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Thread: LIGHT PPFD from PPF

  1. #1 LIGHT PPFD from PPF 
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    Hi,

    I work on a indoor vertical farm project and i want to have a good undestanding of PPF vs PPFD emitted by LED's.
    I found this LED data sheet from CREE Components:

    - Typical current: 350mA
    - Foward voltage: 2.73V
    - PPF (Ámol/s): 2.2
    - PPF/W (Ámol/J): 2.29

    I would like to know what is the maths for convert PPF to PPFD ?


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  3. #2  
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    Quote Originally Posted by TEDDOL View Post
    Hi,

    I work on a indoor vertical farm project and i want to have a good undestanding of PPF vs PPFD emitted by LED's.
    I found this LED data sheet from CREE Components:

    - Typical current: 350mA
    - Foward voltage: 2.73V
    - PPF (Ámol/s): 2.2
    - PPF/W (Ámol/J): 2.29

    I would like to know what is the maths for convert PPF to PPFD ?
    The "D" stands for density; it's a per-area figure. PPF is the total flux, PPFD is the flux per sq. meter. To go from one to the other requires knowledge of the variation in flux over space, and the geometry of the plant relative to the light source, among others.


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  4. #3  
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    Ok but i try to understand this from CREE Inc.
    This company give a model here: cree.com/led-components/media/documents/CreeXLampHorticultureFeatureSheet.pdf
    From this example they say that 48 red LED model + 144 white LED model can emit 320Ámol/m▓/s. So, in the best conditions as possible, can i accept that 1 red+3 white can emit 6.66Ámol/m▓/s ?
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  5. #4  
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    Quote Originally Posted by TEDDOL View Post
    Ok but i try to understand this from CREE Inc.
    This company give a model here: cree.com/led-components/media/documents/CreeXLampHorticultureFeatureSheet.pdf
    From this example they say that 48 red LED model + 144 white LED model can emit 320Ámol/m▓/s. So, in the best conditions as possible, can i accept that 1 red+3 white can emit 6.66Ámol/m▓/s ?
    As a crude approximation, yes. The reason that this is approximate is that the shape of the beam will not be the same for the two configurations, so your linear scaling law won't be exact.
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  6. #5  
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    Datasheet:
    - Typical current: 350mA
    - Foward voltage: 2.73V
    - PPF (Ámol/s): 2.2
    - PPF/W (Ámol/J): 2.29

    So, can I accept 8.8Ámol/s with 4 led's ?
    So approximately, 8.8Ámol/s * 48 = 422.4Ámol/s ==> 320Ámol/m▓/s ?
    Is there a formula to convert Ámol/s to Ámol/m▓/s ?
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