Old Pool New Lights?

[cypressgrove12]

I purchased a new house early fall of last year. This year will be the first time opening it. The pool does not currently have any underwater lighting. I have to replace the liner since the pool sat relatively empty for an undetermined amount of time. Is there a way I can install lighting while i do this? If so how would i go about it in the most cost effective way?

[Teapot]

What is the structure of the pool, concrete, steel panel etc?

[cypressgrove12]

I'm almost certain it's steel panel.

[Teapot]

Ok then provided you can disturb the terrace to run power to the light you should be able to drill a hole through the steel and fit a standard return fitting into which a modern LED light will screw in.

If you cannot disturb the terrace, I have the details of a company that makes LED pool lights powered by the water passing through the return fitting you have already, clever huh!
Not personally used this item but saw it at a trade show, sadly the stand wasn't manned at the time but I grabbed a leaflet.