LED plant growth lights are common in indoor and professional gardening. However, with so many items on the market, many growers wonder: What spectrum and light intensity do plants need and prefer? Effective indoor growing requires understanding the complex connection between plants and light. Plants require certain wavelength, intensity, and cycle of light through photoreceptors.
Spectrum is plants' only language
Plant light needs differ greatly from human needs. For photosynthesis, they need blue (400-500 nanometers) and red (600-700 nanometers) visible light. Blue light regulates plant growth, supporting robust stem and leaf growth and making plants appear compact and healthy. In contrast, red light signals plant blossoming and fruiting, stimulating flowering, fruit development, and root expansion. Advanced full-spectrum LED lights imitate the natural day and night cycle with far-red light, better regulating plant physiological cycles and morphological growth.
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The effects of different spectrum ranges on plant physiology: |
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280 - 315nm |
Minimal impact on morphology and physiological processes. |
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315 - 400nm |
Low chlorophyll absorption,Affect the photoperiod effect,Prevent stem elongation. |
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400 - 520nm(blue) |
The absorption ratio of chlorophyll and carotenoids is the largest,Greatest impact on photosynthesis. |
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520 - 610nm (green) |
Pigment absorption rate is not high. |
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610 - 720nm(red) |
The absorption rate of chlorophyll is low, which has a significant influence on photosynthesis and photoperiod effect. |
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720 - 1000nm |
Low absorption rate, Stimulate cell lengthening, Affect flowering and seed germination. |
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>1000nm |
Converted into heat. |
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Growth rhythm depends on light intensity and period
Not only is spectrum "quality" important, but so are light "quantity" and "duration". Light intensity (PPFD, photosynthetic photon flux density) controls photosynthesis. For optimal yields, tomato and pepper plants need 600-900 μmol/m²/s of light intensity, while leafy crops and immature plants only need 200-400 μmol/m²/s. The daily light cycle must match the plant's photoperiod. Short-day plants like strawberries need enough darkness to flower, whereas long-day plants like lettuce need more than 14 hours of light to grow robustly.
Choose professional lighting for various situations
Understanding spectrum and light intensity simplifies LED light choices. Home growers can use low-power, high-blue light lights to grow young plants, succulents, and herbaceous spices. However, commercial greenhouse supplementary lighting and cannabis production facilities demand professional-grade LED light strips or ceiling lights with increased light intensity, more red light, and a uniform lighting scheme. Successful indoor cultivation requires designing and compiling a complete set of custom "light recipes" for plants, from spectrum, intensity, and cycle, to maximize plant growth and produce healthy, efficient, and high-quality harvests.
For more details about our offerings, please contact us at bwzm18@ledbenweilighting.com.
