Light Meter

Discussion in 'Planted Tank Equipment' started by Sico, Jun 1, 2020.

  1. Sico
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    Sico Green fingers

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    Anyone in the Randburg (or general) area have a light meter I can borrow for a day? I've put some new LED lights in my tank, but they don't seem to be what I ordered and I need to check before I leave the country again for 4 months and come back to an aquatic desert...
     
  2. tyronegenade
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    tyronegenade Specialist

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    I used a lux meter on my phone to measure my light intensity in the aquarium.

    I measured the lux just beneath the cover glass by removing the coverglass and taking a reading (measurement A). I then repeated by holding the phone beneath the cover glass(measurement B). Why? Because I want to know how much light the coverglass blocks (divide B by A).

    I then did this again but this time I had the phone in a ziplock bag (measurement C). Why? because I want to know how much light the plastic bag blocks (divide C by B = D).

    I then submerged my phone in the aquarium, straight to the bottom, and recorded a measurement (measurement E).

    So, what I did was divided E by C to see how much light was lost. Now divide E by D to give the real light measurement in lux at the bottom of the aquarium.

    Plug this lux value into one of the options at https://www.waveformlighting.com/horticulture/convert-lux-to-ppfd-online-calculator . I'm using high CRI LEDs of about 6500K so I selected that option and clicked calculate.

    Use an old phone that can load a lux meter app or test the ziplock bag to save your phone.
     

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