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Old 03-17-2013, 02:48 PM   #16
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Very high light for 20 long


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Originally Posted by ThatGuyWithTheFish View Post
Well, can anyone give suggestions from experience, and not speculation? Because the last time I bought a fixture because someone told me it would be enough "PAR" I ended up with this...
From experience and research I can tell you the ray 2 is going to be way to high if you're not running co2 and dosing. Even a fugeray is probably going to be a lot but it'll be less


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Old 03-17-2013, 03:21 PM   #17
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Default Re: Very high light for 20 long

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Well, can anyone give suggestions from experience, and not speculation? Because the last time I bought a fixture because someone told me it would be enough "PAR" I ended up with this...
I thought it was because the two bulb was too expensive.

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Old 03-17-2013, 07:38 PM   #18
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I used to own a 20 L and I used an aquaticlife 2 bulb fixture. It was upper-high (not super high light) and brought out coloration in most reds if I used the legs it came with. I've never had a Ray II but that may be your next bet - or a 2 bulb catalina. All I know is you'll need a second bulb if you're sticking with T5. I'd recommend you try the aquaticlife for a bit and return it if you don't like it (they have a 30 day policy I think).
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Old 03-18-2013, 12:24 AM   #19
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Originally Posted by Yankee View Post
I used to own a 20 L and I used an aquaticlife 2 bulb fixture. It was upper-high (not super high light) and brought out coloration in most reds if I used the legs it came with. I've never had a Ray II but that may be your next bet - or a 2 bulb catalina. All I know is you'll need a second bulb if you're sticking with T5. I'd recommend you try the aquaticlife for a bit and return it if you don't like it (they have a 30 day policy I think).
LEDs don't grow red plants though. And those two are both over $100. :/
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Old 03-18-2013, 01:59 AM   #20
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Default Very high light for 20 long

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LEDs don't grow red plants though. And those two are both over $100. :/
Why not save up?


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Old 03-18-2013, 04:10 AM   #21
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Originally Posted by ThatGuyWithTheFish View Post
Well, can anyone give suggestions from experience, and not speculation? Because the last time I bought a fixture because someone told me it would be enough "PAR" I ended up with this...
I recently had my aquatic life t5HO fixture break. So rather than messing around with it, I decided to get a Finnex Ray 2 and I was stunned by how much more light this thing puts out. I am pretty sure you can find PAR data here:http://www.plantedtank.net/forums/sh...d.php?t=160396 Great light with high output. Its a little expensive but worth it.
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Old 03-19-2013, 03:03 AM   #22
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http://www.zooplus.com/shop/fish/tec..._lights/126353
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Old 03-19-2013, 08:29 AM   #23
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LEDs don't grow red plants though.
LED's grow red plants very well. PAR may go high enough that some people aren't dosing enough...otherwise, no clue where this misinformation arose.
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Old 05-12-2013, 01:18 AM   #24
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Forget about light intensity, concentrate on CO2 levels. Light levels grow algae without proper CO2 and flow.
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Old 05-12-2013, 04:41 AM   #25
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LEDs don't grow red plants though. And those two are both over $100. :/

LEDs can more than certainly grow colored plants. I had a DIY co2 and then a DIY led strip and all my plants really came to life I mean they look amazing
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Old 05-12-2013, 11:06 AM   #26
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Your fixture is plenty bright for a 20L. I would play with CO2 and ferts first before getting a double bulb fixture only to have to turn one of the bulbs off because of too much light.
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Old 05-12-2013, 02:30 PM   #27
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Your fixture is plenty bright for a 20L. I would play with CO2 and ferts first before getting a double bulb fixture only to have to turn one of the bulbs off because of too much light.
same statement i was about to make
a single bulb with a good reflector should give you plants that should be red, red


it will likely not stress response plants like ludwigia repens, or blyxa
but l. aromatica, r. macrandra. etc should be red with the right amount of co2 and a decent fert level
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Old 05-13-2013, 04:12 AM   #28
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I don't know where this current trope of 'LED's can't grow red plants' started, but it is both annoying to frequently correct and demonstrates a fundamental misunderstanding of what makes most plant leaves turn red. Sigh....
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Old 05-13-2013, 04:39 AM   #29
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I have been reading and reading upon LEDs lighting and currently in the middle of etching my PCB for my very own high powered 24V 5AMP LED light fixture. And I am sure LEDs can grow reds since the intensity of light differs from wave length. If you are really stuck on reading PAR, you should start to switch to reading LUX instead, since it will be a better scale for a 20L. The other thing is that with red plants, they will soak up green and blue lighting which will result in higher lighting - unlike green plants which intake blue and red lighting. (this will cause an increase in light taken by the red plants, yet reduce the light taken in by the green plants) along with different wavelengths, you could also increase the illumination duration for the plants - meaning leave the light on for a longer period.

Another thing that you could do is purchase a dual lighting tube. and insert your t5 and use a typical t8 for the other if you are going cheap. but since its a high tech tank why not just get a dual fixtures. kind of loss why a high tank would only be fixated with one tube.
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Old 05-13-2013, 05:20 AM   #30
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Default Re: Very high light for 20 long

I feel strange being on the other side of this 'conversation'...

IME, I see no reason why 99% of the available plants cannot be grown with a single t5ho bulb 2" above a 20L.

Instead of blindly dumping more $$ into a new fixture, you (and all of us) can benefit from figuring out what is going on.

I would start by taking a picture of the label on your t5ho bulb and posting it. That would give all of us a place to dance from. If the type/brand/temp/age/etc is not totally out of whack, then I would contact Catalina to find out if they, by any chance, installed the wrong ballast or cheappo reflector.

That aside, posting several pictures if the plants that you are not happy with, plus full tank shot with drop checker, would go miles to putting this thread to bed.

Telling what your lighting period is, you fertilization and other basic info would not hurt either.
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