When we talk about led grow light, we may think about some key metrics of measuring, such as PAR, PPE, PPFD. Today, let’s know more about them and find out what is the better way to measure.

Photosynthetically active radiation, also known as PAR, light is the wavelengths of light that plants use in photosynthesis. These are the wavelengths of light from 400 to 700 nanometers (nm). This spectral range is close to the range of light that the human eye can see.  PAR is not a measurement but the type of light that plants need to grow. To compare LED lights, the three most important things to look at are PPFD (photosynthetic pfd), PPF (photosynthetic photon flux), and PPF Efficacy (photosynthetic photon flux efficacy). PPF is a way to determine how much PAR is emitted from a lighting fixture every second. It is measured in micromoles per second (mol/s).

Light intensity, or PPFD, is a measurement of the amount of PAR that reaches a specific spot on your plant canopy. It's measured in micromoles per square metre per second, which is how much PAR reaches that spot.

PPFD can make plants grow faster. What is the best way to figure out how evenly the light spreads across a certain area? The rule of thumb for horticulturalists is that getting more light means getting more yield for most crops. Hemp plants usually follow this simple rule of thumb. However, there is a point where the rate at which they grow slows down.

Growers use a PAR metre to measure the average PPFD. They then multiply the average PPFD value by the area they measure to get the PPF value. After that, the PPE value is found by dividing the PPF value by the amount of power used.

It starts with the PPE value. It's hard to get the value right because of things like diffuse reflections and overlaps, so it can only be done in an integrating sphere to get it right. As a result, the PPE that is found this way is wrong.

PPE only looks at how an LED grow light converts electricity into light. That means that PPE can't tell you how well the light fixture spreads out to a canopy. You don't get a measurement of how much light is spread out over a certain amount of canopy space with PPFD. Instead, it tells you how much light is coming into your canopy area per second. This is what growers care about the most because it shows how the real energy from the sun goes to the plants.

People who grow plants with LED lights should look at their lights' PPFD value because it's more accurate to figure out how well they work. It's also a good idea to look at the PPFD maps of any LEDs that you want to buy. Be careful not to be fooled by only having a high PPE score. Below is the real testing PPFD chart from LONG SUN LED.

If any request, kindly contact us for the right answer.