What is the PPFD relative with growth light and how much for cannabis?
With the legalization of marijuana cultivation in many countries, many people are growing marijuana in exchange for benefits. However, outdoor marijuana cultivation is very limited, not only because of the impact of weather and season, but also because of the bad environment and short growing cycle. Therefore, indoor marijuana cultivation is very popular with the majority of growers. When you grow marijuana, you also need to know two other phrases related to photosynthetic effective radiation (PAR). These stages are photosynthetic photon flux density (PPFD) and micromolar（ μ mols）。
PPFD is the number of photons hitting the surface (plant canopy) in one second. It is called micromolar（ μ Measured in moles). Simply put, this is the intensity of light reaching your plant. Light loses intensity as it travels from the source to the endpoint (from growing light to plants). You’ll notice that in most growing light intensity charts, the number of PPFDs decreases as the distance from the grow light increases. That’s why it’s important to pay attention to the hanging height of your led plant grow lights when growing marijuana.
So when growing marijuana, understand how much light marijuana plants need during seedlings, vegetables and flowering?
Cannabis seedlings need only 200-300 PPFD per second in the first three weeks of life.
In order to provide 20 moles of light to your plant every day, your grow light needs to apply 308 microliters of light to your canopy every second for 18 hours in the cannabis plant (veg) phase.
During the flowering period of cannabis, the grow light needs 462 microliters per second for 12 hours to reach 20 moles of light per day.
If you want to increase the amount of light per day from 20 moles to 40 moles to achieve higher yield, you only need to increase the amount of light from 308 PPFD to 616 PPFD during the vegetative period and from 463 PPFD to 925 PPFD during the flowering period.
The LED grow lights on the market are both full spectrum and dimming. Compared with the HID series grow lights in the past, LED plant grow light only need to adjust the height of LED grow lights in different growing periods for growers, so it is not necessary to replace plant grow lights again.
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