Do you know how to select the right LED grow lights for the greenhouse? And what’s the install standard of LED lights in the greenhouse? Today, we will tell you how to choose the right LED grow lights and how to install it in a greenhouse.
How to install LED grow lights in the greenhouse?
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 lights, the illumination area of lights can be calculated. The instrument can test its PPFD at this height.
Plants need a critical point for photosynthesis. We call it light compensation points. Only when PPFD is above this point, plants can absorb carbon dioxide and release oxygen to form carbohydrates.
Arrangement of fill light source in greenhouse
In order to make the illumination distribution of the illuminated surface as uniform as possible, when arranging the light source, the luminosity distribution characteristics of the light source and a reasonable installation position should be fully considered.
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 near 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 angles. It is 10lx, the average illuminance is 46lx; it is evenly arranged in a double-row 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 two rows of grids.
How to select the right LED grow lights?
The selection of greenhouse fill light sources is based on the following two principles: the purpose of filling light and the performance-price ratio of the light source.
Purpose of supplement light
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 illuminance 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.
Determine the light source
The requirements for illuminance and spectral characteristics are different for crop types and varieties cultivated in greenhouses. Therefore, when selecting a light source, the type of crop and the need for illumination in different growing seasons should be fully considered.
After determining the illuminance value to be used, when selecting and configuring the light source specifically, 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 type of light source, it should also be noted that different types of light sources have different luminous fluxes. Even for the same type of light source, the luminous efficiency (luminous efficiency), that is, the luminous flux per watt of power, is different depending on its power. of.
Therefore, when selecting a light source, it is not possible to rely solely on the power of the light source, but should consider the actual light energy it has.
Choose high-cost performance
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 high initial installation cost, but after years of operation, its annual cost is relatively low. This is because of 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 choose the highest light efficiency.
After reading this article, if you still don’t know how to choose the right LED grow lights and install it in the greenhouse. Don’t worry about it, you can feel free to contact our customer service and they will help you.