Par data on 24" deep 120 gallon
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Old 01-19-2014, 07:23 PM   #1
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Par data on 24" deep 120 gallon

Got loaned a PAR meter so I could check PAR on my 120. -gallon moderately planted goldfish tank.

I currently have the Marineland 48" Aquatic LED for freshwater planted, and two Marineland 17" hidden LED mounted to front.

I also got the Finnex Planted Plus and Ray2 and deciding which of those to keep.

I dose Flourish and Excel and plants are low to medium/high requirements.

PAR Data at 24" depth with water, 48" fixtures:

Middle of tank:
Marineland Aquatic: 46 PAR
Panted+: 20 PAR
Ray2: 35 PAR

With ML and Finnex fixtures:

Planted+: 55
Ray2: 72

Middle edge:
Planted+: 45 PAR
RAY2: 58 PAR

Planted+: 10 PAR
RAY2: 19 PAR

So basically with all lights on at middle/center the difference in PAR is approx 15 PAR.
Planted+: 60 PAR
RAY2: 75 PAR

So again trying to determine best for my plants without algae issues without Co2 between the Ray2 or Planted+

Thoughts anyone?

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Old 10-25-2014, 02:18 AM   #2
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With no CO2 I've had great luck shooting for around 20 par at the substrate, and adjusting up or down from there based on algae as the tank matures.

If it were me I would probably keep 2 fixutres for better coverage over the 24" wide tank. I would then raise them as nessessary to achive the PAR needed, this will also help light spread.

If you like the color equally between the Ray 2 and the Planted + I would choose the one that matches your existing fixture best in light output and color then raise both to set light. This would give you room to lower if you find you want more light later.

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Old 10-25-2014, 02:28 PM   #3
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aim for less par. i have a 75g with a single planted plus and i am forced to raise it above 21" now trying for 23-24" to avoid the last bit of gsa that is being a bit of a problem for me.

if i was use i would stick with the lower par. 20-30 par for low tech is enough you don't want more.
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