I think this lamp is a really good choice for a rimless nano reef aquarium with 16 1W LEDs. I have no way of measuring the PAR, but I set it 14 inches above the sandy bottom of my nano and my stone anemone flower crept into the shade. (This is with a glass cover on the tank. Some precautions: 1. Be careful when assembling the lamp and tightening the screws. 2. Do not use it over an open-top tank. 3. It has no switch; I planning to buy a timer 4. This is made for reef aquariums There is a daylight version for aquariums with plants What needs improvement (and additional costs): 1. More stable construction 2. White LEDs are too yellow So uniformly the colors look nice.
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