need info on PAR meters - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 08-03-2020, 02:18 PM Thread Starter
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need info on PAR meters

Hi Everyone!

I have a good friend who owns a PAR meter for his saltwater reef tank. Would I be able to use this to check the PAR in my planted tank as well, or are they going to be measuring different things? I know that reef tanks and planted tanks use completely different light spectrums, and I honestly have no idea how PAR meters even work in the first place.

As an example, if the meter doesn't recognize red light because it's calibrated for the reef tank, then I might turn my lights way, way higher than they should be because I think my PAR is low.

If you ever think you're too small to make a difference, spend a couple of nights sleeping with a mosquito.

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post #2 of 3 (permalink) Old 08-03-2020, 03:25 PM
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Quote:
Originally Posted by jellopuddinpop View Post
Hi Everyone!

I have a good friend who owns a PAR meter for his saltwater reef tank. Would I be able to use this to check the PAR in my planted tank as well, or are they going to be measuring different things? I know that reef tanks and planted tanks use completely different light spectrums, and I honestly have no idea how PAR meters even work in the first place.

As an example, if the meter doesn't recognize red light because it's calibrated for the reef tank, then I might turn my lights way, way higher than they should be because I think my PAR is low.

PAR is defined as the light between 400-700nm.

None really can be calibrated for a reef tank.
It doesn't discriminate nor compensate in this range (Look up PUR as an example of compensating).

That said each "PAR" ( really measures PPFD, not "PAR") meter has sensativity strengths and weaknesses..


You have more of a likelihood of getting wrong measurements by setting it to air vs water, or in some cases electric vs sun.
A LOT of 660nm or lower red may be problematic for some meters but in general it's not an issue.



https://www.seneye.com/light/par
https://www.aquarium-pond-answers.co...hting.html?m=1

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post #3 of 3 (permalink) Old 08-03-2020, 03:29 PM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
PAR is defined as the light between 400-700nm.

None really can be calibrated for a reef tank.
It doesn't discriminate nor compensate in this range (Look up PUR as an example of compensating).

That said each "PAR" ( really measures PPFD, not "PAR") meter has sensativity strengths and weaknesses..


You have more of a likelihood of getting wrong measurements by setting it to air vs water, or in some cases electric vs sun.
A LOT of 660nm or lower red may be problematic for some meters but in general it's not an issue.



https://www.seneye.com/light/par
https://www.aquarium-pond-answers.co...hting.html?m=1
Thank you very much for the info. This makes me feel better that they're not specific to the wavelength that they're capturing.

If you ever think you're too small to make a difference, spend a couple of nights sleeping with a mosquito.

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