There all low level requires corals you can get away with 1watt diodes. I have the Marineland reef LED price was right but, they can't not be hung over a topless tank, the mounting legs are to short and they are not dimmable, Wow after that review I don't want my light either. Any fixture will do LED is the way to go, last longer 50,000 hours, less electricity used, low heat and shimmer effect. I would take a look at the Apollo Reef fixture they are running a sale, good price.