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Lighting Spectrum To Target Plant Quality Vs Plant Mass Yield

Discussion in 'Lighting' started by Justin gililland, Sep 6, 2018.

  1. Justin gililland

    Justin gililland New Member

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    Not sure if I'm doing this right I couldnt figure out how to create a post but I found this article starting so here we go..
    However a highly contevertial topic among the hobby ive only found arguments and general evidence here and there about lighting specteums and plant growth. Theres lots out there pointing toward a full spectrum/white light range for the best visual colors and growth rate. However im in the hobby not only because i enjoy it but also as a means to further expand my knowledge every day.

    What i have been researching and testing is the benefits of lighting that targets the most common light absorption wavelengths in the uv and visible spectrum to promote pigment production, protien synthesis, amino synthesis etc. Rather than growing plants very fast. I've compiled a list of the most common pigments found in plants and the light wavelengths they absorb at the peaks thus insuring an efficiency factor minimizing waste light resulting in less chance of algae production and more par being used vs energy used to produce it, ie if using 100 par at substrate of full spectrum the absorption range is very little of the total projected wavelength rather than reflected then 100 par of an absorption focused wavelength should mean more light being absorbed/used by any given plant.

    Now let's not get too hung up or upset when I say light absorbed is light used bc it simply is, it may not be used for photosynthesis but it certainly is used in many biosynthetic pathways as well as heat transfer further driving biosynthesis. Furthermore plants are very efficient in this realm by using absorbed energy for photosynthesis even though the chloroplasts arent directly absorbing the photons. Many say this is pointless but if you think about it if you're really an aquatic plant enthusiast then why would trying to improve certain aspects and health values of the plant be pointless?

    I'm sure I've forgotten some but I will post some photos of my test tank which is a 20 long(innovative marine peninsula), ph is 5.8-6 with co2 injection(havnt tested offgas in a while so idk the specific drop), we need to test alkalinity and hardness as it's been a while for that aswell lol... but as far as controls the tank is dosed thrive + via an autodoser 3x a day (8am,10am,12pm), lighting is an oddysea quad t5ho with hortilux 420,460,633,660 bulbs 420,633 8am-2pm 460,660 10am-4pm and a sunblaster woth an agromax pure uv for uvb supplementation from 12pm-2pm I believe, water changes use pure ro water no remineralizing roughly 50% in january I will be adding another auto dosing pump for a 5% nightly auto waterchange ome waste line one ro line.
     
    #1 Justin gililland, Sep 6, 2018
    Last edited: Sep 7, 2018
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  2. burr740

    burr740 ~~ Lover of Micros ~~
    Staff Member Moderator

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    Interesting topic.

    Ive moved this to the proper forum instead of being an article

    Images you either have to host them somewhere and put them between [ img] link [ /img] tags, or use the site's upload feature

    May I suggest putting all the images you want to use for the thread in a single folder on your computer before you begin to make it easier.

    Also I would suggest breaking the OP up into paragraphs to make it easier to read.

    Like anything worthwhile, it does require a certain degree of effort on your part. :)
     
    Mike k, Justin gililland and Greggz like this.
  3. Justin gililland

    Justin gililland New Member

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    Yessir lol I'll try to fix it
     
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  4. Phishless

    Phishless Lifetime Member
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    Back to the title of your topic.

    I've never tried to get a large yield from plant growth.
    With some species it is next to impossible to limit their growth though.

    Premium growth I have always targeted.
    Have experimented with several different DIY LED arrangements over the past years.

    UV within LED technology is not a win unless big $$$ are spent.

    If any are interested I am blending several LED's on my pucks.
    15K white, 460nm, 520nm, and the weed growers favorite full spectrum types.
    The full spectrums range from 380nm - 780nm.
     
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  5. Justin gililland

    Justin gililland New Member

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    Heres a few pics of the test tank. Were still getting it where we want it and trying a different carpet species, added 5 stems of s. Kerala to see if I prefer its growth rate and pattern over the s. Repens I've grown bored of I may end up carpeting with various buce sp. If I dont like it for this tank. The first pic is the most recent from this morning the rest are over the last couple weeks...
    Observations so far are much slower growth and nutrient uptake hinting the plant is morphing to a survival state focusing on quality of cells rather than production of cells, pigment saturation to help aid with the high par and uvb, heavier rooting.
    Edit: attached my current combined spectrograph of the 4 hortilux bulbs I'm utilizing and a spectrograph for the agromax pure uv for uvb supplementation

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    #5 Justin gililland, Sep 7, 2018
    Last edited: Sep 8, 2018
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  6. Phishless

    Phishless Lifetime Member
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    This is why I blend 1 full spectrum to 1 15K.
    No pink and purple effects.
     
  7. Justin gililland

    Justin gililland New Member

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    Yeah that is a downside but in a few months once the tank is where I want it we will add a 7500k bulb in place of the uv bulb and turn off the rest of the lights for a better full spectrum comparison. Also the way I have a ramp effect on the 420 and 633 come on first for heavy blue with orange/red supplemental lighting then overlapping and finishing with 460 and 660 for heavy red with blue/green supplemental lighting the uvb is a strongbulb which I havnt measured par increase yet with it on but it is run 2 hrs midday for a bit extra oomph.. I probably should have redone my carpet before starting this so disregard any old growth you see lol it was that way when we started
     
    #7 Justin gililland, Sep 7, 2018
    Last edited: Sep 8, 2018
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  8. Justin gililland

    Justin gililland New Member

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    Heres the spectrum list I'm trying to target for pigment absorption however so mainly going for the 400-500(some up to 520) and 620-680 peaks I did find a bulb after the fact that's close to what I want but it does have a significant green peak

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  9. Justin gililland

    Justin gililland New Member

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    Heres a pic in my 40 breeder. The lud. super red up front was transplanted from the 20 long note the color and size difference between it and the super red behind it. Heres a crappy top angle the deeper purple/red is from the 20 long.. also note the shiney texture I assume this is oils secreted from the plant caused by the uvb.
    Another odd note is that I'm dosing near 50ppm weekly with <5ppm no3 and <.25ppm po4 and getting fairly slow growth due to lighting... I'll attach a rotala butterfly of the daily dose... all followed by some current growth/colorations. The last photo was darkened slightly

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    #9 Justin gililland, Sep 11, 2018
    Last edited: Sep 12, 2018
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