LEEF Light Package
The LEEF Light Package is designed for students to make light measurements with both terrestrial and underwater sensors. When sensors are connected to the LI-1400 Datalogger, data can be logged at predetermined time intervals. Instantaneous readings can be made by connecting a sensor to the LI-250A Light Meter.
The LEEF Light Package Includes Three Types of Light Sensors
- LI-190SA Quantum (PAR) Sensor: Used for terrestrial measurements. During photosynthesis, plants use energy in the region of the electromagnetic spectrum from 400-700 nm. The radiation in this range, referred to as Photosynthetically Active Radiation (PAR), is typically measured as Photosynthetic Photon Flux Density (PPFD), which has units of quanta (photons) per unit time per unit surface area. The units most commonly used are micromoles of quanta per second per square meter (µmol s-1 m-2). Plant scientists, horticulturists, ecologists, and other environmental scientists use the LI-190 Quantum Sensor to accurately measure this variable.
- LI-200SA Pyranometer: Used for terrestrial measurements. It is designed for field measurement of global solar radiation in agricultural, meteorological, and solar energy studies. The spectral response of the LI-200SA does not include the entire solar spectrum, so it must be used in the same lighting conditions as those under which it was calibrated. Therefore, the LI-200 should only be used to measure unobstructed daylight. It should not be used under vegetation, artificial lights, in a greenhouse, or for reflected solar radiation.
- LI-192SA Underwater Quantum (PAR) Sensor: Used for both underwater and terrestrial measurements. It features corrosion resistant, rugged construction for use in freshwater or saltwater and pressures up to 800 psi (5500 kPa, 560 meters depth). Connect two LI-192SA sensors to the 2009S Lowering Frame for downwelling or upwelling radiation studies. Limnologists, oceanographers and biologists conducting aquatic productivity studies and vertical profiling have used these sensors extensively.
