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They both should be set arround the 15-20in height. The larges spread the light out more for larger tanks. Right now with my tank the light does not bleed outside of my tank on the floor, yes I am beeing completly honest. My trim around the tank is left in the shaddows. This is what makes these reflectors so perfect. All the light is directed into the tank and not the surounding room. I would say tank widths up to 32 inches should use the Minis. Anything wider go with the larges. If you place the larges on a tank not wide enough you will be waisting light and will not be getting optimal performance from these reflectors.
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180 Gal Reefready, 75 gal Sump/Fuge, Reeflo 200 skimmer, 3 250 Reeflux Bulbs in Lumen Bright reflectors powered by coralvue electronic ballasts, PM Kalk reactor, 2 Vortechs, Geo 618 calcium reactor
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