I get a little confused about fluorescent, phosphorescent, UV and now I see UV2. I'm not sure I really understand the differences or pros / cons of each.
However, I do like some brightness and flash in flies at times especially those that are fished deep or those that are used in stained water. I have used quite a bit of UV Ice Dub in recent years and I do like it. It seems to work very well. I sometimes use it mixed with natural or other synethic materials or for a flashier fly, I use it straight,