Gazz I can't comment on the "HyperViolet" but I do know from first hand experience that "Violet" LED make some coral really pop that otherwise may not. It's very much like the "Purple" tint some T5 manufacturers (Higher End manufacturers) have incorporated into their bulbs over the last couple of years. From my LED experience the "Violets" make certain oranges and certain reds really POP with color. I would "guess" that this is what the HyperViolet might do as well.

In my tank here in my office (custom DIY LED) I have 4 Violet LED for this reason alone. Just the 4 Violet LED cost me almost $100 USD when everything was said and installed.

This is completely assumption going from my own personal experience with my LED.