DSunY174; Ultra-Thin No Fan Noise LED Aquarium Light Fixture Reef Fish Tank Light/Reef Capable Light (168W Output, Blue/White Ratio- 28:28; One Year Warranty) - 48 Inch This LED system has a wide-angle beam that allows them to be placed close to the aquarium surface for optimum light penetration and even light distribution. Dimmable and programmable. With use of the digital Controller. You have complete control over the lighting effect on your aquarium. Easily create Moon/Noon/Spring/Autumn/Summer/Winter/Lunar Cycle modes. Less noise! Due to the low voltage system and cooler operation, noisy fans are not required which also means less water evaporation. This LED system allows you to quickly build a custom, professional looking and functioning system with minimum tools. Please connect the two panels together before powering them up, in other words, if you power the system up with only one panel, the system may go down.