How Much PPFD Does Indoor Cannabis Growth Need During Seedling, Veg and Flowering ?

Trend of growing plants using LED grow lights is increasing day by day .

To understand the science behind growing plants using led grow light you need to understand how plants see the light?

PPF and PPFD are both acronyms that deal with the amount of light for a light source or location:

PPF – photosynthetic photon flux

PPFD – photosynthetic photon flux density

PPF and PPFD measure the quantity of such photons. The critical difference is that PPFD measures the density of these photons falling on a particular surface, while PPF is a measure of the total number of photons released from a light source

Cannabis seedlings require only 200-300 PPFD per second during the first three weeks of life.

To deliver 20 moles of light per day to your plants, your grow light will need to put 308 umol per second on your canopy for 18 hours straight during the cannabis vegetative (veg) phase.

During the cannabis flowering phase, the grow light will need to deliver 462 umol per second for 12 hours straight in order to achieve 20 moles of light per day.

If you want to increase the amount of light from 20 to 40 moles per day, resulting in higher yields, you simply need to double the numbers above – 308 PPFD to 616 PPFD during the vegetative phase, and 463 PPFD to 925 PPFD during the flowering phase.

The following is the reference figure for different plants;

The LED grow lights on the market are all full-spectrum. You only need to adjust the height of the LED grow light at different planting periods