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What are the spectral parameters of LED plant lights?

2021-09-177

We all know that the spectrum of LED plant lights can be customized, adjusted and promote plant growth. But you may not know the spectral parameters of LED plant lights. Today, Yaorong Technology will show you what are the main spectral parameters of LED plant lights?


1. PPF value: The PPF of the lamp bead needs to be calculated by special software. The power of the LED plant lamp is determined based on the PPF value of the LED lamp bead. If the packaging company cannot provide the PPF value of the lamp bead, don't buy it if you encounter it. The person must be unqualified.


2. Radiant power: The radiant power is the main indicator that determines the performance of the LED plant lamp. The greater the radiant power, the higher the PPF value of the lamp beads, and the better the radiation performance of the LED plant lamp. The radiation power is also related to the chip area. The chip area is obtained by multiplying the length and width of the chip. The larger the chip area, the higher the radiation power.


The radiation power of LED lamp beads is determined by the radiation power level and price of the chip. The greater the radiation power of the chip, the more expensive the price.


3. Power consumption: The power level is divided according to the current specification. The larger the current specification, the higher the power the chip can withstand, but the greater the heat generation of the chip. Chips with different current specifications are packaged into different size specifications. The selection of different package specifications is based on the design requirements of the LED plant lamp structure. The low-power chip has high efficiency and low heat generation.


4. Radiation ratio: The relationship between the radiation amounts within the defined waveband is expressed in two ways.


Radiation content: the percentage of a certain waveband to the total radiation. The radiation content is the weight of a certain waveband to the total radiation.


Radiation ratio: the ratio between the two bands, the radiation ratio is the unit weight between each other, usually R: B and R: FR.


The radiation ratio is only effective for white light and rare earth process lamp beads, and there is no radiation ratio for monochromatic light.


5. Radiation efficiency


The radiation efficiency of the lamp beads = radiation power / power consumption * 100%, the radiation efficiency value is less than 100%. The radiation efficiency expresses the proportion of the radiation power generated by each watt of electricity consumed. The larger the radiation efficiency, the better. Radiation efficiency is limited by semiconductor material production technology, as well as packaging technology and heat dissipation technology. The main reasons affecting radiation efficiency are:


The impact of chip manufacturing quality: different production equipment and chip technology affect the radiation efficiency of the chip, and it is an effective way to choose a branded chip manufacturer.


Bracket material: At present, there are aluminum brackets, brass brackets, copper brackets, etc. on the market. Aluminum brackets are the cheapest, and copper brackets are the most expensive. Even the copper brackets, the quality of silver plating is different; packaging materials also include various fixing and filling The quality of the glue.


The quality of white light and rare earth process lamp beads is also affected by the quality of phosphors. High-quality phosphors have low light decay; white light phosphors are mainly divided into aluminates and silicates. The performance of aluminates is better than silicates and aluminum. The most representative of acid salt is YAG. YAG has stable performance and low light decay. The chemical stability of silicate itself is poor, but the brightness is higher than YAG.


Wire bonding material: Except for flip chip and CSP packaging, most of the lamp bead packaging uses gold wire bonding technology to connect the chip and the electrode of the bracket. At present, there are two types of alloy wire and pure gold wire on the market. Pure gold wire Preferably, the gold wire is divided into 0.7, 0.9, 1.0, 1.2, etc. according to the thickness. The thicker the gold wire, the lower the heat group and the longer the lamp life.


6. Voltage division specification: it is the voltage division of the chip, such as 3.0V-3.15V. For light sources connected in series and parallel, the voltage division is controlled within 0.15V, so that the current distribution of each string of light sources is uniform, which is beneficial to improve the light source Life.


7. Color temperature classification: For the color separation using white light beads, the packaging factory needs to provide the BIN code of the color temperature. The white light of the LED plant light has relatively less stringent requirements for color separation, and the use of color BIN can be appropriately relaxed.


8. MPF value: the measured value of photon flux with wavelength in the range of 380nm-800nm, unit umol/s, for monochromatic lamp beads, MPF=PPF, for lamp beads encapsulated with phosphor, the MPF value is greater than the PPF value, The parameter expression of the phosphor packaged lamp beads needs to be marked with the two parameters of MPF and PPF at the same time.


9. QE value: QE value is the PPF value per watt. It is a parameter derived from the spectral parameters of the LED plant lamp lamp beads. The unit is umol/J. This parameter is the comprehensive index of the LED plant lamp lamp beads and the most important performance. Comparing indicators, the QE value is a parameter that must be marked after the lamp bead spectrum is parameterized. The accuracy of the QE value relates to the technical level of the lamp bead's spectrum test, and measurement errors will cause the QE value to be distorted.


The spectrum of LED plant lights can be used as the induced lighting for the photoperiod and light morphology of plants. The specific wavelength and spectrum of LED plant growth lights can affect the flowering time, quality and duration of the flowering period of plants. LED plant lights of certain wavelengths and spectrums can increase the number of flower buds and flowering of plants; it can also reduce the flower formation response, regulate the length of the stalk and the flowering period, which is conducive to the production and marketing of cut flowers. It can be seen that the light spectrum of LED plant growth lights can regulate the flowering and subsequent growth of plants.


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