned with the root of the issue which is the ground water being that high around the pool. Makes me nervous thinking about the pool just sitting their empty for the next 3-4 months.Don't like the idea of just "plugging the leak" with plaster (although hydrostatic pressure should be pretty low at that depth). Call the pool builder and ask him to come out and look at it. Looks like they did a great job on the rest of the pool so hopefully, he'll have a workable solution.