Choose the fixture first. Rewire the 3 way the same.
How To Add A Light
Add another light to existing switch. How to wire an additional light to an existing light switch adding a light to a circuit. So in the right hand box you could replace the 3 way switch with a duplex switch that has a 3 way and a single pole switch. This is about a 15 min project plus the time it takes to chase the wire took me about 30 minutes to chase the wire. Examples include adding lighting underneath kitchen wall cabinets where the existing switch will be at the exact height of the new lighting or installing an outside light by routing the cable directly through the back of an existing switch box to the outside. Or you can run som new cable from the light or the right hand box. Wiring the new light.
Then use the extra single pole switch for the new light with power and neutral from the other cable. Then pick a rectangular or round remodeling box that is small enough to be covered by the light fixture canopy. Unscrew the wire nut holding the two black wires together on your existing light. Check that there is no. After youve determined that the existing switch box will work to power the new light its time to shop for the sconce and pick up the remodeling box cable and electrical connectors youll need. Yet here i am adding a switch to an existing light.
Turn off all power supply to the room in which you will be working. If i can do it so can you. You can usually install a light fixture between an existing one and the switch by cutting the cable to the existing fixture at the location of the new one inserting the ends of the cable into the electrical box for the new fixture and pigtailing the new fixture onto these wires.