I am looking for suggestions on replacing my current pool lighting. At the moment, I have a non-functional SunLight 12v SPA light, with a Hydrel adapter ring. After laughing, Pentair informed me that the ring hasn't been produced for over 10 yrs. Not really sure of the niche i.d., but measuring what's left of the adapter looks like a slightly over 9" opening.
The guy resurfacing the pool says we can make up a bit of difference, but it ought be a fairly close fit.