Code Question on running new light fixtures with new wiring

Greetings,

I will be running new Romex wire to a new dimmer switch and the dimmer switch will control two overhead light fixtures simultaneously (not independently) over a kitchen bar area. New Romex 12 gauge wire (yellow) everywhere (circuit is 20 amp). The Romex for the lights and the switch will be contained in a junction box in the basement joists, with power coming from the circuit breaker. The junction box and the ceiling/switch boxes are all new blue plastic.

Here is my code...

Code Question on running new light fixtures with new wiring