Allan,
Thanks, That's kinda what I was fishing for- fishing identical patterns side-by-side except for flourescent materials. UN-scientific, but revealing.

Also, since most tiers have access to a UV light for curing UV goo, have you ever shined your flyboxes to see what flies glow, or portions there-of.
I did, and i was pretty amazed at what I saw. If fish see fluorescent, I'm tying under a fluorescent light from now on when using those materials.
I also spent a few hours and went through my materials and selected out everything that was fluorescent and collected them into a box.
For two reasons:
One- to select from a great array of Fl materials, and
two, so I don't mix them unintentionally anymore. A blend of dubbing with non-UN mixed with a 'hot' UV looks sick.
A third reason would be to select the UV brightness factor. They range from cool glow to blazing glow- will be easier to balance glow and color.
And yes, the color can completely change when UV light is applied.

Now how much UV affects a fished fly and fish- who knows. Bright sun, cloudy day, evening shade? Time to experiment.