I run 9 AI's on my 300 and I believe I could have gotten away with 6 only but I like my tank nicely lit and with all the sps I was even contemplating on 3 more. One thing that I should mention is my AI's are mounted 6 inches above water line so I can get more intensity from them, on the other hand my buddy Peter is running 3 on his 210 with decent coverage but his lights are mounted 12-14 inches awl. It really does boil down to what suit you the best. I would get 3 and see how it looks first and then decide form there. I have a biocube with DIY 24 cree leds but I like the AI's way better. I haven't had the chance to try the radions but I can tell you they do not put out more par then the radions(reef builder dr sanjay's led write up) so if anyone tells you 1 radions = 2 ai sols I would highly dissagree with that statment.
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