LED plant lights efficiently and uniformly focus light on plants

10 min read

LED plant lights efficiently and uniformly focus light on plants

How to achieve efficient and uniform lighting of LED plant lights on plants? It is said that LED plant lights are efficient and energy-saving plant growth lights. Part of the reason is that the electro-optical conversion efficiency of LED lamps is much higher than that of traditional lamps such as incandescent lamps and sodium lamps. It is also because LED plant lamps can customize the spectrum. However, in order to use LEDs for maximum efficiency Grow lights, or what measures can be taken?

1. LED plant lamp bead distribution

LED plant lights are used to illuminate plant lights, and their purpose is to make the growth of plants reach the ideal state of the lamp user. Crop growers hope that their crops can grow lush and balanced, and the uniform distribution of LED plant lamp beads is exactly the same. Ensure that its light energy is evenly irradiated on the unit area. Considering the distribution of lamp beads, the most important thing is that a single uniformly distributed LED plant lamp has a large illumination area, and its lamp beads are mainly composed of red and blue lamp beads. If the positions of lamp beads with different spectra are not reasonably distributed, It will definitely lead to considerable differences in the growth status of plants in multiple areas within the range of LED grow lights. This is the meaning of using LED grow lights.

The distribution of LED plant lamp beads is intuitively important. If 12 blue lamp beads are arranged in one row and 84 red lamp beads are arranged in seven rows, what kind of lighting effect will it have?

2. Use of physical optical equipment

The physical principles used by LED grow lights in enhancing illumination and adjusting illumination uniformity are mainly light reflection and light refraction. LED grow lights use the reflection of light to increase illumination and illumination uniformity. They mainly use reflective cups and metal substrates used in COB. The principle of LED grow light reflector cups is the same as the flashlights we have used, reflecting the light emitted by the light source into a beam. , increase the local light intensity. The difference is that the angle of light reflected by the LED plant lamp reflector will be larger than that of the flashlight reflector, and the angle is designed through precise calculation to ensure the light intensity and illumination uniformity within its irradiation range.

The reflective effect of the metal substrate is also to maximize the use of the light energy emitted by the LED plant lamp beads by the plants. The main reflected part is the auxiliary light, not the main beam. Of course, its function is not only to reflect light, but also to fix lamp beads and dissipate heat. LED plant lights use the principle of refraction of light to increase illumination and illumination uniformity. They mainly use optical lenses to change the propagation trajectory of light. The principle is to use light to propagate from gas to solid, and then through the solid back to the gas. Directional changes will occur. Change, generally use single lens and retest lens, which can control the illumination and distribution very accurately.

The advantage of LED grow lights over traditional plant growth lights is not only a matter of light efficiency and environmental protection, because they are small in size, generate little heat, and also have considerable advantages in convenient dimming processing.Visit https://www.mobilegrowsystem.com to see more indoor farming equipments.

Light is a kind of electromagnetic radiation. The light that the human eye can see is called visible light, which is between 380nm and 780nm, and the light color ranges from purple to red. Invisible light includes ultraviolet light and infrared light. Photometric and colorimetric units are used to measure the properties of light. Light has both quantitative and qualitative attributes.

The former is light intensity and photoperiod, and the latter is light quality and light harmonic energy distribution. Light has particle properties and wave properties, that is, wave-particle duality. Light has visual properties and energy properties. Basic measurement methods in photometry and colorimetry. ① Luminous flux, the unit is lumens lm, refers to the sum of the amount of light emitted by the luminous body and the light source per unit time, which is the luminous flux. ②Light intensity: Symbol 1, unit candela cd, the luminous flux emitted by the luminous body and the light source within a single solid angle in a specific direction. ③Illumination: The symbol is E, the unit is lux lm/m2, the luminous flux illuminated by the luminous body on the unit area of the illuminated object. ④Brightness: The symbol is L, the unit is Nitr, cd/m2, the luminous flux of the luminous body in the unit solid angle unit area in a specific direction. ⑤ Luminous efficiency: The unit is lumens per watt, lm/W. An electric light source is the ability to convert electrical energy into light, expressed by dividing the emitted luminous flux by the power consumption. ⑥Lamp efficiency: Also called light output coefficient, it is the most important criterion for measuring the energy efficiency of a lamp. It is the ratio between the light energy output by the lamp and the light energy output by the light source inside the lamp. ⑦Average life span: The unit is hours, which refers to the number of hours when 50% of a batch of bulbs are damaged. ⑧Economic life: The unit is hours. Taking into account the damage of the lamp and the attenuation of the beam output, the comprehensive beam output is reduced to a specific number of hours. This ratio is 70% for outdoor light sources and 80% for indoor light sources such as fluorescent lamps. ⑨ Color temperature: When the color of the light emitted by the light source is the same as the color of the light radiated by the black body at a certain temperature, the temperature of the black body is called the color temperature of the light source. The color temperature of the light source is different, and the light color is also different. The color temperature below 3300K has a stable atmosphere and a warm feeling; the color temperature is between 3000 and 5000K, which is the middle color temperature and has a very refreshing feeling; the color temperature above 5000K has a cold feeling. ⑩Color temperature and color rendering: The color rendering of a light source is expressed by the color rendering index, which indicates that the deviation of the color of an object under light compared to the color of the reference light (sunlight) can more fully reflect the color characteristics of the light source.

There are two types of color rendering: faithful color rendering, which can accurately express the original color of the substance, requires the use of a light source with a high color rendering index (Ra), the value is close to 100, and the color rendering is very good; the color rendering effect is very clear, and it must be vivid To emphasize specific colors and express beautiful life, you can use the additive color method to enhance the color rendering effect. Since the spectral composition of light is different, even if the light color is the same, the color rendering properties of the lamps may be different.

Vision is a person's understanding of the outside world through the perception of light produced by radiation such as the human eye. Spectral optical efficiency is an evaluation of the sensitivity of the human eye to different spectra of visible light, and its value is between 0-1. The human eye has the highest sensitivity to yellow-green light with a wavelength of 555nm, while the sensitivity to light of other wavelengths is lower and shows a normal distribution curve.

Illumination is the luminous flux per unit area determined based on the human visual spectrum light effect. It is usually defined as 555nm yellow-green light as 1, and the unit is 1x (lux). Photosynthetically active radiation illuminance refers to the photosynthetically active radiation energy irradiated per unit time and unit area, and the unit is W/m2.

In agricultural semiconductor lighting, light quantum flux (density) is usually used to measure light intensity. Photosynthetically active radiation (PAR) is visible light radiation in the 400-700nm band. Physiologically active radiation is radiation of a specific wavelength that can contribute to plant growth and development. The wavelength is usually 300-800nm. The non-photosynthetically active radiation range of physiologically effective radiation is close to ultraviolet radiation and far-red radiation, which directly affects the photomorphogenesis of plants and the production of secondary metabolites. Photosynthetically active photon flux is PPF, which is the photon flux used by plants for photosynthesis, that is, the number of photons in the wavelength range of 400 to 700nm, and the unit is umoL/s. Photosynthetically active photon flux density (PPFD) is the number of photosynthetically active radiation photons irradiated per unit time and unit area, and the unit is umoL/m2·s. In the context of plant physiology, the number of photons is usually expressed in micromoles (umol). Spectral energy distributions such as illuminance, irradiance, and photon flux density are closely related, but there is no fixed conversion relationship between them. The coefficient for converting 1000lx of a common light source into umol/m2·s is 12~19. The sunlight source during the day is 1klx=18Hmol/m2·s, and the fluorescent lamp is 1klx=12.5umol/m2·s.

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Henry Liu 2
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