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What is PPFD?

What is PPFD?

Before light can be effective in a photochemical reaction (whether photosynthetic or photomorphogenic), it must first be absorbed.

Photosynthetic Photon Flux Density (PPFD) is the measurement of PAR delivered to a specific area. It is expressed as micromole-per-meter squared-per second (μmol/m2/s).

This is the only measurement that informs us of the amount of light being delivered to a crop which enables photosynthesis.

Fluence SPYDR and VYPR systems are designed specifically for PPFD, not PPF.