An abbreviation for photosynthetic photon flux density, PPFD is a measure of the number of photons in the 400-700nm range of the visible light spectrum (photosynthetic active radiation or PAR) that fall on a square meter of target area per second. Why do you need to know this? Any light manufacturer can brag about the vast amount of light a fixture produces. But if that light isn’t getting to the target (i.e., the plant canopy), all that light is wasted. You flip the switch on your light source and much of the generated light will hit its intended target. However, a percentage of the light photons never make it to the target due to optical losses. Lost light is lost dollars, because you’re burning energy to send light photons off in directions you don’t want them to go.
In this video, Illumitex Director of Research and Development Rebecca Knight explains what PPFD stands for and how it benefits plant growth.
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Rebecca Knight of Illumitex explains:
Video: What is PPFD?
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