Recessed lights, wiring, breaker buzzing, etc
I'd like to get some feedback on my lighting and wiring. I am finishing my basement and installed 14 recessed lights all with 60W bulbs. I have 8 lights on one dimmer switch, with one side of heat sinks removed (480W), and then the other 6 lights on a second dimmer with both heat sinks removed (360W). The switches can handle 600W with no heat sinks removed, 500W with one side removed, and 400W with both sides removed. All of these lights are from a single feed from the breaker panel. The line is 12 gauge wire and using a 20A breaker. The lights are the only thing on the circuit, but I noticed a faint humming/buzzing noise coming from the breaker when all of the lights are on and turned up all the way.
I believe I am well under the limit for the 20A breaker (840W total). I am using a brand new breaker (Square D QO).
Should I be worried about the noise?