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Old 07-08-2013, 11:22 PM   #71
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I'm using straight blue LEDs over various corals right now, and they are all doing very well and are quite colorful. I don't have anything blue in there though, but it's mainly because the only blue corals I have are acropora and I'm not running enough blues over this tank to support them. Maybe I'll lower the fixture and toss in something.
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Old 07-08-2013, 11:28 PM   #72
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Being curious of my own question, I searched and i found this link.
Small Polyp Stony Coral and Light Wavelengths - Are LEDs 'Reef Capable'? You decide.

This is a quote from that link

"Montipora caprricornus and Montipora digitata are of the same genus, but are two different species. These two corals do not grow at the same rate, when under the same photosynthetic wavelength of light. Each species requires a specific color wavelength (measured in nanometers) to obtain “optimal” color pigment of the coral’s tissue. "
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Old 07-08-2013, 11:41 PM   #73
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If that's the case, then it's safe to say that the units over my tank are not as limited in terms of wavelengths as we thought.
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Old 07-09-2013, 01:01 AM   #74
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Again, I think you can see it in terms of bandwidth. The spectrum narrows from blue to black the deeper you go. The corals algae evolve to absorb those frequencies, down to darkness where only filter feeders live and there is no photosynthesis. But why would a coral be blue if it was evolved to absorb blue light ? Because of variation, I can see how a coral might use whatever it can get to grow. And LEDs, even blue ones have a pretty wide bandwidth in the blue spectrum. They aren't like lasers which are very monochromatic. That was my big word for the evening. Thank you and good night. Zzzz

Another pretty good read;

http://www.reeffrontiers.com/content...ts-corals.html
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Old 07-09-2013, 02:05 PM   #75
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Very interesting to note that corals can absorb different wavelengths and create a distinct color for itself. IMO the pigmentation of each specie could be some sort of a defense mechanism for survival to repel other sea creatures from consuming it just like how octopus with a more sophisticated comouflage. The blue corals could be too sensitive for UVa or UVb but all we see is just blue. It must be absorbing other colors to tint itselft with blue.
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