
Particular wavelengths of light along the light spectrum stimulate specific functions within the plant. For example, red wavelengths help stimulate flower and bud growth, and blue wavelengths help stimulate branch and leaf growth.
Some LED grow lights target specific wavelengths of light — like 660nm red or 465nm blue — by dying their chips a specific color. Other chips are covered and offer spectrums of light like 3500k or 5000k that give you a wide range of wavelengths depending on the phosphor used. Both are beneficial for your plants, so how are you supposed to know which ones to go with?
In order to know what to choose, it’s important to know what your plants need. Here are the wavelengths your plants will need:
430 to 460 nm blue wavelengths are necessary for root growth.
640 to 680 nm red wavelengths are necessary for stem growth, as well as chlorophyll, flower, and bud production.
IR (710 nm) helps stimulate resin production.
UV (10000k) helps strengthen stems and create stronger plants.
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