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Definition:

PPFD is a value that explains how many photons in specific range(it’s from 400-700 nm for plant growth) of the visible light spectrum (photosynthetic active radiation or PAR) that fall on a square meter of  target area per second. The unit is  µmol/m2s.

(For more information about PPFD, please download SGAL)

Explain:

sgm_ppfd_01

PPFD Spectrum:Vertical axis is PPFD

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