PAR #'s

  • Thread starter Thread starter xabo
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Kinda' what I was looking for. I've read that when switching from MH to LED, you want to the match PAR#'s.
It’s a good planyes(minus acclimation) but overall you’ll want to keep an eye on spectrum too.
A 14k 56k MH may not have as much blue as your Led does. So the blue dose is lower. Not that it’s actually a big deal really.
 
Well more so they are speaking the same "language" really..

It's a standard... and implies equal # of photons regardless of wavelength.
"PAR" (black rectangle lines rectangle) Lumens and ONE expression (species dependent, in this case an "average"of species.. McCree curve) of PUR...(or weighted "PAR" if you prefer)
When one converts Lumen measurements to "PAR" this includes assumptions as to the losses based on the measurement..
Every light will have a different conversion factor..Oddly it is pretty similar across many light types..
Just understand it (conversion factor) is an estimate..and has been checked, for accuracy, by many..



PPF is just area-less
1 mole of photons = 6.022 x 1023 photons. 10 to the 23rd power..but load o photons
uMole 10 minus 6 of a mole.

Photosynthetic-light-response-curves-1.jpg
Dang, I’m going to have eat lunch before I Digest this. Lol.
But yea. Absolutely.


In shorthand , a 56k Light has all the stuff a coral needs. And a bunch it doesn’t. So yea, you might need a bit more overall (in par or lux)
As the individual (or grouped )wavelengths with a low kelvin Light.
Those wavelghts are hard to identify of most of us. We can just look at the specs (or buy a spectrometer).

Ignore the brand and spectral curve here. Look at the cloraphyl and Cartenoid targets in the first graph instead. (It the only one on my phone)
07F80009-2F95-462B-8AB3-28CAA79E50D3.jpeg
A1094EEB-A4ED-4164-8FAD-60E229105846.jpeg
7537776E-A300-4D26-83E6-080DC022AB45.jpeg
 
Salty: the more I try to understand reading articles and web sites, the more confused I become with the different opinions..LOL!
Grandis.
To be simple (easy for me , a simpleton) it’s easiest to understand, What ALL a par meter is looking for. Blue reds yellow and orange (Marine and terrestrial )
It’s up to the reefer to understand what the coral needs. And pic spectrum.

It’s why I understand the lux meter for a tank.
I know the spectrum , then I can set the how much (intensity)

Oddly, as we say lux is only an estimate of par , par is actuall only an estimate as well in way.

So swapping lights, it’s good to target the par(or lux) intensity, but you’ll still have to search for that sweet spot.
https://www.reef2reef.com/threads/how-to-find-your-led-intensity-sweet-spot.308181/#post-3785697
 
To be simple (easy for me , a simpleton) it’s easiest to understand, What ALL a par meter is looking for. Blue reds yellow and orange (Marine and terrestrial )
It’s up to the reefer to understand what the coral needs. And pic spectrum.

It’s why I understand the lux meter for a tank.
I know the spectrum , then I can set the how much (intensity)

Oddly, as we say lux is only an estimate of par , par is actuall only an estimate as well in way.

So swapping lights, it’s good to target the par(or lux) intensity, but you’ll still have to search for that sweet spot.
https://www.reef2reef.com/threads/how-to-find-your-led-intensity-sweet-spot.308181/#post-3785697

Yes, always need to start somewhere..
Done w/ lunch??? ;)
https://www.researchgate.net/figure...malised-absorption-spectrum-of_fig1_268232275
I'm just the messinger..
 
To be simple (easy for me , a simpleton) it’s easiest to understand, What ALL a par meter is looking for. Blue reds yellow and orange (Marine and terrestrial )
It’s up to the reefer to understand what the coral needs. And pic spectrum.

It’s why I understand the lux meter for a tank.
I know the spectrum , then I can set the how much (intensity)

Oddly, as we say lux is only an estimate of par , par is actuall only an estimate as well in way.

So swapping lights, it’s good to target the par(or lux) intensity, but you’ll still have to search for that sweet spot.
https://www.reef2reef.com/threads/how-to-find-your-led-intensity-sweet-spot.308181/#post-3785697
That is a very good simple way to put...
Thanks for the link!
Grandis.
 

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