LI-190R

Quantum Sensor

The LI-190R Quantum Sensor measures Photosynthetically Active Radiation (PAR, in µmol of photons m-2 s-1). It provides accurate measurements—in the open, in greenhouses, under plant canopies, or in growth chambers—for most broad-spectrum light sources, including natural sunlight, artificial, or mixed sources.

Plants use light in the wavelength range from about 400 to 700 nm to drive photosynthesis. The efficiency with which plants use light varies somewhat across this range, but McCree1 showed that measuring PAR provided a consistent way to predict plant photosynthetic response regardless of the spectrum of the light source.

  • Uniform sensitivity across the PAR waveband for accurate measurements outdoors, under vegetation, or in artificial lighting without changing the calibration
  • Newly designed optical filter tailors the spectral response to an unprecedented performance standard
  • Weather resistant and durable in high-temperature, high-humidity, long-term deployments
  • Cosine correction is accurate even when the light source is not directly overhead
  • Sensor heads are detachable and interchangeable for simplified installation, removal, and recalibration

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