Swimming pool light - electricians?

I have two lights about 3 feet below the water surface. One of them turn on and one of them went off recently.
I had the electrician who was working on my remodeling take a look, and he opened a junction box near the pool, and there is power at the junction box, so it is either the bulb or the light fixture is bad.
He told me normally swimming pool lights are low voltage, but in my case, the wire going to the light is not low voltage but 110v. He said either the light fixture has a built in low-voltage transformer, or when they put the light fixture in back in the 70s, they used a 110v light fixture, and I need a specialist that deals with pool lights to examine it.
Do I need to hire an electrician that is specialized in pool light fixtures? or do I need to drain the pool down below the fixture level to take a look myself?
My water table is very high being in Miami, I was told I cannot drain it or it will crack, what if I drain my pool to half full (25000 gallon pool) it will not crack right?
Thanks,
MC
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Line voltage pool light fixtures are very standard. Typically, one screw holds the totally enclosed fixture into a niche in the wall of the pool. If you remove the screw, there should be enough cord inside the niche, for the fixture to be lifted out and placed on the pool deck for repair. If the fixture is in good shape you may be able to replace the lamp and reseal the fixture without water getting in, but if not , just replace the entire fixture. These things come with cords attached, which you can buy at whatever length you need to reach the deck box.

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You can tell that some people are a lot smarter than I am. I would have just used regular fixtures and expected the repairmen to use scuba equipment.

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That is why they recommend replacing the gasket
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I've never watched what they do. I suppose they are trying to use the old gasket. All I can say for sure, is that they never get them sealed

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sticking up on my pool deck. The line runs under my deck and I would have to tearit up to replace it. Do they make a low voltage light or something I could use to avoid digging up through my deck? I hate to give up my pool light.

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