• Why is the photosynthetic activity maximum in red and blue light?

  • @potterhead
    Leaves are green. That’s because chlorophyll is green. Being green means that the leaves are absorbing all of the colors EXCEPT green. So reds, yellows, blues, purples…just not green.

    Red light is generally less energetic than blue - and to give plants the maximum possibility to perform photosynthesis, a blue light is far better than red. In fact, specifically, light at 450 nanometers is best. “Grow lights” that are made for growing plants indoors are designed to put out more energy in the 400 to 500 nanometer range (blue) for this precise reason.

    However, plants also use red light to trigger things like flowering and germination - so providing them ONLY blue light isn’t enough.


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