I watched my corals go crazy about a week after installing this light. For the price unbeatable. The only limitation I noticed was that there is no "shimmering effect" on the water like units with larger LEDs installed. Because the LEDs in this light are so small (but there are so many more), the light reflected off the water's surface is more like a reflection of fluorescent light with no noticeable movement of the water - more like a spot of light. This differs from the Coralife device, for example, which has much larger LEDs, but fewer of them. This device creates a shimmering reflection of light that bounces off the water's surface creating a truly soothing image on surrounding walls and objects - similar to what natural sunlight creates on the surface of a pool of water, as that is the only point. bright. Just one observation - my main concern was the health of my tank and coral and he certainly addressed it!
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