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Planted Aquarium Lighting


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I have looked into the Nicrew SkyLED 18" and was wondering about the PAR and Lumens. On the specs it says the PAR is 63@12 inches IN AIR. It says that the Lumen is 70 lm. I was wondering two things, how should I calculate the PAR to in water and do the lumens need a conversion to be accurate for water. 


Edited by Jack
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