Cannabis Grow Lamps
The number of countries where marijuana is legalized is increasing every year, in this regard, the sale of cannabis seeds contributes to the emergence of a new hobby – the cultivation of marijuana. But despite the unpretentiousness of this plant, you need to know how to care for it. Below we will talk about lamps for growing cannabis indoors, because no plant can survive without light. Even if you put the plant on a windowsill or balcony, then the sunlight will not be enough for it to reveal its potential. We’ll have to use hemp lamps. But anyway, what kind of lamps will not work. Cannabis needs them to emit the spectra of light it needs to develop.
What kind of light does hemp need
The main spectra of light for cannabis are red and blue. Auxiliary can be called ultraviolet and infrared radiation. Power is also very important. It is best to aim for 600 watts per square meter. m of cultivation area, but when growing several small plants or autoflowering hemp varieties, 150-250 watts will be enough. As for the luminous flux indicator, the HPS indicator, which give a minimum of 90 lm / W, has long been considered the gold standard. The most efficient ones give out 150 lm / W or more. Modern LED luminaires are also practically not inferior to HPS lamps and produce more than 100 lm / W. The luminous flux index within these limits will be quite enough for any kind of marijuana.
Light spectra for the growth stages of marijuana
Its wavelength is the shortest and ranges between 280 and 400 nm. Ultraviolet radiation comes in two varieties: UV-A (315-400 nm) and UV-B (280-315 nm). At the moment, the effect of ultraviolet radiation on plants has not been fully studied, however, there are still certain studies in this area. For the most part, UV-A is too negative for plant development, so it is not recommended for use in crop production. A moderate amount of UV-B, which is closer to the blue spectrum, stimulates the production of resin in the plant, which helps it become more resistant to negative environmental factors. Also, the increased resin content has a positive effect on the quality of the hemp crop.
This spectrum is used most often in the late stage of flowering, although in nature, ultraviolet light affects plants throughout their life, improving the functions of protective mechanisms and the production of resinous compounds. Luminaires of low power can be used as constant supplementary lighting or periodically switched on for a short time several times a day. The UV spectrum is present in many types of lamps, for example, in cold ECL (therefore they are sometimes used as supplemental light during the flowering stage). It is also often added to full spectrum LED luminaires.
It includes light with a wavelength of 430 to 470 nm. This light is especially necessary for cannabis during the growing season, as well as in the first weeks of flowering, which is also called pre-flowering. Blue light stimulates the production of chlorophyll B, which is responsible for the development of roots, leaves and shoots. The process of photosynthesis is improved, which is especially important at the stage of germination and vegetation. This promotes more intensive branching and the formation of more ovaries of inflorescences, the plants stretch less. Lamps of the blue spectrum are of many varieties, among them: ESL, MGL, DNaT, LED.
This spectrum is characterized by wavelengths from 500 to 600 nm (between blue and red). Until now, many growers have ignored the importance of this spectrum. This is mainly due to the fact that green light does not have a significant effect on the intensity of the photosynthesis process, but a large number of other important processes take place in the plant. The green spectrum promotes optimal plant development and is partially represented in many lighting devices (HPS, MGL, ESL, LED.) It has a good effect on metabolism, improves the absorption of nutrients, carbon dioxide and water. Green light ensures the correct smooth transition to the flowering stage, gives intensity in the mass gain and the formation of inflorescences.
The most effective is the joint use of the green spectrum with red and blue. Another important feature of the green spectrum is the possibility of using it at night to work in a greenhouse; plants do not perceive this light as “daylight” since it does not activate the process of photosynthesis.
Its wavelength ranges between 620 and 700 nm. It is necessary for the growing plant during the cannabis flowering stage. With its help, the plant is able to produce and store the most energy, food is better absorbed. As a consequence, the production of chlorophyll A increases, which is needed for the formation of strong roots, bud formation, and maintenance of the flowering process. Warm ECL, MGL, DNaT and LEDs have a red spectrum.
IR radiation (far red spectrum)
The wavelength range of this radiation is between 730 nm and 30 µm. This light is able to accelerate the metabolic process inside the plant, which has a positive effect on its development rate. The far red spectrum of light is especially needed in the morning and evening hours, at which time it is most emitted by the sun in the wild. Infrared radiation gives the plant a signal of the beginning or end of the day, with its help the plant quickly rebuilds from day to night and vice versa, starting or vice versa slowing down certain processes.
Advice! It is worth paying attention to the fact that with a sharp premature change of the spectrum to warm, the bushes can grow too high, which is not always convenient, especially in a confined space. It is desirable to change the spectral composition of the radiation gradually, so that the plants will not stall in growth, adapting to new conditions. The best results are unambiguously obtained by using different spectra throughout the entire life cycle, but in different proportions. As it happens in nature, it is also best indoors.