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post #16 of 29 (permalink) Old 11-23-2018, 09:38 PM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
That's significantly higher than the chart I posted (52PAR 30cm(11.81") 50W 60cm fixture) even if open air (can't remeber and this site keeps removing my link) vs in water..but???


Yeah, it surprised me too. Iíll take pictures and screen shots for you.


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post #17 of 29 (permalink) Old 11-24-2018, 12:19 AM Thread Starter
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@jeffkrol

I set it back up this time in my bathroom.

Ambient:


Depth:


Measurements:



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post #18 of 29 (permalink) Old 11-24-2018, 12:38 AM
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It is what it is..

Hey looking back I found this:
Quote:
30" DA FSPEC only
13" No water 0" offset
70 par
In water.. 100PAR..

Off topic a bit..Still having a hard time w/ their LUX numbers..

https://support.agi32.com/support/so...r-horticulture
These conversion factors are for kilolux..
soo.....as an example:
4.088 x 14.6 (should be smaller at 6500k) = 59.7..

At that PAR LUX should be around 7500.. NOW I'm not expecting "exact" accuracy.. but that's a bit off..

my "usual" LUX/ 67 at the higher number is 111.9...

I wrote to Seneye twice w/ a different question each time and never got an answer back..
The above and if it's accurate out of water.. crickets..

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Last edited by jeffkrol; 11-24-2018 at 12:50 AM. Reason: edit
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post #19 of 29 (permalink) Old 11-24-2018, 01:15 AM Thread Starter
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Chihiros RGB

Quote:
Originally Posted by jeffkrol View Post
It is what it is..

Hey looking back I found this:


In water.. 100PAR..

Off topic a bit..Still having a hard time w/ their LUX numbers..

https://support.agi32.com/support/so...r-horticulture
These conversion factors are for kilolux..
soo.....as an example:
4.088 x 14.6 (should be smaller at 6500k) = 59.7..

At that PAR LUX should be around 7500.. NOW I'm not expecting "exact" accuracy.. but that's a bit off..

my "usual" LUX/ 67 at the higher number is 111.9...

I wrote to Seneye twice w/ a different question each time and never got an answer back..
The above and if it's accurate out of water.. crickets..


Yeah that is a bit off. By about 3k LUX going off the conversion. Interesting indeed. I know BRS compared it to a much more expensive unit and it was comparable, getting nearly identical results. Now Iím also left wondering if another Seneye unit would yield the same results.

Also, I thought water was supposed to reduce PAR...? Lots of stuff at play here that you likely understand way better than I do. The real test will be the results it yields with plants.

I did take some PAR measurements in the main display tank and was somewhat dismayed. My foreground is getting around 30-40 PAR according to this meter. I wonder if thatís why the staurogyne porto velho is having algae grow on it. There is part of it that is more towards the middle of the tank thatís getting much stronger light and itís algae free and beautiful. I didnít get much of a difference of readings at all with and without the glass lid.


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post #20 of 29 (permalink) Old 11-24-2018, 03:09 AM
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LOL. I just realized something, you can't actually use it out of water because the red LED inside warning you it's out of water starts blinking..

At least I hope that was my issue w/ just now testing it w/ a cyan diode.
Measured 5300-5400k...................
does this look like 5600K? Actually the same thing happened w/ a reefer when testing his light w/ just green..and that was in water..
I'll need to check that..


Quote:
BRS compared it to a much more expensive unit
They only did PAR.. It's just a matter of the LUX being wrong AFAICT.
Think that applies to the K temp too though..
I roughly trust the PAR measurements.. and the "cards" though..
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Last edited by jeffkrol; 11-24-2018 at 03:15 AM. Reason: edit
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post #21 of 29 (permalink) Old 11-24-2018, 03:14 AM Thread Starter
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Originally Posted by jeffkrol View Post
LOL. I just realized something, you can't actually use it out of water because the red LED inside warning you it's out of water starts blinking..



At least I hope that was my issue w/ just now testing it w/ a cyan diode.

Measured 5300-5400k...................





They only did PAR.. It's just a matter of the LUX being wrong AFAICT.

Think that applies to the K temp too though..

I roughly trust the PAR measurements.. and the "cards" though..


I will put that to the test tomorrow but that would explain the discrepancy!


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post #22 of 29 (permalink) Old 11-25-2018, 06:11 PM
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Originally Posted by varanidguy View Post
I will put that to the test tomorrow but that would explain the discrepancy!


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Found it..


PAR Shootout! Seneye Reef Monitor v2 VS. Apogee MQ-510 Full Spectrum Underwater Meter - Reef Central Online Community

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post #23 of 29 (permalink) Old 11-25-2018, 08:12 PM Thread Starter
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Interesting. I wonder whatís contributing to the discrepancy.

I tried it out of the water and the PAR seems to go down every time the light blinks. Itís hard to tell but Iíd assume itís less accurate out of water.


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post #24 of 29 (permalink) Old 11-25-2018, 08:47 PM
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Pretty sue they calculate K values from a RGB sensor..
Like this table..
RGB to Color Temperature | Andreas SieŖ
6500: (255, 249, 253),R,G,B
3800: (255, 204, 153), R,G,B

ect..

Pure green would be 0,255,0.....

5300: (255, 233, 217)

IF it's actually seeing the red diode the numbers could be
255,255, and a bleed over into the blue w/ the green diode spread.. giving a >0 value to blue


Or just a screwed up function in the program

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post #25 of 29 (permalink) Old 11-25-2018, 09:22 PM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
Pretty sue they calculate K values from a RGB sensor..

Like this table..

RGB to Color Temperature | Andreas SieŖ

6500: (255, 249, 253),R,G,B

3800: (255, 204, 153), R,G,B



ect..



Pure green would be 0,255,0.....



5300: (255, 233, 217)



IF it's actually seeing the red diode the numbers could be

255,255, and a bleed over into the blue w/ the green diode spread.. giving a >0 value to blue





Or just a screwed up function in the program


Not to throw a wrench into the whole thing, but would this effect their PUR calculations?


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post #26 of 29 (permalink) Old 11-25-2018, 11:13 PM
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Originally Posted by varanidguy View Post
Not to throw a wrench into the whole thing, but would this effect their PUR calculations?


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Sure but it could depend on where the error is..and intensity of the light..ect..


Sorry this is all guessing but the sort of bottom line is manipulating the data from the RGB sensor..
PUR is probably 100% red, 100% blue and a weighted green.. say 50%..



The "normal" filters are kind of wonky..





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post #27 of 29 (permalink) Old 11-25-2018, 11:17 PM Thread Starter
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Originally Posted by jeffkrol View Post
Sure but it could depend on where the error is..and intensity of the light..ect..


Sorry this is all guessing but the sort of bottom line is manipulating the data from the RGB sensor..
PUR is probably 100% red, 100% blue and a weighted green.. say 50%..



The "normal" filters are kind of wonky..






Interesting. Iíve heard the argument that if you can get a higher PUR % out of your lights, then PAR doesnít need to be so high to get the same efficacy. I know itís all important, but Iím left wondering what a good balance between PAR and PUR is.


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post #28 of 29 (permalink) Old 11-25-2018, 11:40 PM
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The one that looks the best to you..

PUR isn't any more accurate that PAR really.

Well lets put it this way.. PAR is a "standard" PUR is "assumed"...
and "PUR" only differs by the amount of "yellow-green"..
Neither is very SPECIES specific..
As an extreme example PUR if red algae is about the exact opposite as normal "PUR"

Just for reference in nature..

https://www.researchgate.net/figure/...fig4_228373573
Quote:
Vertical profiles of photosynthetically active radiation (PAR, solid line), and photosynthetically usable radiation (PUR) based on measured absorption spectrum (PURm; dashed line) and hypothetical action spectrum (PURh; dotted line) in (a) Belize and (b) the Indian River Lagoon (IRL), Florida. Profi les were normalized to the irradiance incident at the surface (100%).

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Last edited by jeffkrol; 11-25-2018 at 11:55 PM. Reason: edit
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post #29 of 29 (permalink) Old 11-26-2018, 12:11 AM Thread Starter
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Quote:
Originally Posted by jeffkrol View Post
The one that looks the best to you..

PUR isn't any more accurate that PAR really.

Well lets put it this way.. PAR is a "standard" PUR is "assumed"...
and "PUR" only differs by the amount of "yellow-green"..
Neither is very SPECIES specific..
As an extreme example PUR if red algae is about the exact opposite as normal "PUR"

Just for reference in nature..

https://www.researchgate.net/figure/...fig4_228373573


Very interesting, thank you Jeff!


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