About four years ago, I added four LED flush-mount lights to my living room, tapping into the existing ceiling-fan feed. The existing wiring is 12/2, but I used 14/2 for the added lights after being told it would be easier to work with and fine for the small LED load.
I’ve since learned that 14-gauge branch-circuit wiring generally requires a 15-amp breaker, and I confirmed this circuit has a 20-amp breaker. Everything has worked without any noticeable issues, but I want to correct it.
I have attic access and am willing to replace the added runs with 12/2. Is that the best approach, or would changing the breaker to 15 amps be appropriate after verifying everything the circuit supplies?
Appreciate any guidance.
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Additionally
Here’s the schematic of my two rooms: https://imgur.com/a/FtERVWq
Living room: The fan and puck lights have separate switches. The 14/2 feeds only the puck lights and ends at the last one.
Garage: I tapped into the original center light and added the puck lights using 14/2.
Shared on Circuits:
Circuit 01: Garage lights, guest bathroom, hallway light
Circuit 02: Living room, hall closet light, living room outlets (TV)
From my understanding, because the LED puck light is the the last in line on that 14/2 wire, and nothing else is passing through it, the only thing providing any load to the 14/2 are those lights. So even if someone plugs in a hair dryer in the guest bathroom, that energy isn't passing through the 14/2. Am I understanding that correctly?