UV Light help???

I’m looking for a good UV light to shoot a video, similar in effect to these:

Something not too expensive, but would make the string glow bright in a pitch black room.

Anybody know of a good one?

just buy a UV bulb some stores just sell them individually

I have absolutely 0 experience with UV light, let alone lightbulbs. What’s a good one I can just plug into an AC outlet that’s small and bright enough for a yoyo video?