Enlite Energy Inc
Enlite Energy Inc

The Effect of the Spectrum of LED Grow Lights on Plants

LED grow light is a plant growth auxiliary light specially designed for the production of flowers and vegetables and other plants combined with high-precision technology. Generally, indoor plants and flowers will grow worse and worse over time. The main reason is the lack of light irradiation. By irradiating with LED lights suitable for the spectrum required by plants, it can not only promote its growth, but also prolong the flowering period and improve the quality of flowers.

1. The influence of different spectrums of LED grow lights

Different plants have different requirements for the spectrum, such as red/blue 4:1 for lettuce, 5:1 for strawberries, 8:1 for general purpose, and some need to increase infrared and ultraviolet. It is best to adjust the ratio of red and blue light according to the plant growth cycle.

Below is the effect of the spectral range of grow lights on plant physiology.

280 ~ 315nm: minimal influence on morphology and physiological process.

315 ~ 400nm: less chlorophyll absorption, affecting the photoperiod effect and preventing stem elongation.

400 ~ 520nm (blue): the absorption ratio of chlorophyll and carotenoids is the largest, which has the greatest impact on photosynthesis.

520 ~ 610nm (green): the absorption rate of the pigment is not high.

610 ~ 720nm (red): the absorption rate of chlorophyll is low, which has a significant impact on photosynthesis and photoperiod effect.

720 ~ 1000nm: low absorption rate, stimulating cell extension, affecting flowering and seed germination;

>1000nm: converted into heat.

Therefore, different wavelengths of light have different effects on plant photosynthesis. The light required for plant photosynthesis has a wavelength of about 400 to 720 nm. Light from 400 to 520nm (blue) and 610 to 720nm (red) contribute the most to photosynthesis. Light from 520 to 610 nm (green) has a low rate of absorption by plant pigments.

2. How to choose the spectrum of LED grow lights

The planting process needs to propose the amount of daily radiation based on a certain light quality, or the PPFD value of the planting surface (some planting processes require YPFD value) and photoperiod. The daily radiation determines the PPFD value and the photoperiod. The designer calculates the PPF value (or YPF value) of the LED light source according to the PPFD value, and then performs the spectral design.

It should be noted here that under the same light source PPF value, different light distribution designs, heat dissipation designs and drive designs lead to obvious differences in PPFD values. The manufacturing process has a great influence on the power utilization efficiency of the plant lamp. This influence can be measured by the PPF value and PPFD value per watt of electrical power. The higher the value, the better.

For LED light sources: PPF/w. For planting surfaces: PPFD/w. Comparing these two indicators of plant lamps with the same spectral form, the manufacturer's manufacturing process level can be evaluated.

For different vegetables with different lighting effects, different LED grow lights should be collocated to better shorten the seedling and growth time, improve the product quality (Mass) and quality (Character), operate agricultural products in an entrepreneurial manner and create better profits.

The lamps produced by LED grow light manufacturer Enlite are rich in wavelength types, which are exactly in line with the spectral range of plant photosynthesis and photomorphology. The half-width of the spectral wave is narrow, and the pure monochromatic light and the composite spectrum can be obtained by combining as required, and the light of a specific wavelength can be concentrated to irradiate the crops in a balanced manner. Not only can regulate crop flowering and fruiting, but also control plant height and plant nutrients. The system generates less heat and occupies less space, and can be used in a multi-layer cultivation three-dimensional combined system, achieving low heat load and miniaturization of production space.

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