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LEDs have proven themselves in hydroponic growing conditions, and have reduced the costs for greenhouse operations where they have been used. So, from the perspective of plants, they are a good thing. The one variable I have not been able to find out if it will impact the use of LED grow lights in an aquarium environment is the water itself. Because of the water, you can't put the lights as close to the plants as they have done in the university experiments. (sometimes as close as 3 inches) I couldn't find any info that addressed whether or not the water acted as a filter and reduced the effectiveness of the lights.

I do have to say that I question the quality of the product in the link. I can't find a single provider of LED grow lights that has a price anywhere close to that. I found a kit on another website, very similar to the one you found assembled, the KIT was $40. Caveat Emptor (let the buyer beware)

http://www.squidoo.com/led_growlights
 

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I found a site that lists a number of North American based LED grow light suppliers with links to their sites so you can compare what I have said for yourself. If you were comparing cars that seemed to have the same features and one was 1/4 the price of the others, you would have to wonder why.

http://www.ledgrowlights.info/buy-LED-USA.php
 

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OK, last reply, I promise.

http://www.greenpinelane.com/

This guy does comparisons of the more well known manufacturers of LED grow lights. His results verify that there is a huge difference between the different lights. The reputable manufacturers have put time, money and research into the spectrum of the LEDs they use, and have tested the results. I am not saying you need to go out and buy a $649 SuperLED Lightblaze 400, but I am saying that the more I read about grow lights it seems you get what you pay for.
 
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