How Does LED Grow Light Work?

LED grow light

Things You Need To Know About LED Grow Lights

Energy-efficient/power-saving LED grow lights are the lighting of the future of agriculture. They are not only economical in their use but they produce better plant growth as well, in comparison to all traditional lighting options. In the texts below you can read how the LED grow lights work, how they affect and encourage plant growth, and what advantages and extra value these LED lights have over the thus far most widely used artificial lighting in agriculture – HPS lamps.

LED grow light


What is LED and how it works?

In simple terms, LEDs (Light Emitting Diode) are small electronic components made of two different types of semiconductor material, one having a negative charge, called electrons, and the other having a positive charge, called holes. When voltage is correctly applied over an LED, an electric current starts to flow through it making electrons and holes start to collide releasing energy in the form of photons, light quanta, in a process called recombination. The first LEDs had relatively dim light output and limited selections of colors while modern LEDs have high brightness and come in varieties of colors in noticeable, infrared, and ultraviolet spectral ranges.

Samsung LEDs

What is LED grow lights?

As suggested by their name, LED grow lights are simply those lights that encourage the plant to grow in a similar natural environment with appropriate lighting conditions.

LED grow lights come in many shapes and sizes but as the most essential units of LED grow lights LED chips have most of the effect on the quality of the light, i.e. spectrum (colors) and photon flux (“brightness”) produced. Since LED grow light manufacturers can choose the LEDs they use in their lamps, it is crucial to understand which kind of LED grow light best fits the particular application. One of the advantages of LED grow lights compared to traditional lighting solutions is the ability to match the light to the needs of plants. Because a good lighting condition gives the appropriate atmosphere to grow.

 LED grow light

What is the overall effect of LED grow lights on plants?

Color variations of the LED grow lights are directly connected to the intended purpose – various studies have shown that certain colors influence plant growth, affecting root and flower formation (blue and red light spectra) which practically means that the majority of plant sorts will complete a normal growth cycle if exposed to both blue and red grow lights. Adding other colors to the spectrum, such as green, far-red, and deep-blue aids this process by giving plants more information about their environment and overall resulting in higher quality plants (quicker growth, more secondary metabolite accumulation, etc). A spectrum that contains all colors is called a full-spectrum and mostly resembles the sunlight. If it has high proportions of green, the light will appear white to human eyes, and while not a crucial factor for plant growth, it does make the workaround of these lights easier and makes a visual inspection of the plants possible.

 full spectrum LED grow light

Through research, we can determine what the optimal light for plant growth is. It is important to consider that various plants react differently to various light treatments (even different strains of the same plant). Additionally, a plant in its flowering phase may require a different light treatment as opposed to when it is in the vegetative stage. When it comes to the light itself, several limits can be adapted:

  • Light spectrum(the combination of colors used to produce the light)
  • Light intensity(typically measured in micromoles, the number of photons projected onto the plants)
  • Photoperiod(number of hours a plant is exposed to light within 24 hours)
  • Light uniformity(the degree to which the light is equally distributed across the canopy)


In other words, LED grow lights users need to exercise a tailor-made approach when raising crops because each plant species has different needs. In practical terms, this means conducting trials before going to large-scale production. 

A substitute to that is purchasing the LED grow lights from companies that are dedicated to research and provide this data to their customers.

Discover Radical Advantages of LED Plant Grow Lights

During the initial stages, LED technology was apparent as rather unreasonable and cost-inefficient. With the newest technology advances LED grow lights production has become cost-effective. Additionally, the range of available LED chip types facilitated the development of a more efficient plant cultivation industry. When set side-by-side with the outdated HPS (high-pressure-sodium) systems, LEDs lead in terms of energy efficiency, the quality of plants cultivated as well as environmental friendliness.


LEDs are simple but powerful, energy-efficient plant growth lamps in comparison to the mainly used HPS lights that are gradually being perceived as large yet less robust. HPS lamps have a shorter life span which makes them more expensive in the long run. The heat emitted by HPS lamps is sometimes good and effective in greenhouse settings but makes them practically useless for vertical farms or growth chambers. LEDs are faster switching, more compact (smaller in size), and are perceived as more beneficial for the environment. Also, LED grow lights release less incandescent heat which affects the moisture and nutrition requirements of plants. The minor amount of heat that is emitted is emitted upwards and away from plants unlike with HPS where the heat goes directly onto them increasing the leaf surface temperature and sometimes burning the plants.

In essence, the revolutionary advantages of LEDs in comparison to the conventional HPS lights are:

HPS compared with LED grow light


  • Financial electricity consumption –  LED grow lights utilize up 50% of the energy that HPS systems use and some experts anticipate even a higher LEDs efficiency shortly.
  • Longer lifespan/lamp durability – LEDs have a longer life span in comparison to the HPS lights; for the comparison’s sake, the HPS lamps can last for 1 year while the LEDs might last even up to 8 years (which translates into 50 000 hours of use).
  • Smaller spaces convenience– as the LED grow lamps can be set closer to the plants,  the growing space does not need to be extremely high or wide.
  • Energy efficiency/ power saver– with LED grow lights it is possible to optimize the spectrum by concentrating energy on wavelengths (colors) that are most beneficial for each application and plant. Also, reduced heat production allows putting LED fixtures closer to plants ensuring less light is lost elsewhere.
  • Fire safety– as LEDs do not become very warm in comparison to the conventional HPS lamps they are safer to use even after many hours of use.
  • Dimming – while the majority of HPS lamps use the full light intensity, LED grow lights can dim even with a remote control or via an app and therefore are easier to handle, apart from intense less power.
  • Healthier crops– various trials have shown that LED grow lights produce better crops in terms of plants getting bigger and growing faster, compared to the HPS lights. Additionally, LEDs can be made with a spectrum aimed at a specific goal such as anthocyanin accumulation, flowering inhibition, enhanced rooting, etc.
  • Environment safety– since less heat is emitted and that UV light can be added to LED lamps, there is less chance for bacteria and mold formation which subsequently means fewer pesticides and less environmental pollution.
Previous post Next post