Wiring the pool lights

I had a leak in the light conduit to the cross box which had water in the cross box. They used a vacuum to suck out the water and resealed it somehow. Not an expert on pool lights but I think they seal the conduit at the conduit at where the pool light is under water. Not sure how that will go with water in the conduit. Maybe it is sufficient to just seal off the conduit at the cross box which is usually somewhere in your decking which is above the water line.
 
Yes, most pool lights can be wired with water in the pool. Almost all of the common pool lights are wet niche lights, so the fixture is completely surrounded by water and there is water in the conduit. These lights are normally wired before filling the pool on new construction, but installing them wet is how you handle things when the light fixtures need to be replaced. The conduit should be water tight and the other end should be well above water level, so there won't be a leak unless something breaks.
 
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