how much light for emersed plants

Discussion in 'Emersed Aquatic Plants' started by Pierre07, Apr 9, 2013.

  1. Pierre07
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    Pierre07 Green fingers

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    I'm looking in setting up a little hidroponic setup for emersed growth. The system I'm looking to use is a flood and drain system with rockwool as the medium. Having some enclosure above over the plants to keep humidity up. Been doing allot of reading and can't find a good answer. I decided on using t8 tubes and looking the grolux way with some decent reflectors. Because it's a emersed setup the look of the lights don't bother me. Looking for good steady growth not looks. Now for the question w/m2? :scratch: lights will be about 400 to 450 from the substrate with a class sheet under the lights.
     
  2. Slagter
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    Slagter Aquascaper

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    I have 2 x 54 watt t5s for you if you want? You'll just need reflectors.
     
  3. Pierre07
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    Pierre07 Green fingers

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    That cool thanks Sean. Now the million dollar question how much will postage be and will it be worth two tubes :scratch:
     
  4. Slagter
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    Slagter Aquascaper

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    2 tubes plus ballast, all wired? Not sure.
     
  5. Greystoke
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    Flood & drain is an effective system, although I used gravel instead of rockwool (rockwool makes an awful mess).

    I'll be watching this space ;D
     
  6. Pierre07
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    Pierre07 Green fingers

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    I looked at different substrates and it seems the rockwool is most effective :scratch: yes the only drawback will be the mess for getting out the plants when you would like to use them. I like the rockwool for it's water holding capacity and at the same time allowing enough [acronym=Oxygen gas]O2[/acronym] for the roots to be healthy. Apparently rockwool holds at least 18% [acronym=Oxygen gas]O2[/acronym] at all time unless fuller submerged in water. The other thing I like about the rockwool is that you can alter the [acronym=measure of acidity or alkalinity]pH[/acronym] value in it very easily by conditioning the rockwool before planting. So having a [acronym=measure of acidity or alkalinity]pH[/acronym] between 6 and 7 in the substrate seems to be easy enough.
    The only thing I am still not sure about is how much light would be enough to grow plants at a good rate without wasting energy. W/m2 using say grolux tubes that puts out more red and blue than yellow and green. :scratch:
     
  7. Pierre07
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    Pierre07 Green fingers

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    If it works out to much for courier costs so that it is not worth the effort then rather offer it to someone closer by that can collect. But if it's worth the courier cost I will gladly take it off your hands. Thanks again for the offer Sean :notworthy:
     
  8. Greystoke
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    Thanks for the reply Pierre,

    I've got my emersed set-up under full sun for about 3 hrs/day in the morning, after which it will be shaded.
    Of course, growing emersed, the plants have excess to all the CO[sub]2[/sub] in the world ;D , meaning that nutrients (your hydroponic system) and CO[sub]2[/sub] are not a problem, but lights might be.
    I would suggest (guess work :scratch:) to start at about 250W/m ² and see what happens.
     
  9. Pierre07
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    Pierre07 Green fingers

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    Thanks for the advise Cor
    Currently I'm running a emersed setup in a 1.2 tank. Substrate a concoction of potting soil, bonsai mix, microbe lift plant substrate, bonemeal, slow release fertilizers and some rusting nails. Lighting at 230w/m2. A mix of 6500k and 4000k cfl mounted in standard square pvc gutter. Very easy little units to build and cost effective by the way. Planted this tank tomorrow two weeks ago and some plants has grown up to 8cm in there others less. Still transitioning from submerged to emersed. But if say 300w/m2 will improve things more it's worth the effort. So is there a point of overkill that I would have to much light in your opinion putting the risk of getting algae and mold in the high humid conditions with lots of light aside :icon_study: :scratch: :icon_study: :scratch: :scratch: :BangHead:
     
  10. Greystoke
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    Greystoke Specialist

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    I think you have the right idea, and I like it, but when you go Flood & Drain, tell me your dosing please.

    Please let me know what's happening. I'm very interested.
     
  11. Pierre07
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    Pierre07 Green fingers

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    Thanks cor will let you know. Ferts I will be doing some trial and error. Looking to use normal hydroponic ferts solution at first. My thinking behind this is if aquatic plants can grow in potting soil concoctions with normal nursery ferts. They should grow in hydroponic ferts as well and at a fraction of the price of aquarium ferts. In the end they are also only plants and would use basically any nutrients available to them in my lack of knowledge opinion :evil6:
    Surely in nature there is a abundance of nutrients to most aquatic plants and not made by Tropica, ADA or seachem :evil6: P.S. not suggesting to anyone to go throw hydroponic ferts in there aquariums please stick to ADA, tropica or seachem products. For my application it mite or mite not work. Only experimenting would tell in the end [​IMG]
     
  12. Puntius
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    Puntius Green fingers

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    @Pierre07 This setup sounds freaking cool man, post some pics for us.
     

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