what is ppfd? and how does it differ from par? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 06-20-2020, 07:56 PM Thread Starter
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what is ppfd? and how does it differ from par?

ppfd is an acronym for...?
is it similar to par?

thanks.
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post #2 of 5 (permalink) Old 06-20-2020, 08:17 PM
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PAR is just photosynthetic active radiation, which just describes the wavelengths of light required to support photosynthesis in plants.

PPFD is photosynthetic photon flux density, which refers to the density of photons that actually make it to the plant cell, which also at the same time, can support photosynthesis.
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post #3 of 5 (permalink) Old 06-21-2020, 12:09 AM
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Quote:
Originally Posted by moke View Post
ppfd is an acronym for...?
is it similar to par?

thanks.
Par is the commonly misused term for PPFD.
quantum meters (LiCor ect) measure PPFD.
Think of that as PAR/Meter squared/second.


https://www.ledgrowlightsdepot.com/p...-dli-uncovered




Bottom line: When people say "PAR" they usually mean PPFD..

"A man with a watch knows what time it is. A man with two watches is never sure"
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post #4 of 5 (permalink) Old 06-21-2020, 12:49 AM
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Quote:
Originally Posted by jeffkrol View Post
Par is the commonly misused term for PPFD.
quantum meters (LiCor ect) measure PPFD.
Think of that as PAR/Meter squared/second.

https://www.ledgrowlightsdepot.com/p...-dli-uncovered

Bottom line: When people say "PAR" they usually mean PPFD..

So, when I started this hobby I was under the impression it would be easy. Very little math, no chemistry, no big words....
LOL - that was a bit of a lie


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post #5 of 5 (permalink) Old 06-22-2020, 06:51 AM
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So, when I started this hobby I was under the impression it would be easy. Very little math, no chemistry, no big words....
LOL - that was a bit of a lie
The old joke goes something like "Biology is just chemistry. Chemistry is just physics. Physics is just math. Math is everything"
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