I have two Viparspectras on my 55 gallon tank that I turned into a grow out/frag tank. The PAR readout on the sand is 150 on a 24 inch tall tank with the lights at 30% blue, 1% white. I mounted them by rigging a $10 garment rack from target and they’re doing great at 10 inches above the water line. If it were a display tank, I would eventually get a blade for visual appeal and turn off the white altogether on it but the reality is that you don’t really need it. Super solid lights and the price is unbeatable for the power and spectrum. Here is my setup on all blue at the end of the cycle: