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. , Unit (μmole/(m^2·sec).
Features:
1. The best spectrum is including 400-700nm full range wavelength energy. Especially some particular energy peaks,450nm and 660nm, also with another special peaks in vegetable/fruits/flower or chinese herb type of inner LED plant strip light.
