I've been using two of these on my 150 gallon reef setup. They throw quite a bit of light and my corals are maintaining pretty good. 1 more light would probably be needed for good growth.
This is my second LED grow light and it is simply in a different class than my first set up. This light is very well constructed by someone who cares about quality. It was packed for shipping in a nice, snug custom configuration that provided excellent protection. Plug it in and the brightness will amaze you. I would not hesitate to buy this unit again.
Use it like a 400w hps except it has no problem with heat. It seems to be a good flowering light, and a great vegetative! Definitely a great deal.
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