Yeah I saw that in his original explanation of the testing procedure but does it state anywhere what the correction corresponds to in regards to how high above the tank the LED would be mounted or does that not matter too much.
For example, does his 24" graph correspond to 24" of water; 18" of water and 6" of air; or 12" of air and 12" of water? I didn't find anything that related to that specifically but I just took a quick read of the articles.
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