Not as bright as it looks, enough power to break through the water for coral to grow. Easily retrofittable. They have only been in my tank for 2 weeks. Let's see how waterproof they are, but for now they're holding up well. It's white, it's just for us to look inside the tank. Blue and full spectrum are good for coral, mine seems to be thriving and reaching for the light. I have 3 of these, this one is white. Full Spectrum and Blue, they are all connected and perfectly match the Ledenet dimmer. Love them and they provide ample light for corals, great for pure fish systems and great if you want to upgrade your aquarium without going broke.
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