Hey i just bought lighting for my new tank and i was recomended the perpendicular ones and i mounted them paralle. I ask some of the guys from JL's and the best they could give me was that they were designed to run "perpendicular" so whatever i mounted them paralle. I figured it be better for the air flow for my canapy fan to cool better. Whatever i don't think it matter that much. And if i'm wrong w/e its good thing i bought the expensive lights lol
Kyle
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