Next, we will introduce the standard installation of the fill light, which is generally installed according to the standard, and the introduction and selection of the light source in the greenhouse.
Greenhouse fill light installation introduction( indoor strawberry plant with LED grow light test)
Most of the large-area fill light is currently installed by hanging. According to the installation height and the light distribution angle of the plant lamp, the illumination area of one lamp can be calculated. The instrument can test the PPFD at this height. The plant needs to be photosynthetic. There is a critical point for action. We call it the light compensation point. Only when PPFD is higher than this point, plants can absorb carbon dioxide and release oxygen to form carbohydrates.
Selection of fill light source in greenhouse
The selection of the fill light source for greenhouse greenhouses should be based on the following two principles:
One is the purpose of filling light;
Second, the performance price ratio of the light source
The purpose of fill light usually has two.
The first is to inhibit or promote the flower bud differentiation and adjust the flowering period in greenhouse greenhouses, that is, to meet the needs of crop photoperiod. This kind of fill light generally requires red light, but the illuminance is relatively low, as long as there are dozens of lux. Illumination can meet the needs, using incandescent lamps.
The second is to promote photosynthesis of crops in greenhouses, promote crop growth, and supplement natural light. The requirement of the fill light for the light source is that the illumination should be higher than the light compensation point of the plant, generally above 3000lx; the illumination has a certain adjustability; the light is rich in red and blue light; there is a certain spectral component; It is good to approximate the continuous spectrum of sunlight.
This type of fill light uses a high pressure gas discharge lamp or a fluorescent lamp. In addition, the requirements for illuminance and spectral characteristics are different for crop types and varieties cultivated in greenhouses. Therefore, the choice of light source should fully consider the type of crop and the need for illumination in different growing seasons.
After determining the illuminance value to be used, when selecting and configuring the light source, the luminous flux of the light source should be selected, and then the light source type should be selected according to the luminous flux value. When selecting the light source type, the light source of different varieties should be noticed, and the luminous flux is different. Even if the light source of the same kind has different power, its luminous efficiency (luminous efficiency), that is, the luminous flux generated per watt of power, is different. Therefore, when the light source is selected, the power of the light source cannot be used as the basis. The actual light energy it has should be considered. The light energy of several common light sources is as shown above.
The above selection of the source of light from the demand for crop fill light is introduced. The second basic principle that should be considered when selecting the light source is the following, that is, the performance price ratio of the light source.
Different types of light sources, their initial installation cost, service life, light efficiency, spectral characteristics, available energy, etc. are all different, should be considered comprehensively. Generally speaking, the light source with high luminous efficiency has a higher initial installation cost, but after years of operation, its annual average cost is relatively low. This is because the higher the light efficiency of the light source, the smaller the power consumed by the same illumination level. The overall economic benefits will be higher. Therefore, for long-term operation of the light source, it should be appropriate to select the light effect is high.
Arrangement of fill light source in greenhouse
In order to make the illumination distribution of the illuminated surface as uniform as possible, the illuminance distribution characteristics of the light source and the reasonable installation position should be fully considered when arranging the light source. Different light sources have different luminosity distribution characteristics. For example, a household 100W incandescent lamp has a luminosity distribution characterized by a relatively uniform luminosity distribution in all other directions except for a near-noise angle of nearly 60° above the bulb. If the reflector cover is placed at an angle of nearly 120°, the light is concentrated in the range of 120° below, the uniform illumination can be obtained, and the 60W bulbs for cultivation are mainly distributed in the 120° angle below the slope; The direction is close to no light.
Another example is the long-arc xenon lamp, except that there is almost no light in the 20° angle at both ends of the lamp, and the luminosity distribution in the other directions is basically uniform. The installation location includes the installation height and the layout of the lamp. The installation height of the general light source is within 1-2m from the crop, and the layout mode has a single row uniform layout, a double-row grid uniform layout, etc., which layout method should be adopted The geometry of the surface to be illuminated is selected by certain calculations and tests. The same illumination surface, different layouts, the resulting light distribution will be different.
For a greenhouse with a span of 5.4m and a length of 18m, a special lamp for 8 60w cultivation at a height of 1.5m is evenly arranged according to a single row. The result is an area ratio of 4% below 20lx and a minimum illumination of 4 corners. It is 10lx, the average illuminance is 46lx; the uniform layout is arranged in a double-line grid. The area ratio of 20lx or less is zero, and the average illuminance is 34lx. It can be seen that the illuminance is evenly distributed according to the uniform layout of the double-row grid.
If you need more information about the shed fill light, please pay attention to @vanqled.com, we will provide you with more articles.
Greenhouse fill light installation introduction( indoor strawberry plant with LED grow light test)
Most of the large-area fill light is currently installed by hanging. According to the installation height and the light distribution angle of the plant lamp, the illumination area of one lamp can be calculated. The instrument can test the PPFD at this height. The plant needs to be photosynthetic. There is a critical point for action. We call it the light compensation point. Only when PPFD is higher than this point, plants can absorb carbon dioxide and release oxygen to form carbohydrates.
Selection of fill light source in greenhouse
The selection of the fill light source for greenhouse greenhouses should be based on the following two principles:
One is the purpose of filling light;
Second, the performance price ratio of the light source
The purpose of fill light usually has two.
The first is to inhibit or promote the flower bud differentiation and adjust the flowering period in greenhouse greenhouses, that is, to meet the needs of crop photoperiod. This kind of fill light generally requires red light, but the illuminance is relatively low, as long as there are dozens of lux. Illumination can meet the needs, using incandescent lamps.
The second is to promote photosynthesis of crops in greenhouses, promote crop growth, and supplement natural light. The requirement of the fill light for the light source is that the illumination should be higher than the light compensation point of the plant, generally above 3000lx; the illumination has a certain adjustability; the light is rich in red and blue light; there is a certain spectral component; It is good to approximate the continuous spectrum of sunlight.
This type of fill light uses a high pressure gas discharge lamp or a fluorescent lamp. In addition, the requirements for illuminance and spectral characteristics are different for crop types and varieties cultivated in greenhouses. Therefore, the choice of light source should fully consider the type of crop and the need for illumination in different growing seasons.
After determining the illuminance value to be used, when selecting and configuring the light source, the luminous flux of the light source should be selected, and then the light source type should be selected according to the luminous flux value. When selecting the light source type, the light source of different varieties should be noticed, and the luminous flux is different. Even if the light source of the same kind has different power, its luminous efficiency (luminous efficiency), that is, the luminous flux generated per watt of power, is different. Therefore, when the light source is selected, the power of the light source cannot be used as the basis. The actual light energy it has should be considered. The light energy of several common light sources is as shown above.
The above selection of the source of light from the demand for crop fill light is introduced. The second basic principle that should be considered when selecting the light source is the following, that is, the performance price ratio of the light source.
Different types of light sources, their initial installation cost, service life, light efficiency, spectral characteristics, available energy, etc. are all different, should be considered comprehensively. Generally speaking, the light source with high luminous efficiency has a higher initial installation cost, but after years of operation, its annual average cost is relatively low. This is because the higher the light efficiency of the light source, the smaller the power consumed by the same illumination level. The overall economic benefits will be higher. Therefore, for long-term operation of the light source, it should be appropriate to select the light effect is high.
Arrangement of fill light source in greenhouse
In order to make the illumination distribution of the illuminated surface as uniform as possible, the illuminance distribution characteristics of the light source and the reasonable installation position should be fully considered when arranging the light source. Different light sources have different luminosity distribution characteristics. For example, a household 100W incandescent lamp has a luminosity distribution characterized by a relatively uniform luminosity distribution in all other directions except for a near-noise angle of nearly 60° above the bulb. If the reflector cover is placed at an angle of nearly 120°, the light is concentrated in the range of 120° below, the uniform illumination can be obtained, and the 60W bulbs for cultivation are mainly distributed in the 120° angle below the slope; The direction is close to no light.
Another example is the long-arc xenon lamp, except that there is almost no light in the 20° angle at both ends of the lamp, and the luminosity distribution in the other directions is basically uniform. The installation location includes the installation height and the layout of the lamp. The installation height of the general light source is within 1-2m from the crop, and the layout mode has a single row uniform layout, a double-row grid uniform layout, etc., which layout method should be adopted The geometry of the surface to be illuminated is selected by certain calculations and tests. The same illumination surface, different layouts, the resulting light distribution will be different.
For a greenhouse with a span of 5.4m and a length of 18m, a special lamp for 8 60w cultivation at a height of 1.5m is evenly arranged according to a single row. The result is an area ratio of 4% below 20lx and a minimum illumination of 4 corners. It is 10lx, the average illuminance is 46lx; the uniform layout is arranged in a double-line grid. The area ratio of 20lx or less is zero, and the average illuminance is 34lx. It can be seen that the illuminance is evenly distributed according to the uniform layout of the double-row grid.
If you need more information about the shed fill light, please pay attention to @vanqled.com, we will provide you with more articles.
评论
发表评论