Brightness is the physical quantity of the luminous/reflective intensity of the surface of the luminous/reflector when viewed from the human eye. It is the ratio of the luminous intensity (light intensity) in the direction of observation to the luminous/reflective area seen by the human eye. That is, the luminous intensity per unit projected area. The unit is candela/square meter (cd/m2). The intensity of brightness is directly determined by the intensity of light.
Almost all plant growth is inseparable from light. Under strong light where the light quality meets plant needs and other external conditions for plant growth are reasonable and constant, the rate of plant photosynthesis increases with the increase in light intensity, and reaches light saturation. Do not increase after the point.
For plants, the light absorbed by photosynthesis is only a certain part of the spectrum, but there are many kinds of visible light spectrum. If the brightness of green light increases indefinitely, because it is not absorbed by plant photosynthesis, it has no meaning, so In a broad sense, the brightness is not necessarily proportional to the photosynthesis rate of plants, but LED plant lights are designed according to the demand for light by plants. The main spectrum is red and blue, which meets the needs of light quality for plant growth, so here we mainly analyze red The relationship between blue light brightness and plant growth.
The brightness is determined by the light intensity. The light intensity is the luminous flux emitted per unit solid angle. It can be seen that the brightness and the luminous flux are also directly proportional, so the effect of the brightness of the LED plant lamp on the growth of plants can be referred to the relationship between luminous flux and plant growth.
The brightness of LED plant lights can be understood as the luminous intensity received per unit area. According to the relationship between the light quality required for photosynthesis of plant growth, it can be concluded that the brightness of LED plant lights is directly proportional to the photosynthesis rate of plants. When the photosynthesis rate of plants is After reaching the light saturation point, the photosynthesis rate of plants no longer increases with the increase of the brightness of the LED plant light.
Although the luminous flux can be used as a reference standard for the brightness of the LED plant light, it does not mean that the brightness of the LED plant light will increase when the plant light flux is large, because it is also related to the area. If it is in the same area and the same distance, The greater the light flux of the LED plant, the higher the brightness, and the plant's photosynthesis rate will accelerate and stop increasing when it reaches the light saturation point. If it is not in the same area and distance condition, the brightness will be lower due to the increase of the illuminated area.
The reason why we will add accessories such as lenses and reflectors when assembling LED plant lights is to enable the lamps to better condense the light and play the biggest role of each LED plant light bulb.
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