My units (2) arrived with a damaged cord but I don't think it's the manufacturer just the place I bought it from here on Amazon . I've ordered a couple of these and the high light output is pretty poor, but I'll be supplementing them with a more powerful full spectrum fixed band that offers better illumination for the same size and price point. It also has weak full-spectrum capabilities. multiple colors of different diodes. In principle, warm white and another color can be used to supplement it. green, blue, cyan, pink, red, green, and yellow, but a true full-spectrum LED has multiple diodes at different nanometer scales. Don't just buy them to power a saltwater aquarium, I would only use them as additional lighting to create a special look in the aquarium. FYI, the app and the timer feature are pretty nice
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