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Max PAR without CO2

Discussion in 'Lighting' started by Yo-han, Apr 8, 2013.

  1. Yo-han

    Yo-han Guru Class Expert

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    I installed a dimmer on my T5 a few weeks ago and arranged a PAR meter. I can get over 320 at the surface and 170 at the substrate in the front. But at how much PAR do you start CO2?
     
  2. dutchy

    dutchy Plant Guru Team
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    I've never been able to keep a non CO2 tank in shape with more than 30 mmols of PAR at the substrate. With Excel until 40 mmols.

    Everything higher means CO2 to me.
     
  3. Yo-han

    Yo-han Guru Class Expert

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    Thanks, so you would start CO2 before it hits 30 at the substrate, or would you make sure it is at his peak at 30?
     
  4. dutchy

    dutchy Plant Guru Team
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    I'd keep it at 30, with less some plants could get problems to grow.
     
  5. Yo-han

    Yo-han Guru Class Expert

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    I think you misunderstood. I'm using CO2, and will be using higher light anyway. But before, I could only switch the bulbs on per two. Now I'm using a flora-mate dimmer, so the question was when to turn the CO2 on. Right from the start, when the bulbs kick on at 1%, or from a certain PAR. But I'll make sure my CO2 is high when PAR hits 30.
     
  6. dutchy

    dutchy Plant Guru Team
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    Yes I misunderstood :eek: Some will photosynthesize at a very low PAR, even down to 12 mmols. So it's better if you start CO2 even before the first bit of light switches on.
     
  7. Marcel G

    Marcel G Banned

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    I agree with dutchy. Some mosses are able to grow at 6-12 mmol PAR. I also saw some weeds (egeria densa?) to survive at 5 mmol PAR, although it seemed impossible. Anubias also can survive at these levels.
     
  8. Tom Barr

    Tom Barr Founder
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    I would start as soon as the lights come on, as the light increases, so does the CO2.
    Then turn off the CO2 about 30 minutes before the lights go off at night.
     
  9. Yo-han

    Yo-han Guru Class Expert

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    Thanks all! Experimenting again;)
     
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