I’ve just finished planning modifying this ceiling light that originally came with CCT capability including also a small remote control.
The Idea was to take some power from the existing power supply for the LED & ESP strips which wasn’t suitable because 180V Are way over specs.
I decided to use a secondary power supply.
I came up with this:
There’s a 12V transformer with an 8A output. It’s protected by a fuse and then connected to a DC/DC converter that changes 12V to 5V with 6A fuse on the output.
From there, it connects to the ESP8266
The ESP8266 controls the relays and also sends signals to the LEDs.
Everything else in the plan should be pretty self-explanatory.
You may want to include a level shifter to handle the various outputs.
Even the relays will be easier to source with a guaranteed 5V output driving them.
Make sure you don’t get an I2C type - too slow for the WS281x devices
Hopefully the 12V->5V converter you showed is just a stolen image and not what you actually purchased.
Those “Black w/red writing” models are well known to be the worst choice you can make. Pick something else…
Other than that it looks reasonable over all, should be fun