Mike, that's a really big question, with a ton of variables.
It's kind of like asking- 'money not being a factor, what the best car is'.
If you follow the research, anything capable of producing a PAR value above 300 will do... Until you find out about PUR (usable PAR
If I remember correctly, a 210 is about 30 inches deep (?). It also depends on where you place the SPS (distance from lights).
I would encourage you to do as much research as possible. Then, after you have narrowed the choices to a few, try to see them all in person.
I can't begin to tell you how many have bought and sold lights because they 'didn't have the look I'm trying to achieve'.
I will summarize this way. There are at least two major areas of criteria when selecting lighting for a reef tank.
1) There's the technical aspect. Does it produce the PAR/PUR at the distance required for my corals to be able to thrive, etc.?
2) There's an aesthetic aspect. Does it produce the 'look' I prefer?
The above two must both be feasible, using your choice of LED. Otherwise YOU won't be happy, and that's THE most important criteria, no?
I know you are looking for others input to help you make a selection, but in my opinion, that's like asking someone to pick out a dish, eat it, then tell you how they like it. Then, you order it only to discover that you can't stand chitterlings! (I'm a southern boy)
This is from a guy that understands light, has done high level R&D and designed systems from micro watts to kilo watts.
I can't answer your question any better than this.
-Bill
