Description

grow lights beam out lots of different light wavelengths at your plants. However, your plants will only absorb some of these wavelengths to eat and grow bigger. The remaining wavelengths will reflect away from the plants, making them pretty much useless to your plant’s growth.

In general, more PAR = more growth and healthier plants.

Therefore, in general, you want to choose a grow light with a high PAR output so that your plants are getting as much usable light as possible.

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PAR is measured in two ways:

PPF = Photosynthetic Photon Flux –  This measures the light’s intensity by determining how many photons per second are emitted from the light. This is measured as micromoles per second (μmol/s).

PPFD = Photosynthetic Photon Flux Density – This measurement is even more important because it considers both the intensity of the light and the amount of that light that actually reaches the plant. It is measured as micromoles per square foot per second (μmol/m²/s)

If you want to measure the exact PAR output of your grow light, then you need to purchase a PAR meter.