PLANT
PHYSIOLOGY

The Global Leader in Plant Physiology Research Instruments

From handheld light meters to portable photosynthesis systems that support customizable gas exchange and chlorophyll a fluorescence analyses, our instruments deliver best-in-class photosynthesis and plant physiology research technology built upon 40+ years of experience.

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LI-6878 in a field

LI-6878 Leaf Trace Gas Integration System

Seemless integration for real-time CO₂ isotope, CH₄, or N₂O measurements at the leaf level.

LI-6800 in a rice field

LI-6800 Portable Photosynthesis System

Robust research tool with customizable chambers that measures photosynthetic gas exchange, chlorophyll a fluorescence, and more.

LI-600N measuring a needle

LI-600 & LI-600N Porometer/ Fluorometers

Rapidly measures stomatal conductance and chlorophyll a fluorescence over the same leaf/needle, simultaneously.

LAI-2200

LAI-2200 Plant Canopy Analyzer

World standard for indirect leaf area index measurements outperforms methods such as Ceptometry and Hemispherical Photography in terms of flexibility, advanced features, accuracy, and ease of use.

LI-180

LI-180
Spectrometer

Records the spectral composition of light sources at the single nanometer level, including photosynthetically active radiation (PAR) and other wavelengths

LI-190R

LI-190R Quantum
PAR Sensor

Provides accurate measurements for most broad-spectrum light sources, including natural sunlight, artificial, or mixed sources, to evaluate plants' light use.

MX2308 in a greenhouse

MX2308 Temp/ RH/ PAR Data Logger

Bluetooth-enabled HOBO data logger with LI-190R sensor provides research-grade PAR/Temp/RH measurements and automates DLI/VPD calculations

MX2309 on a solar panel

MX2309 Temp/ RH/ Solar Data Logger

Bluetooth-enabled HOBO data logger with LI-200R sensor provides research-grade Temp, RH and solar radiation measurements

LI-191R

LI-191R Line Quantum PAR Sensor

Ideal for plant canopies where light field is non-uniform, measures PAR over a 1-meter length in Photosynthetic Photon Flux Density (PPFD) units

LI-250A

LI-250A
Light Meter

Portable device that provides readings from any light sensor you connect

LI-1500

LI-1500 Light Sensor Logger

Provides long-term measurements and automated calculation of daily light integral (DLI)

Featured Publications

See how researchers like you use our plant physiology solutions to answer real-world questions.

Embracing native diversity to enhance the maximum quantum efficiency of photosystem II in maize

Learn how researchers used the LI-600F and LI-6800F to measure maize photosynthetic performance, chlorophyll fluorescence, and CO₂ response traits tied to PSII efficiency and low-temperature stress.

LI-600FLI-6800F

The Dynamic Assimilation Technique measures photosynthetic CO₂ response curves with similar fidelity to steady-state approaches in half the time

Explore how the LI-6800 supported Dynamic Assimilation Technique A/Ci measurements that produced CO₂ response curves comparable to steady-state approaches in about half the time.

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Looking for manuals, software, or help with the photosynthesis measurements?

Visit the technical support center for software, operating instructions, videos, and tips.

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