Would this be high light ? - The Planted Tank Forum
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post #1 of 27 (permalink) Old 05-30-2017, 05:24 AM Thread Starter
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Would this be high light ?

Hello would 1 fluval 2.0 be high light for an ADA 120-p.

120cm/45cm/45cm
or
48in/18in/18in




The actual light is 48in long
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post #2 of 27 (permalink) Old 05-30-2017, 06:49 AM Thread Starter
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One fluval 2.0 , high light, anyone ?
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post #3 of 27 (permalink) Old 05-30-2017, 03:47 PM
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High enough to grow ludwigia white

i'd label your light and depth in the medium-high category, in between
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post #4 of 27 (permalink) Old 05-30-2017, 03:51 PM
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From what I know of the light I would say probably not. When you start getting past 12 inches width, most go with 2 led strips of that ilk (Current, Finnex, etc). Have you looked at sbreeflights?
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post #5 of 27 (permalink) Old 05-30-2017, 03:58 PM
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I would say more like low/middle of med light based off par data. About 60 par in the middle at 18" so 2 of these may get you to high light but I am no expert.

Dan
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post #6 of 27 (permalink) Old 05-30-2017, 04:05 PM
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High light is often considered at least about 50 PAR at the substrate, so if your light will give you 60 at 18", you are probably good with one light IMO.

https://www.plantedtank.net/forums/10...ar-values.html

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post #7 of 27 (permalink) Old 05-30-2017, 04:12 PM
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Originally Posted by Bunsen Honeydew View Post
High light is often considered at least about 50 PAR at the substrate, so if your light will give you 60 at 18", you are probably good with one light IMO.

https://www.plantedtank.net/forums/10...ar-values.html
I would have to disagree with 50 par being high light. It may grow high light plants but I would not consider it high light. 80par I would consider high light but I am no expert. I have done a lot of reading and almost everywhere this seems to be the standard. Again it doesn't mean you can't grow high light plants at 50 par.

Added: Let me explain why I feel that way. 60 par smack dab in the center but as you move away from the center the par will drop so when you look at the tank as a whole some spots will be maybe 30ish par, definitely not high light by any standard. that's why I recommended 2 of these to put it at high light. You now can work with high light plants anywhere in the aquarium not just the highest par location and end up having high light plants elsewhere performing sub par (pun intended).

Dan
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Last edited by Dman911; 05-30-2017 at 04:20 PM. Reason: Added
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post #8 of 27 (permalink) Old 05-30-2017, 05:01 PM Thread Starter
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Originally Posted by sevendust111 View Post
From what I know of the light I would say probably not. When you start getting past 12 inches width, most go with 2 led strips of that ilk (Current, Finnex, etc). Have you looked at sbreeflights?


Alright I bought one of the fluval 2.0's yesterday and it seemed very bright. I planned on getting two but I was just asking if one would do it.
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post #9 of 27 (permalink) Old 05-30-2017, 05:06 PM
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Originally Posted by Dman911 View Post
I would have to disagree with 50 par being high light. It may grow high light plants but I would not consider it high light. 80par I would consider high light but I am no expert. I have done a lot of reading and almost everywhere this seems to be the standard. Again it doesn't mean you can't grow high light plants at 50 par.

Added: Let me explain why I feel that way. 60 par smack dab in the center but as you move away from the center the par will drop so when you look at the tank as a whole some spots will be maybe 30ish par, definitely not high light by any standard. that's why I recommended 2 of these to put it at high light. You now can work with high light plants anywhere in the aquarium not just the highest par location and end up having high light plants elsewhere performing sub par (pun intended).

Dan
I don't necessarily disagree, but it is easier (or at least cheaper) to add a 2nd light if needed. Another benefit of a second light is that it would make it easier to light the tank evenly front to back and increase the high light footprint. You are correct though that there a range of opinions here, and this is also demonstrated in the link that I posted. In such situations, I usually defer to the experts (Tom Barr and Hoppy).

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post #10 of 27 (permalink) Old 05-30-2017, 05:34 PM
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Quote:
Originally Posted by SKYE.__.HIGH View Post
Hello would 1 fluval 2.0 be high light for an ADA 120-p.

120cm/45cm/45cm
or
48in/18in/18in




The actual light is 48in long
Hi @Skye_HIGH,

Your tank is approximately 17.7" deep; allowing a couple of inches for substrate 16" deep; at full output the Fluval Fresh and Plant 2.0 will provide slightly less than [email protected] at the substrate level....definitely high light!! How do I know? I have two of the Fluval F&P 2.0 and access to an Apogee PAR Meter and have checked the output.
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post #11 of 27 (permalink) Old 05-30-2017, 05:39 PM
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Quote:
Originally Posted by Seattle_Aquarist View Post
Hi @Skye_HIGH,

Your tank is approximately 17.7" deep; allowing a couple of inches for substrate 16" deep; at full output the Fluval Fresh and Plant 2.0 will provide slightly less than [email protected] at the substrate level....definitely high light!! How do I know? I have two of the Fluval F&P 2.0 and access to an Apogee PAR Meter and have checked the output.
That is with 2 lights correct?

Dan
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post #12 of 27 (permalink) Old 05-30-2017, 05:44 PM
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Originally Posted by Dman911 View Post
That is with 2 lights correct?

Dan
Hi Dan,

That would be with just one (1) Fluval F&P 2.0 fixture on the subject tank.

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post #13 of 27 (permalink) Old 05-30-2017, 05:47 PM
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Originally Posted by Seattle_Aquarist View Post
Hi Dan,

That would be with just one (1) Fluval F&P 2.0 fixture on the subject tank.
Wow that's vastly different then what I have seen claimed by fluval. here is one that says 66 @18" the other I read is [email protected]". IDK you have the par meter but that's more than double what fluval claims.

Aqualife & Plant Performance LED | Aquarium Lighting | Fluval

Dan

Bump: Is this the 3991 or 3992 we are talking about? Both will work for 48"

Dan
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post #14 of 27 (permalink) Old 05-30-2017, 05:53 PM
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Quote:
Originally Posted by Seattle_Aquarist View Post
Hi Dan,

That would be with just one (1) Fluval F&P 2.0 fixture on the subject tank.
That is a bit higher than what Fluval has listed on their site.

Aqualife & Plant Performance LED | Aquarium Lighting | Fluval

Bump:
Quote:
Originally Posted by Dman911 View Post
Wow that's vastly different then what I have seen claimed by fluval. here is one that says 66 @18" the other I read is [email protected]". IDK you have the par meter but that's more than double what fluval claims.

Aqualife & Plant Performance LED | Aquarium Lighting | Fluval

Dan

Bump: Is this the 3991 or 3992 we are talking about? Both will work for 48"

Dan
The OP says that their light (actual fixture) is 48", so probably the A3992. If so, that is probably enough light with one fixture.

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post #15 of 27 (permalink) Old 05-30-2017, 06:02 PM
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Hi Dan,

I took my readings in a 20 high and because there was driftwood and tall crypts in the middle the only clear area of the substrate was in the middle closer to the front of the tank; it is likely that light reflecting off of the glass impacted the PAR reading. On my 30 gallon long I was able to take a reading in the middle of that tank and at 12" depth to substrate I got [email protected] @ max output with no glass top.....still high light. PAR reading can be effected by the type of sensor used, as well as whether the readings are taken underwater or in 'free-air'. If underwater, then you deal with water clarity issues, surface agitation, and sometimes even fish swimming by (sometimes they are curious - lol). It is likely that SKY-HIGH should have sufficient light to grow most plant species with that light and depth.
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