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Dealing with underground work for commercial wiring projects (Lowes, Home Depot, Walmart, Bed and Bath, Best Buy, etc...- electrical contractor working on the store shells) there are many options avaiable so that you could run schedule 40 pvc to junction boxes and install the lights into them. This give you the option and flexibility of pulling new wire in should you have a section that goes bad, the ability to swtich out fixtures when they go bad (nothing lasts forever) and room for upgrades should you look to build a pool house or add a hot tub at a later date. It's easy to change out the light, and if you pulled in a separate circuit, add an outlet or junction box to tie in the new structure. The only trick is when it comes to sealing the boxes- they come with neoprene gaskets, but honestly they tear easy and are not waterproof. Use gel filled wire nuts to keep moisture out, and seal the lights where they attach to the box with clear 50 year silicone. This will in effect glue the light right to the box and seal out any water from getting directly in, and when you do get a leak after a few years, the gel filled wire nuts will keep yout conections from corroding and falling apart. I have seen this done many times for in floor outlets and juntion boxes where they are exposed and get a floor washer run over them every day. I would also recomend spending the money for the heavier cast brass fixtures as they will hold up the longest to any chemicals in the pool water as well as the rain, sun, etc... Make sure you use stainless steel screws to prevent any oxidation from forming between two dissimilar metals- the most common problem seen on call backs or maintenance work I have done as an electrician.
Hope this helps!!
Bill
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