I dont get it! (LED spectrum)

Discussion in 'Lighting' started by Scales, May 5, 2011.

  1. I keep hearing about people talking about CRI, lumens, and PAR. In LEDs for growing why does CRI matter if the LED is trying to match chlorophyll? Lumens are part of the visual spectrum so why does it matter at all if the PAR is 500 at 4'x4' and 48" throw. Why would you need more lumens or higher CRI if the PAR absorption and chlorophyll are the maximum amount the plant can possibly take in? Seems like lots of work to get a straight answer.
  2. CRI has no relevance to LED grow lights at all.

    Lumens don't have much relevance either.

    I don't get what you are trying to say about the "maximum amount" the plant can take in.
  3. From what I understand 500 PAR is the max absorption a plant can process. So if the plant get bombarded with 10,ooo PAR it will only absorb 5% of that 10,ooo.
    I think...or at least that what I've read.

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