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Best Light Spectrum for Coral Growth

Light influences the response to photosynthesis, the rate of calcification and also plays a role in the reproductive cycle.

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the rate of photosynthesis and light acceptance by creating ..

2- At the depths most of these corals are collected at, isn't it really blue down there? Not to sound stupid, but the red and yellow wavelengths of light don't penetrate more than a few meters of saltwater, right... so the photosynthetic organisms are used to seeing and living in blue light, they are "adapted" to that environ. I make an analogy to where I work at a Printing Company... Our Printing Plates are light sensitive, so we have to put special yellow colored lights in everywhere in the plate room. After a 12 hour shift of fumbling around with the my Creo in there... you get used to the yellow lights. You start to perceive color's normally under the yellow illumination (your brain tells you what color you're supposed to see, it compensates for the light source). You get adapted to the environ. Over time, you will lose some color perception as your cones become adapted to viewing in those conditions. This can be observed when you go into a room with bright white lights. I'm no longer able to make color judgements on press, unless I've been out under their lights for at least 30 minutes.

Though frost hardiness is unknown these are suspected to be somewhat warm-blooded, USDA zone 9ish.

Yes, I see what you're getting at, and yes, this is an important distinction, and on a certain level, I can agree with the above statement. The purpose of our extravagant and expensive lighting systems is to provide energy for the photosynthetic critters in our care... To that I agree, and if you've got natural sunlight and an incandescent bulb and that fully meets your critter's requirements, actinic lighting would provide no greater benefit other than for the observer.

they require light for photosynthesis to ..

As light passes through the water column, it is attenuated exponentially, and this attenuation is not uniform across all wavelengths.

Now, if we want to talk about relative usefullness of various spectra and how the PCP complex and various types (not strains) of chlorphyll react in accordance with saturating and subsaturating light of various wavelenghts, we can. We will also see that white and blue light are MOST beneficial to stimulating zooxanthellae and providing corals with energy. Neat thing about actinics, on top of that, if their use in stimulating fluorescing proteins in corals, and this can be very important especially in low-light environments when UV and blue may be the only light waves to reach them.

Going to the other end of the scale, plants need a minimum amount of light to even start photosynthesising. For any where near decent plant growth we really want to be giving somewhere in the region of 100 – 200 umol/m2/s

Effect of light quality on photosynthesis of ..

The term  (PUR) has been defined as a means to quantify the capability of a cell to use the light available for photosynthesis.

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The rate at which photosynthesis occurs is dependent on the quality and quantity of light, density of zooxanthellae, composition of pigments, temperature and CO availability.

This measure of the amount of light that is frequently used is called  (PAR), which I will discuss later when covering photosynthesis.
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  • source of light of the right spectrum for photosynthesis to ..

    Conversion between the two is possible, but requires knowledge of the spectral distribution of the light.

  • corals can utilize a lot of the light spectrum, ..

    The term PAR refers to the amount of light that falls in the range that is suitable for photosynthesis.

  • Photosynthetic Efficiencies of LEDs: Results of Short …

    to supply a light of 400 to 500 nm range to promote fluorescence and the marine photosynthesis in the tank

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Acan Coral Care , placement, sale, feeding, colors and fragging

As the chlorpophyll cells capture the energy from the photon, they basically steal some energy off an electron, and then let the light be on it's way. They use that energy to bond carbon and water or something, forming simple sugars, and pow, we've got photosynthesis. Higher energy wavelengths of light (e.g. Actinic spectrum), carry higher energy electrons, and the chlorpophyll is able to utilize a single electron multiple times to create it's sugars... It's like the energy cycle carried out in the mitochondria in our cells creating ATP, only in reverse (literally, almost identical to a ). You'll have to forgive that horrid description, but it's been a few years since I studied any of this, and I've smoked a lot of dope in that time...

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The most often used ways for us humans to measure the amount or brightness of light is in lumens or foot-candles. The measurements of lumens or foot-candles take into account the whole light spectrum that humans can see. i.e. from about 390nm to about 700nm, but our human eyes are far more sensitive to green light than light at the ends of the visible spectrum (red and blue): Here is the sensitivity of our eyes over the visible spectrum:

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So, in previous articles we have taken a look at what light is, and what colours (wavelengths) plants use and therefore need. Progressing on from that, in this blog we will talk about how we can measure the amount of light we are giving our plants, how much light we need to give them, and how we can judge what area we can expect a grow light to illuminate and effectively grow plants in.

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My POV stems from this concept (flawed as it's recollection may be... there never is a good biologist around when you need one?), and that in terrestrial plants, chlorophyll is able to use the increased energy contained in higher energy light. What I believe is that Zooanthelea are closely enough related to chlorophyll, that I believe they too may be able to make better use of higher energy lighting... e.g. actinics. So you can see why I say it's more than just aesthetics... I believe that the photosynthesis can be carried out at greater efficiencies using higher energy wavelengths of light, than using lower energy wavelengths. Of course I can't prove it... but I got some good theories kicking around in my head. There are two other things that keep gnawing away at this in the back of my head, and ironically enough it goes back to the terrestrial plants studied in my biology class...

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