#ppf value

[yaorong]

The spectrum of LED grow lights is not the best only the most suitable

Because the spectrum of LED grow lights can be designed, the spectrum of LED grow lights shows diversity, but the spectrum is not the best, only the most suitable for plant planting needs, so when choosing or customizing, you must use the plant to be planted. The spectrum shall prevail.

Luminaire efficiency of LED grow lights

The luminaire efficiency of the LED grow light is the ratio of the PPF value of the luminaire to the PPF value of the light source. This value is less than 1, which is related to the light distribution design of the secondary optics. The efficiency of the LED grow light is usually between 0.9-0.5, which affects the efficiency of the lamp. The energy consumption index and planting efficiency of the lamp, the efficiency of the LED grow light lamp with the lens design will not exceed 0.8.

About spectral ratio

When many LED grow lights are talking about the spectrum ratio, this issue requires understanding of the LED chip supply specifications. LED chips are graded and supplied according to the radiant power of the same chip size. The spectrum of LED grow lights provided according to the lamp bead ratio may be There will be a 30% deviation in the ratio, which is one of the reasons why the planting effects of different batches of the same product are different. The correct spectrum ratio is the radiant power ratio of the RGB band according to the PAR wavelength range, so that the products provided will have a data basis.

Uniformity of radiation surface and radiation field

For the LED grow lamp spectrum with a combination of multiple single-wavelength lamp beads, the uniformity of the radiation surface after the multiple radiation is mixed needs to be considered, mainly the arrangement of the lamp beads, the light distribution design, the installation height of the lamps, etc.; the uniformity of the radiation field For the three-dimensional planting of the shelf structure, and for the LED grow light with lens, it is necessary to make it clear that increasing the installation height to improve the uniformity of the radiation surface results in the reduction of the PPFD value by the square of the distance.

Features of full-spectrum LED grow lights:

1. Increase yield: The energy required for plant growth comes from the photosynthesis of plants, and full-spectrum LED grow lights can supplement light to plants when the light is insufficient, and promote the accumulation of plant dry matter, thus achieving the purpose of increasing yield.

2. Market early: Full-spectrum LED grow lights can shorten the growth cycle of plants, and can make crops go on the market 7-15 days in advance, which greatly increases the economic income of users.

3. High luminous efficiency: 90% of the light emitted by full-spectrum LED grow lights can be absorbed by plants. Traditional plant lights such as high-pressure sodium lamps and metal halide lamps can only absorb 8-10% of the light during photosynthesis.

4. Low power consumption: The full-spectrum LED grow light consumes very little power, so users do not have to worry about the cost of the fill light.

5. Long lifespan: Full-spectrum LED grow lights have an extremely long lifespan, with an ultra-long lifespan of 50,000 hours.

6. Environmental protection: The full-spectrum LED grow light is safe, environmentally friendly and does not contain toxic mercury. Our LED grow lights use 10%-30% more energy than traditional lights. Consuming less energy can reduce greenhouse gas emissions into our environment.

The plant growth process generally includes seed germination, leaf development, flowering, and fruiting stages. The transition from seed to seedling to mature plant can be achieved. We can shorten the growth cycle of crops by customizing the spectrum.

When light shines on the plant, the light energy is captured by the pigment in the leaf chloroplast, which absorbs most of the blue and red light. Therefore, in different environments, plants have formed different adaptation strategies in the long-term adaptation and genetics. , There are sun plants, shade plants and shade-tolerant plants.

Different target organs have different spectra. For example, in the cultivation of leafy vegetables, what we need is leaves, while solanum fruits are for fruits. For rhizomes, we need tubers. The target organs are inconsistent. There are big differences in physiological and biological characteristics, and there may also be differences in spectra. . Depending on the purpose of the implementer, the spectrum is also different. For example, by appropriately increasing the far-red light content of LED grow lights to promote early flowering, using ultraviolet light to increase the content of secondary metabolites and so on. Differences in reproduction methods will also affect the use of the spectrum. For example, tissue culture, cuttings, grafting, substrate culture and hydroponics and other propagation methods are quite different, which will affect the selection of the spectrum.

[yaorong]

What choosing lamp beads should pay attention to when buying LED grow lights?

Customers should pay attention to every detail when buying LED grow lights. Every grower hopes to buy a good LED grow light to ensure that he does not spend money in vain and is responsible for his own plants. Today, Yaorong Technology will pay attention to what aspects of the lamp beads selection when buying LED plants. Let’s share.

The driving current of the LED grow light lamp bead is best not to exceed the specification current. The current chip current specification is close to the upper limit of the chip's tolerance, although the driving current can be increased by improving the heat dissipation to obtain a higher PPF value and lamp bead power Also increase, the increase of PPF and power is non-linear, and the result is that the QE value decreases instead.

Tip: By reducing the drive current of the lamp bead is an effective way to obtain a higher QE value.

LED grow light beads are current devices, try to choose a lower junction voltage (Vf), which can increase the QE value correspondingly, and lower Vf can also reduce the heat of the lamp beads. High-power plant lights are especially suitable for the choice of Vf. important.

The radiation efficiency of the LED grow light beads determines the amount of heat generated by the plant lamp.

The heating power of the LED grow light beads = (1-radiation efficiency ratio) * electric power.

The actual thermal power of the LED grow light can be calculated by testing to check whether the radiation efficiency value is correct.

Under the premise of the ability to design the spectrum, the discontinuous spectrum with the ratio of monochromatic lamp beads will be guaranteed in the light attenuation index. When using continuous spectrum lamp beads, both the light decay index and the blue shift index are the first factors to be considered. The cost performance of continuous spectrum lamp beads is advantageous.

The continuous spectrum needs to pay attention to the indicators of R:B and R:FR. Excessive green light radiation will cause QE distortion.

The abnormal measurement parameters of LED grow lights are mainly to observe the radiation efficiency and QE value. The QE value is relatively intuitive, and the abnormalities of these two indicators need to be re-measured.

I am most worried about the measurement error and false standard of the LED chip. I have always emphasized that the LED grow light is a parameterized product. The LED grow light sells the spectral parameters, and the spectral parameters are distorted, and the planting effect is impossible to talk about.

For measurement errors and virtual standard parameters, my spectrum design theory sets up a detection link, that is, the XD factor. Through the XD factor, we can measure the illuminance value and use the XD factor to convert to PPFD. This PPFD can be used to verify Whether the QE is accurate or not is the innovative point of our plant light spectrum technology. This closed-loop design theory more reliably ensures the accuracy of the plant light's spectral parameters.

The cost-effective judgment of LED grow light beads

For the purchase of lamp beads, what is most concerned about is the cost performance of the lamp beads. Usually, people compare the prices of similar packages. We provide a calculation formula for the cost of lamp beads, which can easily compare the pros and cons of product prices.

The price/performance ratio of the lamp beads = QE/price, which indicates the QE value of the unit price.

LED grow light red and blue lamp beads ratio layout

All the plans of LED grow lights must be customized around plants. What kind of shape the plants need to grow into is cultivated according to the needs of people. Therefore, when looking at the ratio of red and blue beads of LED grow lights, the plant must be considered first. Growth needs and human needs.

When LED grow lights are used to supplement light to plants, the source of most of the light for plant photosynthesis is LED grow lights. The different light qualities of LED grow lights have different physiological meanings to plants. LED grow light lamp beads chips are mainly red lamp beads, blue lamp beads, and full-spectrum lamp beads. The main function of red light on plants is to adjust the photoperiod of plants, and the main function of blue light is to affect the movement of leaves and plastids, to a certain extent Inhibit the flowering and fruiting of plants; the main band of full-spectrum lamp beads is also the red and blue spectrum.

It can be seen from the effect of red and blue light that when choosing the ratio of red and blue LED grow lights, you must first determine what plants to plant and what growth form they achieve. For example: lettuce planting, lettuce is mainly stems and leaves, so it is necessary to choose blue light that stimulates the quality and yield of stems and leaves, then the proportion of blue light bulbs of LED grow lights can be increased appropriately; another example: tomato planting, our purpose is to eat and Large, round, healthy and green high-quality tomatoes, that is, the purpose of stimulating their flowering and fruiting during the planting process, at this time the ratio of red lamp beads for LED grow lights can be increased appropriately.

Since the main function of red light is to promote the flowering and fruiting of plants, and the main function of blue light is to promote the growth of plant stems and leaves, then we can choose monochromatic light for some plants. Wouldn’t it be better, but the photosynthesis process is extremely complicated, with light response and darkness. Each step of the reaction has the direct and indirect participation of light, and each of these steps determines the final morphogenesis of the plant.

When purchasing LED grow lights, the ratio of red and blue lamp beads can be obtained from the supplier. If you have special requirements for your own planting, you can buy a small amount of test first, and find the light distribution that is most suitable for your own planting.