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I have a 75 gallon planted tank. It has a footprint of 48" x 18". The beamswork da fspec 48" is 3.5" from the top of the water. The water is 18.5" deep. I have a Seneye meter which gives me PAR, PUR%, and a graph of the light reading covering 400-700nm. This unit was reviewed by some reef people and I feel good about the quality.


So here is my question. I am getting PAR reading with the tank full of water and planted along the lines of:

Directly under the light a few inches underwater:


------------------------------------------
At the front glass at the gravel line:


------------------------------------------------

So my question is this. Do I assume the PAR readings are what shows on the meter or should I be taking that PAR number and multiplying it by the PUR percentage to get the true PAR reading that the plants can use?

The reason I am wondering is when I look at the 400-700 graph I see a lot falling in the middle...

Would you call this LOW, MEDIUM, or (obviously not) HIGH LIGHT

I keep coming back to a post about Amano tanks having 50 PAR at the front edge gravel line and I just wonder.

Thanks,

Dave
 

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I have a 75 gallon planted tank. It has a footprint of 48" x 18". The beamswork da fspec 48" is 3.5" from the top of the water. The water is 18.5" deep. I have a Seneye meter which gives me PAR, PUR%, and a graph of the light reading covering 400-700nm. This unit was reviewed by some reef people and I feel good about the quality.

https://www.youtube.com/watch?v=6hUkufXBb3I&t=8s

So here is my question. I am getting PAR reading with the tank full of water and planted along the lines of:

Directly under the light a few inches underwater:


------------------------------------------
At the front glass at the gravel line:


------------------------------------------------

So my question is this. Do I assume the PAR readings are what shows on the meter or should I be taking that PAR number and multiplying it by the PUR percentage to get the true PAR reading that the plants can use?

The reason I am wondering is when I look at the 400-700 graph I see a lot falling in the middle...

Would you call this LOW, MEDIUM, or (obviously not) HIGH LIGHT

I keep coming back to a post about Amano tanks having 50 PAR at the front edge gravel line and I just wonder.

Thanks,

Dave

Good read..
https://barrreport.com/threads/ada-lighting-at-aqua-forest-and-nice-low-par-values-who-knew.4865/
 
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