There are many reasons why LI-COR light measurement instruments are utilized worldwide. They have been designed and field proven to meet research demands in agriculture, oceanography and limnology, solar energy, industry, and the biological sciences.
LI-COR radiation sensors have been an industry standard for more than 30 years, with more than 100,000 light sensors sold. Experience, attention to detail, and an advanced knowledge of optical science are what separate LI-COR sensors from other alternatives.
LI-COR offers a variety of sensors for different applications. Each sensor can be used with the LI-250A Light Meter, LI-1400 Datalogger, or user-specified data logging device.
Terrestrial Quantum Sensors
TThe LI-190 Quantum Sensor
With the LI-190 Quantum Sensor, accurate measurements are obtained under all natural and artificial lighting conditions because of the computer-tailored spectral response. Colored glass filters are used to tailor the silicon photodiode response to the desired quantum response. An interference filter provides a sharp cutoff at 700 nm, which is critical for measurements under vegetation where the ratio of infrared to visible light may be high. A small response in the infrared region can cause an appreciable measurement error. This sensor, developed from earlier work (1), was pioneered by LI-COR and has become the standard for PPFD measurement in most photosynthesis-related studies.
For more information please refer to datasheet.
Terrestrial_Quantum
The LI-191 Line Quantum Sensor
The Line Quantum Sensor spatially averages PPFD over its one-meter 
length.
Measuring PAR within a plant canopy can be very difficult because of the non-uniformity of the light field. When PAR is measured with a small diameter quantum sensor such as the LI-190 Quantum Sensor, intensity can vary 10-fold between sunflecks and shadows, requiring a large number of readings to get an accurate average. The LI-191 Line quantum Sensor reduces the number of individual readings required because it effectively averages PPFD over its one-meter length. One person can quickly make plant canopy PPFD measurements in many plots in a short period of time.
For more information please refer to datasheet.
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Underwater PAR Measurement
LI-192
Underwater or atmospheric Photosynthetic Photon Flux Density (PPFD) can be accurately measured using the LI-192 Underwater Quantum Sensor. The LI-192 is cosine corrected and features corrosion resistant, rugged construction for use in freshwater or saltwater and pressures up to 800 psi (5500 kPa, 560 meters depth).
For more information please refer to datasheet.
Underwater_PAR_Measurement
LI-193
The LI-193 Underwater Spherical Quantum Sensor gives an added dimension to underwater PAR measurements as it measures photon flux from all directions. This measurement is referred to as Photosynthetic Photon Flux Fluence Rate (PPFFR) or Quantum Scalar Irradiance. This is important, for example, when studying phytoplankton, which utilize radiation from all directions for photosynthesis.
The LI-193 features a high sensitivity optical design and compact, rugged construction (3400 kPa, 350 meters depth, 3400 kPa = 493 psi).
For more information please refer to datasheet.
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Pyranometer
LI-200 Pyranometer
The LI-200 Pyranometer is designed for field measurement of global solar radiation in agricultural, meteorological, and solar energy studies. In clear, unobstructed daylight conditions, the LI-COR pyranometer compares favorably with first class thermopile-type pyranometers (1, 4), but is priced at a fraction of the cost.
For more information please refer to datasheet.
Pyranometer
Photometric
LI-210 Photometric Sensor
The LI-210 Photometric Sensor utilizes a filtered silicon photodiode to provide a spectral response that matches the CIE curve within ± 5% with most light sources. This photodiode and filter combination is placed within a fully cosine-corrected sensor head to provide the proper response to radiation at various angles of incidence.
For more information please refer to datasheet.
Photometric
