Two options for finalizing the project.

There are basically two ways to finalize this project. The first way is for someone to purchase a UVC LED bulb that will operate on 5 volts and send it to me. The second way is for someone with electrical knowledge to let me know exactly how to transform my 5 volts (or ~10 volts from two XO's) so that we get up to 110/220 volts to power the aquarium uvc bulb.

I contacted the company that sold me the uvc bulb, and they informed me that the bulb was simply mislabeled as 12 watts, and is in fact a 5 watt bulb.