I'm not ignoring science.
Fluorescent components (cloth) will emit light while being exposed to ultraviolet light, and phosphorescent components (cloth, eyes, feathers, sinkers, tape) will emit light after being exposed to ultraviolet light.
If you're shining an ultraviolet light on a jig before casting it out the only thing you're going to do is activate the phosphorescent components.
You don't need an ultraviolet light to do this as fluorescents, incandescents and LEDs emit more than enough ultraviolet light to activate them.
As for ultraviolet reflective components, such as Shimano's Keimura cloth, that's self-explanatory.