Intensity of LED plant growth lights
Intensity of LED plant growth lights

Intensity of LED plant growth lights

Whether you are new to LED growth lights or you have a certain understanding of LEDs, LED planting technology is the trend of future development. To use LED growth lights, you must learn the intensity of LED growth light. In terms of LED lighting indicators, even experienced HPS planters can come to understand.

In traditional HPS growth lamps, high wattage often means high intensity. You can refer to the formula for covering the wattage of the growing area, and then choose the lamp that suits you. However, LED plant growth lights are more complicated, the reason is very simple, because their light-emitting principles are completely different. For a detailed comparison of the two technologies, please refer to this article: LED growth lamp VS HPS, how do you choose?

intensity of LED plant growth lights

The meaning of LED growth light intensity

When we discuss light intensity, we are referring to the amount and intensity of light produced. One point we need to clarify is that watt is a unit of power, it does not mean intensity, it means the energy required by the lamp to operate. The grower believes that the wattage and the light intensity are proportional. In fact, this is a mistake, not all lights are like this. LEDs are not only more efficient than HPS lamps, but also have a wider range of light. Compared with HPS lamps of the same wattage, LEDs have a very high efficiency in converting electrical energy into light energy. HPS growth lamps convert a large part of electrical energy into heat. , So the light intensity of the LED grow light will be higher.

Indicators of LED growth light intensity

When you are comparing different LED lights, you should look for certain parameters. As we said before, the wattage has nothing to do with the intensity of the LED. Lumen refers to the visual brightness of the light. An important indicator to measure the intensity of LED plant growth lights is the PAR value.

PAR (photosynthetically active radiation)

When plant light grow light manufacturers produce and design LED lights, they usually indicate the specific parameters of the light in the specification.

Plants use only certain wavelengths of light for photosynthesis. These wavelengths fall within the visible light range of 400-700nm. As a grower, you should be concerned about the amount of light in the PAR range. Any light beyond 400-700nm cannot be used by plants. And for photosynthesis.

PAR is in micromole. Within a reasonable range, the higher the PAR value, the better the performance of the LED plant light, which is also one of the important indicators for selecting the plant light.

Why does plant light use different indicators from general lighting-lumens and PA value

In the traditional lighting field, lumens is a very important parameter unit. However, when it comes to growing lights, lumens cannot be used as its unit.

Lumen is a unit of measurement that represents the brightness of light in the human eye and is beneficial to light in the yellow, green, and orange spectrum, but plant growth uses more light in the blue and red spectrum for development, that is, High-lumen lamps are of little significance to your plants, and plant growth needs light from within the PAR range.

What is PAR

The photosynthetically active radiation covers the visible light range of 400-700nm. From the spectrum, it includes light of all wavelengths from blue to red. This measurement is expressed by identifying the number of photons emitted within the PAR range

PAR value of led plant growth light

For more inquiries about spectroscopy, please refer to this article: What is Grow Light Spectrum?

Why do we measure PAR per second

Although most lights always emit the same amount of light, there are usually some fluctuations in light quality, which is almost zero for LED plant growth lights, because advanced technology can maintain a more stable output. Here we introduce a new concept-PPF, the unit is umol/s, which means the number of photons emitted per second, which is similar to the speed unit m/s. By measuring the PPF, you can know that the indicator provided by the manufacturer represents the average PAR output, rather than intercepting the data at a certain moment. Generally, the higher the PPF, the stronger the light intensity and the better the quality of the plant light.