You ll need two wires one white and one black for one circuit or more if you intend to wire a three way switch from the house or add more than one circuit.
Running wires without attic.
Watch the entire process step by step.
Totally hidden existing knob and tube wiring meets code and we have left it in place inside some interior walls.
The actual install of recessed lights here https youtu be 5yc8aqnvqqg the long bit is actually used.
Use thwn 2 14 gauge stranded wire if you get power from a 15 amp circuit or thwn 2 12 gauge stranded wire for a 20 amp circuit.
Run the wire or cable to its destination.
On a single story home or the the upper floor of a multiple story home this means accessing your attic to run wire.
But if you have knob and tube running in an attic or exterior wall the space can not be insulated until the wiring is replaced.
If you re working from the attic you can drop a weighted string down wall cavity then attach the wire to the string and pull it through.