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Thank you for your interest in the LI-180 Spectrometer.

Unfortunately, the LI-180 is only currently available in select countries. We will notify you when the LI-180 is available for purchase in your country.

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Request a Quote for the LI-180 Spectrometer

LI-COR Greenhouse Light Measurement

LI-250Q Portable Greenhouse and Growth Chamber Light Measurement System

Light management is a critical factor in commercial greenhouse and growth chamber efficiency. Choose the LI-250Q package for unrivaled accuracy in a simple, versatile light monitoring package. Includes the LI-190R Quantum Sensor, LI-250A Light Meter, and 2003S Mounting and Leveling Fixture.

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LI-190R Quantum Sensor
figure showing LI-190R response and ideal quantum response
figure showing LI-190R response and ideal quantum response
LI-190R response vs. ideal quantum response in energy units (top) and photon units (bottom).

Measure the Light That Matters, No Matter the Source

Plant growth and reproduction is driven by photosynthetically-active radiation (PAR), which occurs at wavelengths between 400 and 700 nanometers. Not all light contains PAR, and PAR requirements vary between types and growth stages of plants.

The LI-190R Quantum Sensor, included in the LI-250Q package, provides uniform sensitivity across the entire PAR waveband, delivering the most accurate PAR measurements of any sensor on the market.

The LI-190R Quantum Sensor measures PAR inside greenhouses and growth chambers with the same precision in sun, artificial lighting, or both, without the need for calibration or correction factors. Compatible artificial sources include incandescent and high-pressure sodium lamps, high-intensity fluorescent lights, and the rapidly emerging range of LED light systems.

Why Take Instantaneous PAR Measurements?

The LI-250Q package allows you to capture the instantaneous flux of photons (µmol m-2 s-1) with wavelengths in the PAR range to assess whether your plants are getting enough light at any one point in time. This assessment depends on your unique lighting requirements and can be used to make informed light management decisions, including:

  • Plant placement and spacing
  • Types of supplemental lighting
  • Distance of supplemental lighting from plants

LI-1500 DLI Package

Expand your light measurement capabilities with data logging, long-term measurements, and automated calculation of daily light integral with the LI-1500 DLI Package. Package contents include the LI-190R Quantum Sensor, LI-1500 Light Sensor Data Logger, and 2003S Mounting and Leveling Fixture.

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figure showing LI-190R response and ideal quantum response
DLI is a measure of the total amount of light received in a single day in a particular area. DLI is calculated as the time integral of the series of instantaneous PPFD readings (Qi) taken at regular intervals (Δti).

Why Measure Daily Light Integral?

An important lighting consideration is the total amount of light your plants receive on a daily basis, which cannot be easily extrapolated from instantaneous measurements. One of the most common ways of calculating total daily light is Daily Light Integral, or DLI, which reports a total number of moles (not micromoles) of photons per day (instead of per second).

Maintaining a consistent DLI based on your plant type and growth stage is critical for achieving ideal growth and maximum yield. However, the amount of supplemental lighting required to maintain a consistent DLI can vary dramatically throughout the year. Providing too little light may negatively impact growth and production, while providing too much light may also negatively impact growth while wasting costly energy resources. With the LI-1500 DLI package, you can be confident you are providing the right amount of light to optimize production in your greenhouse while conserving resources and being mindful of your bottom line.

Simplify DLI Calculation with the LI-1500 DLI Package

Accurate DLI measurements require that measurements are taken at precise, regular intervals, and use complex calculus to find the integral of the intensity-time curve. The LI-1500 DLI package greatly simplifies this process, automatically capturing data at the correct intervals and doing the math for you.

After programming your LI-1500 based on your light sensor’s calibration information, calculating DLI takes 3 simple steps:

  1. Deploy in your greenhouse. The LI-1500 and LI-190R are rugged and well-suited for long-term deployment in hot and humid greenhouses.
  2. Let the LI-1500 log data over your measurement period. From a short 8-hour winter day to several days or weeks at a time.
  3. Download your data file. The LI-1500 automatically calculates DLI and reports it in a comprehensive format showing how DLI changes at each measurement.
Measuring Daily Light Integral with the LI-1500 Light Sensor Logger

A quick start guide is also included in the package, demonstrating the steps required to program your LI-1500 and LI-190R for DLI measurements.

Download the guide here.

New LI-180 Spectrometer

Precise, portable spectral measurement technology with flexible software options ideal for the greenhouse grower always on the move. One-click data capture and instantaneous feedback deliver actionable insights in seconds.

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Why Measure Spectra?

Not all light affects plant growth and reproduction the same way. Modifying the intensity of specific bands of light can provide enhanced control of desired plant characteristics including growth rate, chemical composition, taste and nutrition, and more.

The LI-180 spectrometer allows you to capture and optimize the spectral composition of your supplemental lighting which can add significant value to your greenhouse or growth chamber operation.


Shorten Production Time

growing plant

Improve the Quality of Your Yield

diseased leaf

Enhance Disease Resistance

One-Click Data Capture

Get actionable insights in seconds. Collect multiple captures to measure changes from spectral manipulation, height adjustments, and plant positioning changes in real-time. With a single click, the LI-180 captures dozens of parameters including color-specific photosynthetic photon flux density (PPFD), photon flux density (PFD) at 1-nm intervals between the entire 380 and 780 nm interval, irradiance (W/m2), and more.

data screens
cell phone with LI-180 data

Flexible Software Options

The LI-180 mobile application provides additional flexibility to the lightweight, portable instrument. Connect to your instrument via Wi-Fi from a computer, tablet, or mobile device, customize your display by choosing your parameters of interest to create personalized views, and quickly transfer data between devices. Desktop software is also available for in-depth analysis, continuous or timed capture configuration, and file management capabilities.

Greenhouse Publications
and Webinars

Growing Research, Responsibility, and Relationships at Michigan State
Dr. Roberto Lopez and his lab discuss making discoveries and using science to connect with others.

Read the Customer Story

Must-Have Meters
LI-COR greenhouse light measurement products were recently featured in a GrowerTalks cover story.

Read the Article at GrowerTalks

Measuring Light in a Greenhouse: Why, What, When, and How
Join LI-COR and industry experts as they discuss light measurement devices and the dos and don’ts of greenhouse light measurement.

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Grow Confidently with LI-COR, Today and Tomorrow

Built upon 45+ years of light measurement experience, other LI-COR instruments for Greenhouse and Growth Chamber research and commercial production include:

LI-830 and LI-850

LI-830 CO2 and LI-850 CO2/H2O Gas Analyzers

Precise, stable infrared gas analyzers ideal for greenhouse monitoring.


LI-6800 Portable
Photosynthesis System

Precision gas exchange and chlorophyll fluorescence measurements with the most advanced photosynthesis instrument available.


LI-3000C Portable Leaf Area Meter

Nondestructive measurement and logging device for leaf area.


LAI-3100C Area Meter

Efficient, high-throughput area measurements with user-selectable area resolution.

LI-190R in greenhouse LI-850 in greenhouse LI-3000C in greenhouse LI-6800 in greenhouse