For plant lighting, the first thing we need to know is that not all light can be used by plants, and basically only blue and red light can be absorbed by plants.
"Two safety" of plant illumination
When lighting plants, we need to notice "two security":
First, people-oriented, users-the safety of growers.
For example, is the intensity and exposure time of ultraviolet or blue light suitable for human beings to work long hours in this environment? Is it possible to work in such an environment for a long time to be harmful to the health of the staff? This point is to focus attention.
In the plant to do a good job of lighting at the same time, to pay attention to the inside for a long time staff visual comfort, to avoid workers in the work within 20 minutes after leaving, see everything is green, but also appear dizziness, nausea and other conditions.
The other is the safety of plants-the stability of yield and the stability of nutrients content, different light has different effects on plants.
▲ light of different wavelengths has different effects on plant growth.
With the proper use of light, we can control the flowering of plants in advance or prolong the blooming and fruiting periods of plants.
When it comes to controlling plant growth, you have to say something about the light formula for plant lighting, which is an important factor affecting plant production.
What is a light formula?
In the popular perception, the red and blue light blend together to form the magenta is an optical formula.
In fact, this kind of cognition is strictly inaccurate.
The true light formula contains the following six parts: Light quality and light intensity, illumination time, installation position, lighting and quantity, illumination uniformity and other environmental factors.
Only the interaction or coupling of these six factors can form a true light formulation. is not a simple "blue + red" is the light formula, you can "a recruit fresh, eat the day".
Because the LED itself is a cold light source, the closer the light source is to the plant, the higher the efficiency of the energy utilization, and the combination of the blue and red fluorescent lamps for different plants, as well as the illumination uniformity required by different plants, so these factors all affect the composition of the final light formula.
Lighting for plants
Different plants in different growth stages of the demand for light is not the same, only a lamp can not meet the majority of plant growth or the same plant in different growth stages of the unique growth needs.
Want to install only one kind of lamps can be once and for all, can only say the idea is good, but not realistic. Now the technology can not do this step, or this may be the laboratory products have been, but can not achieve large-scale production.
Because of the high cost of plant lighting, so whether you are to avoid the purchase of inferior plant lighting products, or want to do a good led plant lighting designer, all need to pay attention to the following indicators and performance:
1. Uniformity of illumination
2. The rationality of the light quality group
3. Reliability of heat dissipation
4. Waterproof, dustproof and corrosion resistant
5. Suitability of power
6. High efficiency of luminous surface
7. Visual Comfort
Different kinds of plants require different illumination uniformity.
For this point there are two indicators: "Uniformity between strains" and "regional uniformity", these two indicators are generally required to achieve 95% or even more than 98% is a qualified lighting. In addition, in addition to the uniformity of the optical quantum flux, the uniformity of spectral distribution is also a point that can not be neglected, in the optical design and plant lighting design, these indicators have a pivotal position.
As mentioned above the different plants in different growth stages of the need for the light quality is different, because different wavelengths of light on the growth of plants have different effects, the need to use different lamps to provide plants with different wavelengths of light, so it is necessary to reasonably group with different light rays.
The future trend of plant illumination
After talking about the status of plant lighting, let me think about the future trend of plant lighting according to the products that have appeared now.
The LED light source, which is nearly identical to the solar spectrum, has appeared and has just been mass produced.
Integrated agricultural intelligent sensors have been developed and put into application networking and cloud services links.
With the development of artificial intelligence, the future development trend of agriculture, must be to the direction of small-scale farms.
A small farm, can be a roof, can be an underground garage, can also be a balcony. As long as a small piece of land, we can basically meet our own nutritional intake, and even can be shared with neighbors. and the main service of plant lighting in the future is these small farms.
I believe that small farms will certainly be the future direction of plant lighting services.