If you were to double your PPFD from 400 to 800, the growth rate potential reaches about 85%. Between 200 PPFD and 400 PPFD, plants growth rate potential crawls around 30 - 55% which is recommended for mother plants or young, weaker plants that need a light that's not super intense. Between 600-900 PPFD: This is great for the flowering, fruiting, or budding stage of plants.
Between 400-600 PPFD: This is great for early to late stage vegging cycles. So let’s talk benchmarks and the best PPFD/PAR range for your plants! Between 200-400 PPFD: This is great for seedlings, clones, and mother plants. PPFD, or Photosynthetic Photon Flux Density, is a measurement of light density in a given area. PPFD Measurements and What's Best for Your Plants As we've mentioned, PAR is the type of energy plants use from light and PPF is a way to measure light efficiency or intensity. You may have great PAR readings directly under a grow light, but if your PAR output drops dramatically from moving only 2 feet away from the center of your grow area, then you might want to consider upgrading your grow light. Light Coverage and Spread PAR output for grow lights is best when the output is spread evenly in your grow area. We should note that while most plants need a blend of all of these wavelengths to grow properly, targeting specific wavelengths isn't necessarily a bad thing, as is the case in supplemental LED's. While a given light may have high PAR readings, it may not necessarily have the wavelengths of light you need to grow a successful, harvest-ready plant. Visible light is a mix of different reds, blues, greens, oranges, and yellow wavelengths. PAR meters measure the intensity of light but it does not tell us the quality of the spectrum that light produces. What's most important is making sure the quality of spectrum your light gives off is the best one for your plants, and that your grow light has a nice, even spread across your canopy. So that means the more intense PAR a light has the better it is, right? Yes! Well, sort of. To use our rain analogy, a PAR reading will be the measurement of rainfall on the ground it covers. A PAR reading will tell you how much light energy/intensity a grow light has at different points over a given growing area. Plants will use that light to help break down the water and nutrients they suck up from their roots and turn it into carbohydrates, or energy, to grow big and strong. When it comes to grow lighting, you don't want a drizzle, you want a full-on storm! Most plants that are cultivated for consumption require light to grow. Okay, so what's the connection between PAR and a grow light source? To demonstrate this idea, imagine your grow light as a cloud and the light coming out of it is rain. The Sun System PAR Meter measures the visible light spectrum, which is between 400-700nm wavelengths. In other words, we are measuring the intensity of light being emitted from your light source that plants use to photosynthesize.
When we use a PAR meter to test how well light fixtures emit PAR, we are measuring how many photons of light hit our sensor per second. PPF stands for Photosynthetic Photon Flux, which means how many photons of light per second make contact with your plants. So if PAR is just a term that describes the type of light that plants absorb, how do you measure it? You measure PAR with a PPF meter (aka "PAR meter") Just like the difference between a growing area and a canopy, PAR is not the measure of all of the light a grow light gives off, but the measurement of the wavelengths plants will absorb. PAR is the amount of light that’s usable to plants- those wavelengths that will be used for photosynthesis. So what does that have to do with PAR? Some people think PAR is a measurement of all the light coming from a light source.
The rest of those wavelengths are reflected from the plants. However, plants will only absorb some of those wavelengths and use them to eat. In simple terms: grow lights (that mimic the light of the sun) gives off tons of wavelengths (colors) of light when it shines. The usable light that plants can absorb is used for photosynthesis. What does that mean? Well, let's break it down: In scientific terms, light has properties of both photons and waves and in the spectrum of visible light. PAR stands for Photosynthetic Active Radiation.
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