Hoe werkt mijn plant? - Het LED Warenhuis
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How does my plant work?

How does my plant work?

Photosynthesis in plants

We have been engaged in agriculture for several thousand years now and humanity has become increasingly wiser in that area. We've only really made a lot of progress in the last few centuries, want to know what we found out? Then read on!

The formulas

As early as the 17th century, scientists were working on understanding photosynthesis in the plant, but the basic formula was not known until the 18th century.
This formula reads:

Water + Carbon Dioxide + Sunlight -> Oxygen + Glucose

Photosynthesis is a process used by the plant to convert carbon dioxide into carbohydrates, such as glucose. The plant uses this glucose for energy by burning it. Due to this combustion, carbon dioxide is released and oxygen is consumed in addition to glucose. The process looks like this:

Glucose + oxygen --> water + carbon dioxide + energy

Combustion and photosynthesis at the same time

A plant in daylight or under one LED grow light is engaged in the combustion of Glucose but also in photosynthesis. There is a gas exchange of oxygen and carbon dioxide from both sides. at night or when the LED grow light off state, the plant is only engaged in combustion and uses oxygen and releases carbon dioxide.

Plants use more carbon dioxide during photosynthesis than they produce during combustion. At the same time, they produce more oxygen than they use during combustion. For this reason, plants and trees are the lungs of the earth.

Cells of a plant

The energy that is made can be stored in the plant, for example in the fruits. Among other things, this energy is released as soon as the plant is eaten. Photosynthesis is therefore very important for the nutritional value and taste of a plant. In the early stages of the plant, photosynthesis is essential for growth and branch formation.

The art of growing

The art of growing is to get the plant in the right cycle from photosynthesis to combustion. You can stimulate this by using the right light. A lot of research has already been done on this. We now know which colors plants use for photosynthesis. These are mainly the blue and red colors in the spectrum. These colors are in the Photosynthetic Active Radiation (PAR) range.

LED grow lights can well imitate these colors of the PAR area so that certain processes in a plant can be influenced. This includes photosynthesis but also other processes such as photomorphogenesis, Chlorophyll synthesis.


This process leads to the final shape, color and flowering of the plant. This is largely genetically determined, but is controlled by light.

Chlorophyll Synthesis:

Chlorophyll synthesis (leaf green synthesis) produces chlorophyll (leaf green), the green pigment in leaves and stems. The sunlight is captured and processed in the chloroplasts (green granules). Essential for photosynthesis!


For many plants, the length of the day (light period) is a source of information that determines when to form offshoots or to flower. The behavior and development of the plants are thus influenced by the photoperiod.

Blue Blue LEDs

Blue is important for the formation of chlorophyll, the development of chloroplasts, stomatal opening, the production of enzymes and the 24-hour cycle of photosynthesis and photomorphogenesis. Too much blue light affects the cell elongation of the plant, making the stems shorter and leaves thicker. This also works the other way around, but it is best to experiment with this.


Red is most efficient for photosynthesis and contributes to the production of chlorophyll and is important for photoperiodism and photomorphogenesis. Remove red light can ensure that the plant will form fewer side shoots, so that the plant will grow fewer branches (so also less leaves!) and therefore become higher instead of wider. Red light does reduce the formation of lint.

Red LEDs

Near infrared

This radiation with a wavelength of 700 - 3,000nm is little used by plants; this light is converted to heat. This can have a positive effect on the plant, but this differs per species.

Reddish radiation

This light is within the wavelength of 700-800nm ​​and is good for photomorphogenesis, stem elongation and photoperiodism of the plant.

Far infrared radiation

This light exists within the wavelengths 3,000 - 100,000nm and is mainly heat radiation as emitted by any hot object. This radiation is important for the greenhouse effect within greenhouses.

For more information on the scientific side of photosynthesis check out the Wiki page .


It is of course very difficult to combine all those types of light well, but fortunately these colors are used by manufacturers LED grow lights each have their own spectrum. Each manufacturer has also done its own research into this and tries to adjust its spectrum to the needs of the end user. We at Het Ledwarenhuis regularly receive feedback from our customers about, among other things, the spectrum. Based on that, we have selected these 4 brands: