Unless you can trace the lineage back to the Miyagi, I might suggest that you call it Miyagi-like. It won't matter to most, but this might save you a serious headache if you trade/sell to certain people who were wanting the real deal.
Whatever it is, it is a cool piece. If it is Miyagi-like, then it can take all of the good light that you can throw at it. The more light that I give it, the more the green and purple really pop. It is a deeper coral, so too much white LED might damage it, so if you are rocking LED, then keep them low IMO.