The scientific premise of UV lures is simple -fish see colors as if they were under a blacklight.These lures are truly eye-popping the way humans see them, but if you put them under a black light you will truly be amazed at the way the fluorescent colors and fluorescent orange bead stands out and calls out to passing fish. This makes these lures particularly effective on cloudy days or in murky or muddy waters. Great for trout, salmon & steelhead. Because these UV colors are so eye-popping, they are also very effective in low light conditions. They will catch many other species. A UV Hammered blade reflects light throughout the whole surface area of the blade producing a kaleidoscope of continuous lightning flashes that is hard to miss and hard for the fish to resist.