Yea your right only SE but he didn't say which one he was looking for, In that case I would go for the Helios the par is even better then the Radium and your get that same wonderful blue like the phoenix but higher par.
This is from Fragfamer.com
This bulb has the pop that you have been looking for. If you are looking for that extra edge, then look no further. We use these on our systems and the corals love them. According to Sanjay's test, these actually have more Par than radiums! I know of two top online coral sites that use them other than us, and they have the same if not better result's than us too! You will not be disappointed with the results.