LED (Light Emitting Diode): Use solid semiconductor chips to produce light-emitting materials. When a forward voltage is applied to both ends, the carrier fluid in the semiconductor recombines, releasing excess energy and causing photons to emit visible light. Advantages: high efficiency, pure light color, low energy consumption; durable and long life; safe and environmentally friendly, instant start-up; anti-vibration, cold light source; long-term lamp body surface heat is low, and good heat dissipation. Get close to the object without making it anxious. Based on this feature, the LED can be placed above the plant horizontally or vertically. Disadvantages: Weak brightness and high cost.
The main reason is that the light required for photosynthesis of plants is different from the light we use for daily lighting. Plant growth requires the use of the sun's light energy to assimilate carbon dioxide (CO2) and water (H2O) to produce organic matter and release oxygen. This process is called photosynthesis.
And only LED lights can meet the above conditions, because only LED lights can emit the spectrum needed for plant growth, and plants must have suitable light rays for photosynthesis. The spectrum range has an important impact on plant physiology.
Let's take a look at the effects of different wave lines on plants:
280 ~ 315nm: minimal impact on morphology and physiological processes;
315 ~ 400nm: Less absorption of chlorophyll, which affects the photoperiod effect and prevents stem elongation;
400 ~ 520nm (blue): The absorption ratio of chlorophyll and carotenoids is the largest, and has the greatest impact on photosynthesis;
520 ~ 610nm (green): the absorption rate of the pigment is not high;
610 ~ 720nm (red): Low chlorophyll absorption rate, which has a significant impact on photosynthesis and photoperiod effects;
720 ~ 1000nm: Low absorption rate, stimulating cell elongation, affecting flowering and seed germination >1000nm: Converted into heat.
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