Review on Upgraded KZKR 11 to 78 Inch Full Spectrum Aquarium Light - Adjustable Remote Control Fish Tank Lamp for Freshwater and Saltwater Marine - White and Blue Lighting by Natalie Martin

I have this on a 180 gallon (72 inch diameter) tank and the actual light extends almost the entire width and provides good coverage even at the ends. I don't have tops on this tank so the lantern is hung above the water and relies on adjustable brackets to keep it dry. The lantern sags towards the middle, but it's handy for me that it doesn't fall into the water. To be honest I wouldn't trust mounts on anything wider than 72 inches, once you stretch them there is considerable latitude allowing the weight of the light to flex it more and more. The advertised distance of 78 inches is how far they extend, but they will NOT sustain the light that far. Brightness is good for this tank, not outstanding, but for the price I would say it's good value for money. Make sure you measure the total distance you need before ordering and don't rely on the included brackets if that distance is much more than 72 inches, but overall I would recommend this light to those on a budget have, but still need a good decision.