The effect of the LED plant light flux on the plant growth lamp parameters
All visible light sources have an important parameter called luminous flux, and plant lights are no exception. Luminous flux is of great significance to human visual perception. On the one hand, according to the difference of luminous flux, the light response felt by the naked eye is different; on the other hand, according to the difference of human vision, the naked eye has different visual perception of the same luminous flux in the same wavelength band. same.
Understand the relationship between the naked eye and the luminous flux, what is the relationship between the LED plant growth luminous flux and the plant? Let's first look at the concept of luminous flux.
Luminous flux concept
Luminous flux refers to the radiant power that the human eye can feel, which is the product of the radiant energy of a certain band per unit time and the relative viewing rate of this band. English: luminous flux, the unit is lumens (lm). Because human eyes have different relative viewing rates for different wavelengths, even if the radiant power of different wavelengths is the same, the luminous flux is not the same. Conversely speaking, even if the luminous flux is the same, if it is light of different wavelengths, the radiant power is also different.
Luminous flux calculation method
Luminous flux refers to the derived amount of radiant flux evaluated in accordance with the internationally prescribed standard human visual characteristics. The representative symbol is Φ, and the calculation formula is:
The formula for calculating the lumen value of the plant growth lamp LED plant light flux
Among them, Km is the maximum value of spectral luminous efficiency 683lm/W, V(λ) is the standard standard spectral luminous efficiency function, Φeλ is the spectral density, and λ is the spectral luminous efficiency. 1lm is equal to the luminous flux emitted by a point light source with a uniform luminous intensity of 1 candela (1cd) in a unit solid angle of 1 steradian (sr), that is, 1lm=1 cd·sr.
The relationship between LED plant light flux and plant growth
Luminous flux can be simply understood as the amount of light passing through unit time and unit area. Just like water flow, it flows out, flows through or flows into less water in one second, while luminous flux flows out, flows through or flows into less light in a second. That is to say, the red light with a wavelength of 680 can reach 1000 (lm) under certain conditions, and the green light with a wavelength of 520 can also reach 1000 (lm) under another condition.
For plants, the most important thing about LED plant lights is to emit the red and blue lights needed by plants, or full-spectrum plant lights that simulate sunlight to assist in planting high-quality and high-volume plants, which affects the lighting effect of LED plant lights. The main factors include light quality, light intensity, and light duration. So the same is the red and green light with a luminous flux of 1000 (lm). One plant absorbs a lot, while the other plant hardly absorbs it. Therefore, the luminous flux cannot be completely used as an LED plant growth lamp, which may affect the plant's supplementary light effect. the elements of.
However, if it is the same red light required by plants of the same wavelength, the greater the luminous flux, it indirectly indicates that the red lamp beads of the LED plant lamp emit more light, the plants can get more sufficient light, and the growth effect will be better.
In summary, for the field of using LED plant lights to grow plants, luminous flux is not the main parameter to measure the value of LED plant growth lights, but it can be used as a reference. If the wavelength is determined, the light source with the greater luminous flux The stronger the light that can be provided.
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