The big issue I have read about with Lumenarc is that they spread the light out so much, they are producing garbage PAR readings compared to some of the newer types of reflectors..
Here's my take on the others..
I love the way Lumenbrites look.. If I was hanging them, that would be my #1 choice.. Mounting in a canopy though, I would go for the lumenmax elite..
In fact.. The only reason I don't switch to the LB over LME's is I already have 2 of the 3 I need for the new tank..