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Old 05-13-2012, 10:56 PM   #31
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http://aquariumdigest.wordpress.com/...ghts-lighting/

There's more to the LEDs than I had realized. And after speaking to one of my subcontractors today, who is an electrical engineer/designer, he said there is more detail than is let on with regards to LEDs. You get what you pay for and you still need to do the research for "your" tank.
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Old 05-13-2012, 11:08 PM   #32
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That must be some outdated information. They mention only 1 Taotronics fixture which has 220 one watt LEDs. The ones I am using are 55 three watt LEDs pushed to 2 watts a piece. I have done months of research on these as they are growing SPS in my tank that's 30" away from the fixture.
I don't know (no one does, unless they buy a 3 thousand dollar meter) the PUR output, but the PAR numbers easily match a 250 watt metal halide.
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Old 05-13-2012, 11:11 PM   #33
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Quote:
Originally Posted by mr_X
That must be some outdated information. They mention only 1 Taotronics fixture which has 220 one watt LEDs. The ones I am using are 55 three watt LEDs pushed to 2 watts a piece. I have done months of research on these as they are growing SPS in my tank that's 30" away from the fixture.
I don't know (no one does, unless they buy a 3 thousand dollar meter) the PUR output, but the PAR numbers easily match a 250 watt metal halide.
Didn't you actually post the PAR results in a thread?
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Old 05-13-2012, 11:13 PM   #34
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I think my build thread has them, but that was the 31" tank. Not my new tank. The PAR on the sand bed in this tank (25" deep) is around 220.
My only complaint is that I didn't get the dimmable fixtures so I could turn them down a bit.
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Old 05-14-2012, 12:32 AM   #35
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Here's a professional review of the 55 x 3w Taotronics fixture dated 3/2/12.

Your stating that no one knows the PUR....direct from the article

" Finally it is important to note that even if this were a reef capable LED fixture, the proportion of Daylight to blue is incorrect for most common aquarium depth requires, so poor PUR is going to be the result! "

It is important to note that an LED (or any light) can test well for PAR using a PAR meter, but still have poor “Useful Light Energy” (PUR)
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Old 05-14-2012, 08:21 AM   #36
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Quoting someone from "my aquarium opinions" hardly convinces me of a professional review.
That statement is nonsense btw. The writer doesn't know the PUR output of the fixture, or he would have listed it. It's a guess. The amount of white and blue is of no importance when considering intensity. You should know that quote "the proportion of Daylight to blue is incorrect for most common aquarium depth requires" to be false, due to the countless tanks that use 20k halides over 24" deep tanks. 20,000k is certainly too blue for 24" of water, but the corals don't even know it. It's for your viewing pleasure only.

"I will admit that I have not personally used the TaoTronic LED"

No PUR meter used here.

The proof is on the sand bed, where my amateur eyes witness SPS getting great growth and coloration. As a matter of fact, these fixtures I have are so weak, I just raised 2 of them up another 6" so I could stop bleaching my LPS.
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Old 05-14-2012, 09:04 AM   #37
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The author of that piece has been involved in professional aquarium maintenance since 1987 in Southern California.

The web page mission statement: I will address these subjects in upcoming posts based on my experience, those in the industry that I know have true knowledge of said products, and based factual research of said products.

http://aap.atrixnet.com/?p=338

Maybe this article will clear it up....from the article above

If you are still considering one of these LED knock-offs (that use “off the shelf emitters&rdquo, realize the most important light measurement is “Useful Light Energy” or PUR and although most lighting professionals recommend the use of PAR Meters as a measurement of any aquarium lighting fixture, in the end this is still not 100% accurate, especially when one compares the best emitter bins to many of the older emitter bins used by the cheaper Chinese or similar LED light fixtures. Often the “cheap” LEDs produce considerably more useless green/yellow light and are bottom heavy in the Blue Spectrum. It is also noteworthy that a couple of these low price LED makers from China are also using stolen technology emitters and pending lawsuits will likely result in these manufacturers not being around long term for any real customer support.

The purpose of this Aquarium Supplies & Resources is to provide Resources for top notch/researched Aquarium Information.
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Old 05-14-2012, 09:19 AM   #38
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Many people have been keeping tanks for 10 years or even 20. It doesn't mean they know anything more than anyone else. The technology 20 years ago is not even used today so that knowledge is worthless here. This guy knows less than me, since all he has to go by is hearsay. What state he lives in is irrelevant.
As for the second article- How do we know these aren't the "stolen" technology and not the weaker technology?
Obviously, the author doesn't know.

Are you missing my comment about being able to grow SPS on the sand bed?
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Old 05-14-2012, 09:29 AM   #39
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Quote:
Originally Posted by mr_X
Many people have been keeping tanks for 10 years or even 20. It doesn't mean they know anything more than anyone else. The technology 20 years ago is not even used today so that knowledge is worthless here. This guy knows less than me, since all he has to go by is hearsay. What state he lives in is irrelevant.
As for the second article- How do we know these aren't the "stolen" technology and not the weaker technology?
Obviously, the author doesn't know.

Are you missing my comment about being able to grow SPS on the sand bed?
Well I trust your "amateur" eye and I'm buying the ones you recommended... Lol... Thanks for the help, Doug.
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Old 05-14-2012, 09:35 AM   #40
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I am in no way saying these are the same as the ones that cost a thousand dollars, but I'm saying that you can definitely keep a reef tank under these and nothing in the tank is going to lack. Go ahead and purchase the Audi if you want. I'm sticking with my VW Golf for now.
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