Marineland double bright 18" - 24" LED light review

DaveinSF

AC Members
Apr 12, 2005
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Hi All,

I recently got a Marineland 18" -24" double bright LED light for a standard 10 gallon 20" wide freshwater tank. The tank is populated as follows:

1. one golden loach, about 4" long
2. two small, slender black loaches, around 3" long each
3. three bandit corys
4. 5-6 otocinclus catfish

This is a mature, planted tank with 2-3" of fine sand substrate. The plants consist mainly of large, mature amazon swords, an anubias, java moss, and other low light freshwater plants.

So far the new Marineland LED is holding its own on a timer and is on about 9 hours a day. I wouldn't say that the plants are growing better than before, but they aren't dying either.

Even though this is the "double bright" LED fixture with 450 lumens of light output, I would have to say that it doesn't seem as subjectively bright as the single 18" 15 watt T8 type grow bulb that it replaced. I'd say that the quality of the light for fish viewing is a bit better, however, being less harsh and surprisingly evenly dispersed, despite the fact that the LEDs are arrayed in rows and emit light straight down into the tank. The light fixture itself is very low profile and sleek and makes the entire tank itself seem a lot less bulky.

Assuming it holds up well, I would probably get one again, though I wonder if Marineland's new "reef capable" or 'aquatic plant lighting system' light fixtures would work better for planted tanks:
http://www.marineland.com/MLCatalog.aspx?taxid=1912149

Has anyone been able to compare any of these lights?
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Marineland website gives a PAR rating @ 12" of 30, which seems sufficient for low light plants.
 
Since a "typical" 18" 15Watt T8 probably puts out about 845 lumens give or take. So the led fixture is a good bit "dimmer" at least from a lumen standpoint. Par-wise is hard to judge without measuring the actual fixture you were using, but I would expect a standard plastic T8 to give you between 30-40 micromols at 12inches. Keep us posted on how the plants do over time.
 
Lumens and LUX are a measurement used for comparisons for human eyes, not plants. While sufficient quantity of any visible light will grow plants PAR is the only measure that allows direct comparisons for aquatic plant use.
 
Right. That's why I went and found the PAR rating for this light fixture. Looking at the chart, it looks like it may be lacking in the red part of the spectrum, however.
 
Like I said in the earlier post, PAR is rated as 30 @ 12". I got mine at Amazon.com.
 
when I tested this unit, I found it did not have sufficient red spectrum for plants. My red plants suffered first, but none did well over the test.

Hey, thanks for the input. I tried bumping up the amount of time it is on during the day with the timer to see if it helps.

I've had my double bright fixture for about a month now and plant growth does seem to have slowed a bit. Also, dark brush algae that had developed on some of the larger, more mature leaves has not gone away. Java moss growth has also slowed noticeably.

I have a feeling that this light may be just barely adequate for my current setup. I don't want to go with the reef or newer LEDs with MUCH higher output, however, as I am concerned about algae growth. I want to try Marineland's red LED accent lighting in combination with this light, as I hope it might be enough to do the trick.
 
Although it isn't working well for you, thank you for taking the time to review it.
 
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