There are a lot of details here we don't know. Can you put in LED lights? Sure. How specifically to do that in your pool? Don't know. If it was me I would find out why the new lights keep dying in your setup. What is the voltage the PS is putting out? You might just need a new power supply. There are lots of LED lights on EBay. I would look there and see what you can get.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra