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LED light calculation - my case and overall

Discussion in 'Lighting Requirements' started by RGBxLT, Aug 25, 2017.

  1. RGBxLT

    RGBxLT New Member

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    Hi All,

    so I am planning new tank: 150x40x50 cm, which makes it 300 l tank. My 150 and 40 cm are "locked" options, and height could be increased/decreased, but for me 50 cm seems to be right one.

    As all parts can more or less be selected and bought easily, lighting is difficult one. I don't want to spend huge amounts on best known products, and other cheaper LED solutions are not available in my location due big length.

    So only option I have - is DIY. I have friends with knowledge on tech side, so it should be fine. But first - I need to specify what I want.

    So question is - how many lumens in total I need for high-light requiring plants ("high-tech" tank) for my tank? I red many forums, and I am not quite got this answer.
    In one place I found that 40 lumens/l is requirement to consider it high-light. Then in this case, I would need about 12000 lumens of light for my 300 l tank. Which in my calculations usually falls on 120-130 W of LED.

    I know that lumens are not only measure :) the light i look for will be:
    ~6500K temp. - but i will mix it - most cold white, some neutral white, some blue.
    - color spectrum focused on blue and red waves.
    - PAR - that is difficult part, usually this information not provided. So the goal will be to place light as near to water as possible and to have dimmer to reduce/increase if needed.

    Sorry for long text :) many thoughts in one place :)

    Thanks.
     
  2. Culprit3

    Culprit3 Aspiring Aquascaper

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    I would go off of PAR. I think its generally 60+ PAR is high tech. Some people say 80+.
     
  3. keithgh

    keithgh Moderator Staff Member

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    RGBxLT

    This is certainly one for the DIY and lighting experts.

    I am positive Zeus would certainly be able to assist you.

    Keith:cat::cat:
     
  4. John Whatmough

    John Whatmough Aspiring Aquascaper

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    Dr Kevin Novak may have answers to this on his You Tube channel in his lighting LED series ,for a general lighting guide Dennis Wong YT is a great watch
     
  5. keithgh

    keithgh Moderator Staff Member

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    John

    Would you post that YT link please.

    Keith:cat::cat:
     
  6. John Whatmough

    John Whatmough Aspiring Aquascaper

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  7. John Whatmough

    John Whatmough Aspiring Aquascaper

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    There are quite a few others in his lighting series also on UKAPS in the DIY threads a member shows how to completely make a LED light fitting from scratch, I think it’s fairly recent
     
  8. Zeus

    Zeus Active Aquascaper

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    Hi and welcome.

    PAR is the only light measurement that's practical, if you can get the PAR data for the light that would be ideal
    Going off watts for LEDs is a waste of time, as there are so many different chips almost coming out weekly.
    I think 6500k is nice.
    Plants don't care about colour, they care about PAR.
    Do you plan a carpet? Getting one 50cm deep is doable OFC, but you need more light, which leads to more potential algea problems.
    What filters/pumps do you plan you will need good flow with 50cm deep tank. What returns lily pipes/spray bars?
    What ferts you planning? EI?
    What plants/hardscape AS?
    Have you got a local water report?

    Lumens is a rough guide and helpful but dated IMO

    Some T5 tubes may be a good starting place cost wise. You can get dimammable ballasts which are great but not cheap.

    Getting the flow right, stable [CO2] for the first four hours of photoperiod is key to success, having [CO2] optimal for when lights come on.

    What CO2 setup you planing?

    Hope that's of some help.

    Zeus
     
    keithgh likes this.
  9. keithgh

    keithgh Moderator Staff Member

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    Zeus an excellent reply.

    Keith:cat::cat:
     

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