SciGuy: Hit the nail on the head.

Let me shed a little light on this subject as I have done a lot of research. This is kind of a simplified explanation. Using a UV light to check out your lures is fun but all it will really show is what lures are fluorescent. Fluorescent lures most of the time are hot pink, chartreuse, cerise, some oranges and white. Fish do not see fluorescent colors any better than regular colors that we see. UV is a light spectrum that we cannot see with our own eyes.

There have been some arguments that steelhead and salmon do not see UV once they leave fresh water, this simply is not true.

There is overwhelming evidence that all spiecies of salmonids see and use UV at ALL stages of thier life cycle, that is to say before, during, and after smoltification.
UV Research

And in multiple spiecies of salmon : Multiple Species UV

These articles not only show that UV is a life long sight process, that it is intended for finding food...oops forgot that link (SpringerLink ) and that it intensifies as they reach maturity starting when they move into less than 40 ft of water. It is an effective way to catch multiple spiecies of fish. New reasearch into salmonids comes out of Canada almost weekly.

There is no secret lure to catching more fish. Just because something is UV enhanced won't make a steelhead move 100 feet to hit your lure. It can in my opinion help an experienced fisherman get an extra fish or two throughout a day or possibly put one fish on the board during a very slow day of fishing. From my tests it only improves a product and in certain condition's I think UV can make a difference.