I know its a hard coral, or perhaps semi hard coral. The green stuff is very soft, like carpet, but if I do a water change, it all retracts into the exoskeleton which is quite hard. I'm just not sure of the name.
For lighting I have the Orbit Current USA. 260 watts on a 50 gallon. Works great, has built in fan and 3 different outputs so you can time them differently. I had a crappy Chinese light system before that had the ballast die every 6 months (Never get Heleos). This is way better.