I used a bulb, carefully broke the glass from it and removed the filament. I then checked with an ohmmeter which post was the neutral and which was the hot so the polarity to the LED controller was correct. I then used butt sleeves to connect the wires to the bulb base. I drilled a small hole into the top of the light housing, just large enough for the wire to fit and then notched it to the edge of the housing. I did remove the housing to make this easier, and when done, I sealed it with a bit of silicone caulk.