PAR Meter是量測400~700nm波長範圍內的光[照度計] 光合有效波段400~700nm
Light (or photons) in the wavelengths of 400 to 700 nanometers (nm) is the energy source for photosynthesis and is called Photosynthetically Active Radiation (PAR) or Quantum, and is usually expressed in Photosynthetic Photon Flux (PPF).