Hi-

Probably not much response due to the holiday. Sorry, I don't have any real input. I might suggest that you try the Garden Web forum under landscape design, but you already did that! Houzz bought up a bunch of stuff, and the organization is not optimized well, probably due to history. Hope they do something to combine the forums, and also to make it so one can easily access and peruse the forums from a mobile device (it's like they are trying to hide the forums, in order to drive traffic directly to paid content and shopping).

My only real help is anecdotal. There was a 12-volt lighting system in the 1969 home we bought in 2016. It was pretty old. We don't use part of it because it has failed. We hired a landscaper to transform other parts of the yard into a less water-dependent design. He looked at the old 12-V lighting system in those areas, and recommended that we just tear it out, as replacements aren't easily available, and an LED system would be much more efficient.

Low voltage is still useful, but mother nature will always win in the end. Be aware of expenses to replace or repair older components, as at some point it may be more cost effective to put in a new system. i.e., many more of your components may fail in the near future due to seals, age, etc. Sorry, that's all I've got.

So, from what you know - 12V transformer/set up cannot be combined with LED light fixtures?? I was kind of afraid I was going to hear that... The set up itself is fine, and the 14 gauge cable is in great condition; so, I was so hoping NOT to have to tear it all out and redo.

No....I have no idea if LED will work with existing supply and connections. It might.

What I meant was that the wire runs and connections on my old setup were the weak links, and it was easier to just remove and consider setting up again sometime in the future. 12 V runs are usually much shallower than line AC voltage, and it was easier for us to tear it out considering some of the other work we were doing (i.e., the 12 V runs were in the way anyhow and were compromised)

If the wire runs are OK and not damaged, then I'm sure you can re-use them. You may need a different supply, and you just have to make sure all new connections are sealed correctly.