I recently wired a new light fixture with LED bulbs to a dimmer switch (dimmer is compatible with LEDs). This is on a dedicated lighting circuit with an Arc Fault breaker. I used brand new romex 14/2 from panel to switch to light.
On a separate circuit (old BX wiring, ground confirmed) is a receptacle that has a TV, receiver and DVD player plugged in. No Arc Fault breaker for this circuit.
When I turn on the TV, receiver and DVD player (they all turn on at the same time with the remote power button), the LED light flickers once for a small fraction of a second.
If it was on the same circuit, I would guess its the voltage drop affecting the transformers in the LEDs. But at this point, I am unsure because the loads are on separate circuits. Any ideas?