DLI (daily lighting index)

Discussion in 'Equipment: Setup and Discussion' started by RSnodgrass, Sep 15, 2020.

  1. RSnodgrass

    RSnodgrass Don't be a stranger!
    BOD Lifetime Member Event Committee Meeting Host 2019 Meeting Host 2020

    Joined:
    Apr 7, 2007
    Messages:
    7,213
    Likes Received:
    1,520
    Location:
    Lynd, MN, United States
    I thought this video was interesting. Higher light lower duration = lower algae, also differences in growth.

     
    • Informative Informative x 2
  2. OP
    RSnodgrass

    RSnodgrass Don't be a stranger!
    BOD Lifetime Member Event Committee Meeting Host 2019 Meeting Host 2020

    Joined:
    Apr 7, 2007
    Messages:
    7,213
    Likes Received:
    1,520
    Location:
    Lynd, MN, United States
    Not confirmed but a comment said 12hrs 300par at 12" vs 8hrs 450par at 12".
     
  3. Ben Nicholls

    Ben Nicholls TCMAS Old Timer
    Lifetime Member Meeting Host 2019

    Joined:
    Feb 22, 2007
    Messages:
    1,588
    Likes Received:
    347
    Location:
    Apple Valley, MN, USA
    Interesting about the monti cap growing differently according to intensity.
     
  4. OP
    RSnodgrass

    RSnodgrass Don't be a stranger!
    BOD Lifetime Member Event Committee Meeting Host 2019 Meeting Host 2020

    Joined:
    Apr 7, 2007
    Messages:
    7,213
    Likes Received:
    1,520
    Location:
    Lynd, MN, United States
    The only thing I would say is I think in these systems they are not accounting for where coral are getting their nutrients from. It seems they assume it's the lights and lights clearly impacted the shape corals grew in.

    That being said there was a photosynthetic study done on coral in the wild and they largely stopped the photosynthetic process above 200par. Assuming that the really expensive equipment to test this covered a large enough scope then the par in these tests is only helpful in color and shape, not actual growth mass.
     
  5. jlanger

    jlanger "The North Remembers"
    Lifetime Member Event Committee

    Joined:
    May 8, 2010
    Messages:
    5,012
    Likes Received:
    1,512
    Location:
    New Richmond, WI
    Does it matter though since the systems are running on the same filtration system/sump?
    If they were comparing the growth rates of corals that were in different systems, there would be an argument for sure.

    The one comment that caught my attention was that the bubble algae was not present in the system with higher lighting. I've read that a method to battle bubble algae is to lower the lighting on the display tank. I guess I'll know for sure as I lowered my lighting intensity just over a week ago in hopes of seeing an improvement in that department.

    And as far as the growth forms in the montipora capricornus corals, I witnessed that years ago.
     
  6. OP
    RSnodgrass

    RSnodgrass Don't be a stranger!
    BOD Lifetime Member Event Committee Meeting Host 2019 Meeting Host 2020

    Joined:
    Apr 7, 2007
    Messages:
    7,213
    Likes Received:
    1,520
    Location:
    Lynd, MN, United States
    What I should have clarified is that the the two lighting choices appear to have ruled out growth rate advantages when maintaining the same DLI and being on the same system was necessary.
     

Share This Page