I soldered 3 LEDs in series. With a 9-volt battery as the power source, no resistor is required for these LEDs.

I purchased a 9-volt battery holder and a small on/off switch for power.

And... it looks like I didn't take any further photos of the progress, but suffice it to say, it was a simple job, and I used a hot glue gun to affix the wired-up LEDs in the eye sockets.

The on/off switch resides inside the dome, which means I have to remove the dome to turn the lights on and off. I have an idea for doing so outside the dome that I will probably implement after WonderCon, and I will probably add some diffusion for the LEDs at some point soon as well.
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