This is a little ball to house an Adafruit NeoPixel mini LED. It has a hole in the top for the light to shine and a hole in the bottom for the wires to come out. The idea is to mount it in a ball socket so you can adjust its angle. Here's the LED we're talking about : http://www.adafruit.com/product/1612 Printed 20% infill each side equator up no raft or support. 1) Solder wires onto the the LED. Data in, Data out, power & ground. Make sure the wires are as close as possible to the center of the disk. 2) Slip the bottom hemisphere up the wire and glue the PCB into the recess of the hemisphere. 3) Glue the top hemisphere onto the bottom hemisphere. 4) Mount in a socket. See the picture for an example.