1. Visible light wavelength of LED plant growth light (4*10-7m----7*10-7m)
Light color----------wavelengthλ(nm)----------represents wavelength
Red (Red)-----780～630----------700
Orange--630～600-------620
Yellow --600～570-------580
Green--570～500-------550
Cyan---500～470----------500
Blue---470～420----------470
Violet -420～380----------420
2. Color temperature and lumens of plant lights
The color temperature and lumens of plant lights are seen by human eyes, while the photosynthesis of plants does not depend on color temperature and lumens. 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.
3. The effect of spectral range on plant physiology
280~315nm - minimal impact on morphology and physiological process
315~400nm - less absorption of chlorophyll, 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 pigment is not high
610~720nm (red) - low absorption rate of chlorophyll, 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
From the above data, different wavelengths of light have different effects on plant photosynthesis. The light required for plant photosynthesis has a wavelength of about 400~720nm. Light at 400~520nm (blue) and 610~720nm (red) contribute the most to photosynthesis. The light of 520~610nm (green) has a very low rate of absorption by plant pigments.
4. The principle that white light is not good for plant growth
According to the above principles, plant lights are made into three forms of red and blue combination, all blue, and all red to provide light with two wavelengths of red and blue, covering the wavelength range required for photosynthesis. In terms of visual effects, the red and blue combination of plant lights is pink.
For white LED lamps, the most common is to use a blue core to excite yellow phosphors, which combine to produce a visual white light effect. On the energy distribution, there are two peaks in the blue region at 445 nm and the yellow-green region at 550 nm. The 610~720nm red light required by plants is very lacking. This explains why plants grow unfavorably under the illumination of white LEDs.
5. The chromatographic ratio of red and blue lights of plant lights
Generally, it is appropriate to be between 5:1 and 10:1, and usually choose a ratio of 7 to 9:1.
6. Fill light distance
When using a plant lamp to fill the plant with light, the height from the leaves is generally about 0.5 meters.
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