Light for plants


LED lighting

Why is light the most important environmental factor in plant growth? Plants use light rays as the main source of energy for their growth in the process of photosynthesis. The influence of light is also important for a number of other processes that take place throughout the plant's life cycle, from germination to vegetative development, during which shoot elongation and leaves are expanding through the generative development that affects flowering and fruiting up to the aging of plants.

The best growth results can be achieved by using plant growth acceleration lamps (LED greenhouse lamps), which cause a significant and faster crop growth compared to the use of traditional high pressure sodium lamps.

By using high-quality LED lamps, we have a guarantee to achieve maximum harvesting results.

Increase your harvest

by using extra lighting in LED technology.

The main factor limiting the yield of tomato crops under cover is the amount of light that reaches the plants. The light affects directly the amount of yields obtained. Increasing its amount by 1% (as long as the other factors are optimal) increases the yield by 1%.

Central European countries such as Holland, Belgium, Germany or Poland are located in a moderate climate zone characterized by a deficit of natural sunlight in autumn, winter and early spring. Therefore, artificial light sources for plants’ lighting has been used for many years, although it is significant expensive of greenhouse production. The total cost of crop production under cover constitute a major part of expenses on heat and electricity. In addition, most of the energy consumed in greenhouse crops is still derived from the burning of fossil fuels, which has a negative impact on the environment. Thus, new lighting technologies that may reduce energy consumption and still enable to increase the value of the crop are increasingly placed at the center of plant producers' interest.

As of today, high pressure sodium (HPS) is the most commonly used lamp in horticultural produce. It is characterized by high luminous efficiency but does not guarantee a relatively long service life. In practice, such light sources are usually replaced every 1.5 - 2 years. In addition, unfavorable economic conditions (high prices of energy) significantly limit the introduction of these lamps into a wide production range. It should also be highlighted that the light spectrum applied in these lamps is determined by their construction and it is difficult to modify. Moreover, HPS lamps emit large amounts of heat, which, when used inappropriately, can cause thermal damage to cultivated plants.

At present more and more widespread use in practical lighting solutions are semiconductor light sources (LED – light-emitting diode). The advantage of this solution over other artificial light sources is the ability to optimize the radiation spectrum of LED modules easily. The use of LEDs allows to construct lighting housings of any spectral characteristics (by integrating appropriate proportions of radiation of different colors) that can be adopted to the needs of the plant species. Other advantages of using them are: smaller size of single light source, high durability and reliability, better illumination efficiency and minimal heat emission. In Europe among the vegetables grown under cover, the tomato is ranked in the first group of vegetables in respect of the area occupied. Tomato is a plant with high thermal and light requirements. Growing under low light conditions causes poor growth, delays the production of flower clusters, and limits flowering and fruit setting. The quality of the planting material is an important factor in the correct growth and high yielding of plants. Obtaining proper tomato seedling requires both maintaining optimum growth temperature and ensuring good light conditions. It is important to keep in mind that the availability of light is usually much lower than the required when preparing the seedling in winter and early spring. On cloudy days in November and December the irradiation intensity may be as low as 40-50 μmol / m2 / s1, while the minimum level required for proper photosynthesis is about 80-100 μmol / m2 / s1. It is also noteworthy that the autumn and winter days are very short, so the total amount of light energy reaching the plants per day is small. It is therefore necessary to replenish daylight with artificial light, which in turn is intended to accelerate growth and increase plant yield.

The text of the research work of the Electrotechnical Institute in Warsaw was used
"Influence of sodium lamp and LED lighting on photo-synthetic activity and growth of tomato plants"



Light and other

factors in greenhouse crops

The growth and yielding of tomatoes among other things depends on the environmental conditions, i.e. insolation (duration of sunlight), temperature, humidity, substrate and nutrient solution, and their mutual interaction in different conditions.

Light is a key external factor for which the grower has the least influence, especially if he does not light up his crops with an additional artificial light source. Then the crop is solely dependent on the intensity of natural sunlight.

Proper lighting of crops always has a significant impact on other external factors which is  essential for the proper development of greenhouse plants.

vs light...

Temperatura, a światło

The air temperature should be adapted to the light conditions and plant growth phases. The temperature is regulated differently when seedling the plant, and differently after the first cluster appears and in the further stages of its development. Differentiation of temperature for tomato is closely correlated with access to light and its intensification. LED lamps, due to their unique structural properties, on the one hand allow to provide the optimal spectrum of light that in a certain growth phase seedling needs, and at the same time through low heat emission factor do not negatively affect the temperature fluctuations in the greenhouse, which still remain under full grower's control.

vs light...

Wilgotność, a światło

Significant variations in air humidity result in growth disturbances and fruit cracking. As the humidity increases, there is a faster opening of the stomata, which on the one hand causes a better growth of plants, while on the other hand it can promote the development of diseases. Low humidity leads to inhibition of calcium and boron intake, while high (over 90%) condensation causes water vapor condensation. Closing the vents in hot weather for increased humidity, initially reduces transpiration, then increases the temperature, which increases the deficit of water vapor and increases the transpiration.
Undoubtedly, the use of LED technology in the lighting of crops, also favorably affects the maintenance of the level of humidity in the greenhouse at the appropriate level, because it does not dry the plants as much as it does when using other light sources that emit a large dose of heat to the environment.

vs light...

Pożywka, a światło
Proper nutrition of plants depends on the amount and concentration of ingredients in the dosing solution and the substrate. It is very important to determine what ingredients and at what time plants need the most, so it is necessary to adjust the fertilization to the requirements of individual phases of plant growth.
The basis for proper nutrition of plants is irrigation with nutrient solution (mineral salts) with the appropriate concentration measured by specific conductivity determined as EC expressed in mS/cm. During the preparation of the seedling, the concentration of ingredients in the nutrient solution should be adjusted first of all to the light conditions and the balance of vegetative to generative growth. Even a short-term reduction in the intensity of light requires an increase in concentration (in the absence of light EC factor must be higher from 0.2 to 0.3 mS/cm). To reduce the vegetative growth, EC is increased and reduced at excessive generative development.
By providing the right dose of the optimal light spectrum, we stabilize the concentration of nutrient components in the dosing fertilizer solution.