Students now can perform various activities measuring light both terrestrial and underwater.
The LEEF Light Package
The LEEF Light Package is designed for students to perform various activities measuring light both terrestrial and underwater. When sensors are connected to the LI-1400 Datalogger, data can be logged at pre-determined time intervals. Instantaneous readings can be made by connecting s 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 (umol 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.
The LEEF Light Package Includes:
- LI-1400 Datalogger: Designed for easy programming and connection of all LI-COR light sensors. Includes three BNC connectors for use with “SA” version light sensors. Includes 4 AA batteries, RS-232 Serial Cable, RS-232 to USB Adapter, Windows Communication Software and Instruction Manual.
- 1400-320 Storage Case: Used for the LI-1400 Datalogger, can also store light sensors.
- LI-250A Light Meter: Includes one BNC connector for direct connection of “SA” version light sensor. Displays data on easy-to-read screen. Press HOLD to pause the readings, or AVERAGE for a 10-second average. Does not store data. Includes battery and instruction manual.
- 250-01 Carrying Case: Used for the LI-250A Light Meter, can also store a single light sensor.
- LI-190SA Quantum (PAR) Sensor: Measures the 400-700 nm part of the spectrum in umol/s/m2. Includes a standard 10 feet (approximately 3 m) of cable.
- LI-200SA Pyranometer: Measures global solar radiation in watts/m2. Includes a standard 10 feet (approximately 3 m) of cable.
- Two 2003S Mounting and Leveling Fixtures: Used for easy mounting of the LI-190SA or LI-200SA sensors. Includes a bubble for accurate leveling.
- Two LI-192SA Underwater Quantum (PAR) Sensors: Measures the 400-700 nm part of the spectrum in umol/s/m2. Used both for underwater and terrestrial measurements.
- Two 2222UWB-3 Underwater Cables: Required to connect the LI-192SA Underwater Quantum (PAR) Sensor to either the LI-1400 Datalogger or LI-250A Light Meter. Three meters in length. It uses a waterproof connector on the sensor end and a BNC connector on the other end. One cable per sensor is required.
- 2009S Lowering Frame: Provides stability and orientation for underwater sensors. Can connect 1 or 2 sensors.
- 100L Lubricant: Lubricates and displaces water in underwater connectors.
The LEEF Light Package is designed to support inquiry-based education in primarily undergraduate institutions. If you are not certain you qualify for this Program, please contact Chris Mantzios or Kristin Feese at 800-447-3576 or email at leef@licor.com. Unlike the LEEF Ecophysiology Package, no application is needed to qualify.
