The long and the short of it is that UV optical brightner enhances the visibility of the supstrate. It's intensity degrades through the depths, however still minutely visible to some species below 200ft. You light will be the most intense indicator of both UV and glow. Glow will absorbe and retain lumination for a period of time where UV will enhance and reflect colour tone creating and illution of depth in the substrate. Not all TOMIC UV designated plugs are created equally even though the may share similar product number designations. RVP series plugs have two significant code indicarors. RVP is simply a standard UV finished lure where the RVP2 is a winning combination of enhancement techniques added to the plug to offer the best illusion and all depths. RVP2 combines both glow and UV properties along with high light and colour shifting insert tapes to gain great effects depending upon the depths.
Some of TOMIC's standard plug numbers have combinations of the above mentioned, the RVP & RVP2 are specific. For example RVP2-602PSii