I cover a 6' tank with two Lumenmax pendants no problem, but my lights are a little higher up (~10") off the water to provide a greater spread. I don't see any significant loss in growth and, if anything, this has cut down on salt spray/splashing on the reflectors as well as heat.
This setup allows me to put my clams/sps directly under while I put the LPS off to the edges more given the difference in intensity. Whatever the case there's still plenty of light to go around.
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