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Old 05-13-2013, 02:23 PM   #841
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Not recommended for coral growth. Look onto Taotronics or Rapid LED.
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Old 05-13-2013, 02:42 PM   #842
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I'm looking into the taotronics on eBay, the dimmable ones. Since I have a 4ft tank I need 2 units. Was just looking to cut corners price wise with the similar specs and just wanted to clarify that. I have my tank against the wall in my bedroom. Half the tank is in front of my closet door and the other half is in front of the wall. I was planning on hanging them from the wall but can't because of this reason.
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Old 05-13-2013, 03:00 PM   #843
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So someone in my area is selling a 48" reef marineland led system but from the info he provided to me it seems to be only 8 blues and like 48 whites only 1w leds a little over 3000 lumens. Why is this listed as reef capable? If its not 3w LEDs? Or is this ok?
Most first generation aquarium LEDs produced about 70 lumen per watt. Modern and more efficient LEDs are now exceeding 130-150 lumen per watt (Cree). Bridgelux are good too, but Cree are better. These Marineland are about 53 lumen per watt. Crap.
Lumen is a measurement of total light transmitted, while PAR is measuring the light in the Photosynthetic range only (a better measurement).

Final thing on light, it doesn't matter ANYTHING about how many point sources you have for the light. That is to say, if you have 3 x 1 watt LEDs that have the same efficiency as 1 x 3 watt LED which then produce the same amount of PAR at the combined source, they will have IDENTICAL, SAME, MATCHING, EQUAL light penetration at 24" under water. Anybody who says anything different does not know anything about light transmission.
That being said, most 3 watt LEDs are more efficient than 1 watt LEDs.

I only bring this up because every now and then someone makes the incorrect statement that comparable 3 watt LEDs will penetrate better than 3 1 Watt LEDs, as if light were a bullet. WRONG!!!
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Old 05-13-2013, 03:08 PM   #844
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Glad you pointed that out Ingy.. I assumed what you just said was the correct answer but was never sure.
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Old 05-13-2013, 04:09 PM   #845
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That is a true statement, but point sources create more shadows and mix the light not as well. For example I have panels rated at 120 watts that have 60 blue and white emitters and some panels that have fewer higher power emitters to make the same amount of light. Depending on the lenses, you can have a situation where you have blue edged shadows. More emitters allows for better color mixing. But that's the only advantage.
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Old 05-14-2013, 12:05 AM   #846
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Comparison of LEDs must be of same colors and not combination of whites and blues. Lights are photons and considering same wattage and efficiency they should have equal intensity or PAR regardless of the number of emitters. The old rule for aquarium light is even measured in watts per gallon. Meaning you can put several combination of bulbs as long as you satisfy the rule. In addition all lights travel at the same speed. In simple term the intensity is cumulative.
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Old 05-14-2013, 12:15 AM   #847
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So someone in my area is selling a 48" reef marineland led system but from the info he provided to me it seems to be only 8 blues and like 48 whites only 1w leds a little over 3000 lumens. Why is this listed as reef capable? If its not 3w LEDs? Or is this ok?
This light is good just for soft corals only that is why they emphasize "reef capable". Now if you have 3 of this, you can grow sps and lps. The only problem is that the fixture and power supply over heats aside from being expensive. The only thing I like about it is the timer cause you can set the blue and white separately.
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Old 05-14-2013, 03:42 PM   #848
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Why with the taotronics do you need 2 units for a 4ft tank? Is there anyway to get away with 1 unit centered?
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Old 05-14-2013, 03:51 PM   #849
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Why with the taotronics do you need 2 units for a 4ft tank? Is there anyway to get away with 1 unit centered?
You might be ok w/ 1 light, but you'll likely get some fall off at the edges. Try it with one and see how it works. I've got it centered over my 40b (36"s wide). I don't know if there would be that much fall off 6"s either way. I think the idea of 2 units over the 4 feet is for consistent lighting.
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Old 05-14-2013, 04:07 PM   #850
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You might be ok w/ 1 light, but you'll likely get some fall off at the edges. Try it with one and see how it works. I've got it centered over my 40b (36"s wide). I don't know if there would be that much fall off 6"s either way. I think the idea of 2 units over the 4 feet is for consistent lighting.
Thanks for that. I may have to go with 1 for now at least see how it looks than I can always add a second.
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