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I follow Greggz and try to emulate what he does; as his tank is insanely beautiful. So hopefully this will give some insight to those who want to dig a bit deeper. Burr740 is Joe Harvey fyi.

Pulled from here.




Edited by Mmiller2001
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Hi @gardenman, there is a video that I could not find unfortunately of when Cory did exactly that in one of his old outdoor ponds. If I remember correctly, the par reading was way high though. It was not even comparable to our aquariums with artificial lighting haha hopefully someone knows which video I am talking about and they can link it here. 

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I think that most commonly when we use PAR for planted tanks, that the units we are measuring in are micro-mols per meter squared per second, which is equivalent to the slightly more accurate and technical term PPFD (photosynthetic photon flux density). If that's the case, then yes, sunlight has a much higher ppfd than even the strongest planted tank lights (at least according to this one source I quickly found): https://www.ledtonic.com/blogs/guides/sunlight-ppfd-measured-over-an-afternoon

Video about units for PAR vs PPF vs PPFD:


I feel like we should start saying PPFD instead of PAR, but I've never actually used a PAR meter and don't know what units they give for results. I know that on plantedtank.net, I've started to see PPFD used more, though PAR is still commonly in use.

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