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Question about lighting

Discussion in 'Non-CO2 Methods' started by mexicatz, Sep 1, 2017.

  1. mexicatz

    mexicatz Junior Poster

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    I received the par data from finnex for my planted plus at 13 inches which came in at 62 par. I use a piece of window screen to cut the par by about 40% based on others testing. This puts my par at about 37 at the substrate.

    Some of the plants that I have in the 37 par are starting to grow algae while plants in the shade show no deficiencies or algae. I was wondering if it would be better to add another screen to cut the par to about 23 or if increasing my excel dosage to 1.5-2x would solve the problem. 37 par seems pretty close to the safe range to avoid algae with low light so I'm not sure.
     
  2. Phishless

    Phishless Lifetime Member
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    How long is the photoperiod?

    Cutting PAR in a low light tank will reduce algae.
    Is raising the light an option?
    Glut/excel is a decent algaecide too.

    Ever considered adding CO2?
     
  3. mexicatz

    mexicatz Junior Poster

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    the photo period is 6-6 1/2 hours and right now i've added the second piece of window screen so I think the par is around 22.
    I've looked at some led raisers that raise the light 3,4, or 6 inches but the par would be very close to what I can achieve with the window screen.

    Do you think I should stay at the 22? or should I try 37 with 1.5-2x excel dosing

    I've considered co2, but it probably wouldn't be a realistic option while I live with my parents.
     
  4. Jason King

    Jason King barrreport.com
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    I've always used Hoppy's ( @VaughnH ) reference for par values and if we need co2 based on that par.. low, medium, high light.

    Here is a quote from Hoppy.

    Off topic but it would be great if he wrote a updated version of his great lighting article here on the Barr report ;) hint hint :D
     
    snarkingturtle likes this.
  5. VaughnH

    VaughnH Lifetime Charter Member
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    I suggest considering this set-up/method: http://www.aquaticplantcentral.com/forumapc/general-aquarium-plants-discussions/133058-diy-co2.html

    No, I don't plan to update my lighting article in the near future. That was a lot of work, spread over a lot of weeks, and I don't collect lighting data for newer light fixtures now. I still think the basic facts in the article are correct, even if the charts of PAR for various types of lighting are obsolete.

    I'm now pushing the idea of borrowing a PAR meter to get a relatively accurate reading of the actual PAR you have at the substrate, with your specific lighting and set-up. To make that easier I am loaning out a PAR meter at a reasonable cost - shipping and insurance only. See: https://barrreport.com/threads/apogee-par-meter-for-rent.14334/
     
    Jason King, Christophe and burr740 like this.
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