Step 1: Yard Light
Step 2: Burnt-Out Bulb
I used the continuity setting on my multimeter while I was still planning to use the filament leads, this isn't really necessary.
Step 3: LED Board
I like to use this UTP CAT 5 cable because it's incredibly cheap. I have a big spool of it and it's great for low power electrical work. I use it a lot in breadboards and with my Arduino boards because it only has a single 24 gauge wire strand.
Once the 3 positive leads were soldered to the PC board, I cut some short wires and soldered each of the negative leads to the next one. I then soldered longer leads to the centers of the positive and negative leads.
The bulb is supposed to fit into the dome from the bottom, but my LED board won't fit so I had to solder the leads from the LED board to the light bulb base through the cone of the flashlight. Solder the negative lead to the side of the bulb and the positive lead to the tip of the bulb. The flashlight has a washer collar that fits over the bulb and makes contact with the switch. I had to make sure this would still make good contact with my modified bulb since the wires and the solder widened the base by a little.