The standard for light measurements

Redesigned light sensors optimized for ecological, meteorological, solar energy, plant research, and underwater measurements.

A new design that builds on our 40+ years of experience producing light sensors.

Learn more about the science and engineering behind the new sensors.

Water shedding design Interchangeable heads Detachable base Multiple output signals

Featured Application: Light Measurement in Greenhouses and Growth Chambers

Capture and log light intensity and spectral composition measurements for maximizing production and energy efficiency in your greenhouse with the LI-250Q PAR Package, LI-1500 DLI Package, and LI-180 Spectrometer.

LI-180 Spectrometer

Record the spectral output of your light sources at the single nanometer level with dozens of variables.

LI-190R Quantum Sensor

Industry-leading photosynthetically active radiation measurement precision—no matter the source.

LI-191R Line Quantum Sensor

Integrates below-canopy photosynthetically active radiation measurements over a 1-meter length in µmol s^-1 m^-2.

LI-192 Underwater Quantum Sensor

Underwater photosynthetically active radiation measurements from all angles in one hemisphere in µmol s^-1 m^-2.

LI-193 Spherical Underwater Quantum Sensor

Underwater photosynthetically active radiation measurements from all directions in µmol s^-1 m^-2.

LI-200R Pyranometer

Measures global solar radiation in watts per square meter (W m^-2) for various research applications.

LI-210R Photometric Sensor

Measures visible light with the same sensitivity as typical the human eye in lux or lumens.

LI-250A Light Meter

A portable read-out-device that provides instant readings from any light sensor you connect.

LI-1500 Light Sensor Logger

Adds data logging, long-term measurements, and automated calculation of daily light integral to your light management.

Greenhouses and Growth Chambers

Track variables critical to light management, such as photosynthetically active radiation, daily light integral, and spectral composition.

Solar Power Optimization

Accurately assess resources to support site planning and optimization to maximize solar energy yield.

Accessories

A variety of light measurement accessories for the light sensor and logging devices.