I have two switches, (one inside the house, the other at the front of the garage). These control 2 lights in the ceiling of the garage. I would like to install 4 new LED lights, and change the existing 2 lights into junction boxes. 3 wire runs in both switches. On one light base, there is 2 black, and 2 white. On the other base, there is just a black and white. Can I add a new 2 wire into this base and run to the new LED light? Marette off the black and the white wires? I hope this makes sense.