The LI-190R 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 McCree showed that measuring PAR provided a consistent way to predict plant photosynthetic response regardless of the spectrum of the light source.
Absolute Calibration: ± 5% traceable to the U.S. National Institute of Standards and Technology (NIST)
Sensitivity: Typically 5 μA to 10 μA per 1,000 μmol s-1 m-2
Linearity: Maximum deviation of 1% up to 10,000 μmol s-1 m-2
Response Time: Less than 1μs (2 m cable terminated into a 604 Ohm load)
Temperature Dependence: ± 0.15% per °C maximum
Cosine Correction: Cosine corrected up to 82° angle of incidence
Azimuth: < ± 1% error over 360° at a 45° elevation
Tilt: No error induced from orientation
Operating Temperature Range: −40 °C to 65 °C
Relative Humidity Range: 0% to 100% RH, Non-Condensing
Detector: High stability silicon photovoltaic detector (blue enhanced)
Sensor Housing: Weatherproof anodized aluminum body with acrylic diffuser and stainless steel hardware; O-ring seal on the sensor base
Size: 2.36 cm diameter × 3.63 cm (0.93” × 1.43”)
Weight: 24 g head; 60 g base/cable (2 m) with screws
Cable Length: 2 m, 5 m, 15 m, 50 m (6.5’, 16.4’, 49.2’, 164’)
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