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If you do not receive it within 24 hours or if you have any questions, please cont'ac't LI-COR at 1-402-467-3576.

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-600 Porometer/Fluorometer

Enter to Win an LI-600!

Fast Track Your Greenhouse Research with the LI-600 Porometer/Fluorometer

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LI-250Q PAR Package

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 spot measurements of PAR intensity and quantity with unrivaled accuracy.

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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

Automatic Capture and Calculation of Daily Light Integral

Expand your light measurement capabilities with data logging, long-term measurements, continuous PAR measurement, and automated calculation of daily light integral with the LI-1500 DLI Package.

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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.

LI-180 Spectrometer

A Complete Spectral Profile of Supplemental Lighting

Precise, handheld spectral measurements with a polished and powerful interface ideal for the greenhouse grower on the move. Instant, one-click data capture provides actionable results 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 light bands can influence desired plant characteristics, including growth rate, chemical composition, taste, nutrition, and more.

The LI-180 spectrometer allows you to record 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 Yield Quality

diseased leaf

Enhance Disease Resistance

data screens

Instant Insights

Measure real-time changes from spectral manipulation, height adjustment, and plant positioning. In one click, the LI-180 records dozens of variables including PAR (as color-specific photosynthetic photon flux density (PPFD)), photon flux density (PFD), irradiance (W/m2), and more. Select a measurement to see details, such as ratios of red to blue or red to far-red intensity.

Actionable Results

Compare the spectra of your lighting to one of multiple reference spectra. Reference spectra are based on pigments important for photosynthesis and morphology, such as chlorophyll a or beta carotene. Then adjust your lighting strategy to better match the pigment peaks for species-specific responses throughout your greenhouse. View a variety of tabular and graphical outputs immediately after capture and create custom views and ratios to see your variables of interest.

man taking measurements with the LI-180
cell phone with LI-180 data

Flexible Software

In addition to the lightweight, portable design, the LI-180 mobile application provides excellent flexibility. Connect any Wi-Fi enabled device to quickly transfer data or customize your display by choosing variables of interest to you. Desktop software enables in-depth analysis, continuous or timed capture configuration, and file management capabilities.

Greenhouse Publications
and Webinars

Importance Of Light Measurement In The Cultivation Of Cannabis
Light is the most important parameter to understand and measure for effectively and efficiently growing high-quality Cannabis.

See the Poster

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

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.

LI-3100C Area Meter

LI-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