Beamswork DA FSPEC 48" - The Planted Tank Forum
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post #1 of 4 (permalink) Old 09-30-2020, 02:52 AM Thread Starter
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Beamswork DA FSPEC 48"

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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post #2 of 4 (permalink) Old 09-30-2020, 03:53 AM
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I see the PAR of this LED light on this source, the PAR is 96 at 12-inch depth, measured under a 24-inch fixture. So, I think it works for most types of plants.

Last edited by suppercat; 10-02-2020 at 03:09 AM. Reason: wrong link
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post #3 of 4 (permalink) Old 09-30-2020, 06:43 AM
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Quote:
Originally Posted by daa13157 View Post
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-l...who-knew.4865/
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post #4 of 4 (permalink) Old 09-30-2020, 12:34 PM
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Quote:
Originally Posted by jeffkrol View Post
That makes a lot of sense. Thanks for the good read! I've been actually dialing back my lighting in my 22G, but kept duration the same.


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