5V power supply for multiple Lightify Gardenspots in parallel

I would say your probably stuck hard wiring these to your power supply. You can Google waterproof led power supplies. I looked into this a while ago and found several for sale online through Google and Amazon.

https://www.amazon.com/gp/aw/d/B00NALRA72/ref=mp_s_a_1_2?ie=UTF8&qid=1483195343&sr=8-2&pi=AC_SX236_SY340_QL65&keywords=waterproof+5+volt+led+power+supply&dpPl=1&dpID=41h4w1wCiaL&ref=plSrch

I ended up not needing the bigger power supply for my project (stringing 3 sets together in series), I went a different route.

I’m not sure you would need a 50 watt power supply to do what you want. If I remember correctly each set at 100% draws around 6 watts.
We discussed this in some detail in this thread around post #111 to say 130ish.

Hope that helps.