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Discussion Starter #1 (Edited)
Got a great deal on an apogee SQ-520. The tank is covered in algae due to some experiments...
1026388

Figured I'd share some of my data:

Tank: Aquamaxx 22 long (12" deep, 36" wide)

Twinstar 900E, 60W RGB LED
Just Below Water:
Peak Par: 220 umol m^-2 s^-1
Edges: 180 umol m^-2 s^-1

Bottom:
Peak Par: 120 umol m^-2 s^-1
Edges: 65 umol m^-2 s^-1

UNS Titan 1, 90W RGB LED, 15" above surface
Just Below Water:
Peak Par: 250 umol m^-2 s^-1
Edges: 105 umol m^-2 s^-1

Bottom:
Peak Par: 160 umol m^-2 s^-1
Edges: 80 umol m^-2 s^-1

Tank: Standard 10g (No Water. emersed)
Current USA Satellite Plus, 13W

AVG PAR: 60 umol/m^-2

Tank: ADA 30c (30cmx30cmx30cm)
Kessil A80 Tuna Sun, 13W, through ADA glass lid

Just Below Water:
Peak Par: 100 umol m^-2 s^-1
Edges: 80 umol m^-2 s^-1

Bottom:
Peak Par: 60 umol m^-2 s^-1
Edges: 50 umol m^-2 s^-1

Tank: Nuvo 14g Peninsula
2x Kessil A80 Tuna Blue, 2x 13W + 1x AI Prime 16HD @ 48W


Just Below Water:
Peak Par: 480 umol m^-2 s^-1
Edges: 280 umol m^-2 s^-1

Bottom:
Peak Par: 200 umol m^-2 s^-1
Edges: 100 umol m^-2 s^-1

Tank: ADA Mini M
Twinstar 300EA, VERY cloudy water
Peak Par: 70 umol m^-2 s^-1
Bottom: 20 umol m^-2 s^-1

Tank: Patio Greenhouse
Noon Sun

Top Rack: 800 umol m^-2 s^-1
Middle Rack: 550 umol m^-2 s^-1
Bottom Rack: 400 umol m^-2 s^-1

Ambient PAR with light overspill and windows: ~3-6 umol m^-2 s^-1


Conclusions:
Twinstar lights are putting out for me less light than anticipated but that's ok. The UNS titan is quite bright, brighter than I expected with the wattage. The kessil A80 put out higher numbers than what people have previously reported. It could be due in part improved immersion correction and full spectrum nature of the SQ520 over older/lower end apogee meters. The sun is incredibly bright and it's pretty surprising how little light we actually give our plants. Light overspill from neighboring tanks and through windows is probably not a significant driver for algae, considering it's less than 3 umol m^-2 s^-1 for most of the day.
 
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Discussion Starter #3
Thank you for this!

I love my par meter (apogee 420) to an unreasonable degree. The price tag is high enough that its hard to justify ever recommending someone buy a par meter but now that I have one I use it constantly when setting up a new tank and fine tune lighting exactly where I want it.
I agree. I honestly think if you set up multiple tanks it will end up being worth its cost anyways in terms of time, materials and energy wasted trying to get your lights set up. Not to mention it’s quite useful for gardening.
 

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The kessil A80 put out higher numbers than what people have previously reported. It could be due in part improved immersion correction and full spectrum nature of the SQ520 over older/lower end apogee meters.




hmmm "in air' measurement of the A80 using new sensor..
MQ-510.
Lens design matters though..
Average 38PAR in 12x12 12" height free air.
MQ15 was a typo..

12" free air Hort version.. Average PAR at 12" height 12" area is about 48PAR
Li-Cor sensor.
1026410


Point is w/ a decent lens system 50PAR from a 14 Watt light is common and not unexpected.

Now given "newer" sensors and yours I'm curious as to how yours compares.
 

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Discussion Starter #5 (Edited)
I think that is referring to the tuna blue. I actually have both the tuna blue and the tuna sun the quoted par measurements I give are for tuna sun. I have the two tuna blues mounted on my reef with an AI prime. I could do a side by side of the two if youre interested. Could give a sense of just how underreported par measurements are for blue kessil lights.

Edit: just reread your post. I think you are right that it may be expected but those in- air measurements seem grossly incorrect or low. Or the lenses on the kessils reduce the backscatter through water immensely.
hmmm "in air' measurement of the A80 using new sensor..
MQ-510.
Lens design matters though..
Average 38PAR in 12x12 12" height free air.
MQ15 was a typo..

12" free air Hort version.. Average PAR at 12" height 12" area is about 48PAR
Li-Cor sensor.
View attachment 1026410

Point is w/ a decent lens system 50PAR from a 14 Watt light is common and not unexpected.

Now given "newer" sensors and yours I'm curious as to how yours compares.
 
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