led plant lights indoors Marijuana and other plants grow in usa
Marijuana and other plants grow led plant lights indoors in America（U.S.A）
cannabis，Marijuana Hemp cannabis sativa pot weed
cannabis，Marijuana Hemp cannabis sativa pot weed
Today, more and more growers no longer use traditional hid and T5 fluorescent lamps, but install LED lighting. Compared with HID light source, LED emits less heat, which means that the proximity of LED planting lamp and canopy is different from that of traditional planting lamp. It is also important to understand how the best growth distance affects different stages of plant growth.
According to the growth stage of plants, the different lighting requirements of various plants (including cannabis) are summarized. It also discussed how to determine the appropriate distance between LED lighting from plant canopy to the growth of nourishing plants, and the importance of PPFD (PAR) and other popular growth lamp terms.
How to measure the light used for plant growth
Let's quickly define par and PPFD. Par (photosynthetic effective radiation) describes the visible spectral part of the plant "seen" and used for photosynthesis (400nm-700nm). PPFD (photosynthetic photon flux density) measures the amount of light (PAR) plants receive over time. PPFD represents the light density received by plants over time, expressed as micromolecules per square meter per second.
One way to visualize PPFD is to imagine the sun "pouring" light onto the leaves of plants. When the sun shines on plants, their leaves are gathering energy. PPFD is a measurement of the amount of light (photons) that the sun "pours" over time to plants. PPFD is an important indicator because it can help growers accurately measure the light intensity of photosynthesis at the canopy level. This is also important because lights too close to the canopy can cause burning, fading, growth obstructed or discolored.
Table 1:LED distance between plant lamp and plant canopy (600W LED plant growth lamp)
* coverage will vary according to the growth lights used. The LED plant lamp shown here does not use a lens to guide the distribution of light.
Table 1 shows the performance of 600W LED growth lamps at different distances from plant canopy. It outlines the light intensity (Lux) provided by PPFD（ μ The "light footprint" or canopy coverage is also shown. Intensity, PPFD / par and "light footprint" all changed with the increase or decrease of the distance between light and plant canopy.
Table 1 also highlights how changing the distance of the same 600 Watt LED light changes the light intensity and "light footprint" or canopy coverage received by plants. When the light source is located closer to the crown, the light intensity will increase. Usually, for vegetative growth stage, the growth lamp should be installed near the plant canopy, while the flowering stage of plants should be higher (away from the plant crown).
|
LED植物灯距离 植物叶面高度(米/英寸) |
光照强度 (Lux) |
中心点PPFD / PAR (μmol/m-2/s-1) |
灯具辐射面积(m² / ft2)* |
| 2m / 79 inches | 955lx | 670 | 7.6m2 / 81.8ft2 |
| 1.5m / 59 inches | 1692lx | 1170 | 5.0 m2 / 53.8ft2 |
| 1m / 39 inches | 3663lx | 1670 | 3.0 m2 / 32.3ft2 |
| 0.5m / 20 inches | 12,500lx | 2170 | 1.5 m2 / 16.1ft2 |
| 0.2m / 8 inches | 50,300lx | 2670 | 0.5 m2 / 5.4ft2 |
Where should the growth lamp be placed?
For seedlings, LED growth lamps should normally be installed between 24-36 inches above the plant canopy, but this depends on the power of the light source (Watts). Place led planting lights at the furthest distance from the seedlings (~ 36 inches) - this keeps the heat and light intensity low and helps prevent the seedlings from drying. Once the root system is established and sprouting, the light can be moved closer (usually within the first 2-3 weeks).
During plant growth, led planting lights should be 12-24 inches from the top of the canopy. At this stage, photosynthesis requires more light, so the light source should be located near the plant.
With the plant entering flowering stage, the demand for strong light is reduced. The top leaf of the canopy shall be 18-24 inches from the light source to produce flowers. It is at this stage that the height of the plant increases and the fruit grows. Depending on the light and the way you want the crop to grow, you don't have to change the height of the light during flowering, especially if you don't want tall plants.
How far should led planting lamp be from seedling?
In the initial stage of growth, seedlings are fragile and require less light intensity. This means you don't want to increase intensity too early, because seedlings will grow in a more gentle way. Depending on the size of the light, the growing light can be safely maintained at a location between 24 and 36 inches from the top of the soil.
LED how far should a plant growth lamp be from plant cloning?
Marijuana cloning is a process in which the cuttings or cuttings of mature plants are used to plant another plant of the same species. The distance of led growth light above clone is different from the height required by seedling. For clones, they will need strong light to start. Depending on the intensity of light and maturity of the plant, the difference between 14-36 inches from the top of the canopy may be significant.
How far should LED plant growth lights be used?
As plants grow, their needs change. After the nutrition stage is completed, the plants enter the flowering or "flowering" stage. For mature factories, they have become necessary for vigorous development. During flowering, led planting lights should be 16-36 inches from the canopy. Moving the growth light closer increases the light intensity, thus maximizing photosynthesis. However, if the growth lamps are too close to the plants, they may lead to expansion, spread and even damage to plants.
What about other growth stages?
According to each stage of growth, plants need different levels of light. In order to know exactly how far the light should be grown, it is important to consider different stages of growth. It is also important to consider the power output of the growth lamp, which is usually related to the power of the light source, which is the main factor to determine the optimum distance of LED when starting the growth process.
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