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Well, they are all nice. The arc's penetrate better for deep tanks, the brights and elite's are better for wider tanks imo.
You can light 36x36 beautifully with the large LB's or Lumenmax Elites. They even have better PAR numbers then the lumenarcs. Melev has a writeup on this somewhere.
Myself and JNye used his PAR meter to test this out for ourselves as well. The large LB's blew the large Lumenarc's out of the water. The Lumenmax 2 I had was also better the the Lumenarc within 24" of the pendant.
What you need depends on your application. Both Lumenbrights and the Lumenmax Elite will work for you.

