Steve
Thanks for sharing your experience. I still wonder if the WS overpriced 24V power supply actually would have solved your problem. I wouldn't think 20v vs. 24v should make a difference. What is the current rating on your power supply? Even a 400ma supply should be enough for the 4 circuits in the building.
Also, I'm curious: Does the problematic ceiling LED lack the Rectifier circuit board that is wired in the other 3 circuits?
I just unboxed my Smith Bros TV and I have powered it up yet. I am considering Bob's approach of using an old laptop power supply, or even converting an old ATX power supply.
Speaking of overpriced power supplies, my Menards York Hotel requires a $20 4.5V, 5Amp power supply. That's why I'm thinking of using an old ATX for my several city blocks of buildings.
Bob