Trade in your LI-6400/XT for a new LI-6800
Request a Quote
Future-Proof Your Lab's Legacy
The LI-6400/XT Portable Photosynthesis System has been the backbone of countless discoveries in your lab, delivering results you can trust. And as research evolves, the tools you rely on must evolve, too. Upgrading to the LI-6800 equips your team with a tool that's not only as reliable (and durable) as the LI-6400/XT but more powerful, versatile, and easier for the next generation of researchers to use.
Don't let yesterday's technology hold back tomorrow's breakthroughs. Ensure your work continues to drive innovation by trading in your LI-6400/XT for the LI-6800 today.
What Your Colleagues Are Saying
Don't just take our word for it—see why other researchers have upgraded to the LI-6800 and how it continues to transform their work.
Switching from the LI-6400XT to the LI-6800 sig-nificantly upgraded our user experience—[the] new software functions and rapid A/Ci curves, USB data transfer, touchscreen, and intuitive interface have made it easier and more intuitive to collect measurements.
Dr. Katie M. Murphy
Director of Phenotyping and Principal Investigator,
Donald Danforth Plant Science Center
The Dynamic Assimilation Technique [only available on the LI-6800] is really helpful and will truly be a potential that hasn't been tapped into yet by the field.
Dr. Berkley Walker
Associate Professor,
Michigan State University
Plant Research Laboratory/Plant Biology
Why It's Better
Easier to Use
Quickly navigate the LI-6800 with a large color display, touchscreen, and one-button start—the ideal design for new and seasoned researchers alike.
Learn More
More Chamber Options
Go beyond terrestrial plant physiology with the Aquatic Chamber or dive deeper with additional chambers and accessories for needles, soil, and custom applications.
Learn More
Faster Results
Get full response curves in a fraction of the time using the Dynamic Assimilation Technique (DAT), available only on the LI-6800 with the 6800-01A Fluorometer.
Learn More
Same Trusted Quality
Continue relying on the global standard of plant research technology and the trusted support you expect from LI-COR photosynthesis systems.
Learn MoreA Side-by-Side Comparison
Interested in the details? See how the specifications of both instruments stack up. Use the show/hide sections below to see how the LI-6800 offers real-world advantages for your lab.
| LI-6400/XT | LI-6800 | THE LI-6800 ADVANTAGE | |
|---|---|---|---|
| Precision | |||
| CO2 Analyzer Precision | Within 0.2 μmol mol-1 RMS with 4-second averaging at 400 μmol mol-1 | Within 0.1 μmol mol-1 RMS with 4-second averaging at 400 μmol mol-1 | Contributes to better, faster, and more repeatable CO2 flux at higher flow rates |
| H2O Analyzer Precision | Within 0.017 mmol mol-1 RMS with 4-second averaging at 10 mmol mol-1 | Within 0.010 mmol mol-1 RMS with 4-second averaging at 10 mmol mol-1 | More accurate and repeatable data collection |
| H2O Control | |||
| Software Automated H2O Control | No Requires manual intervention (knob) and is dependent on flow rate | Yes Fully automated under software control | Faster, more accurate, and more precise control at the desired setpoint More repeatable H2O flux, conductance, and Ci data |
| H2O Control Independent of Flow Control | No | Yes | New chemical column design makes it easier to service the chemicals |
| CO2 Control | |||
| CO2 Cartridges | 12g | 8g | Readily available worldwide and less likely to be contaminated by oil. No filtering required |
| Lowest CO2 Control Point (other than zero) without system modification | About 50 ppm | About 1 ppm Lowest CO2 control point dependent upon no buffering of CO2 in humidification or desiccant source. | More precision and broader range of operation results in more accurate determination of CO2 compensation point |
| Flow, Leaks, and Matching | |||
| Flow | Split in console | Split in sensor head | Reduces potential for differential diffusion and sorption rates that can result in systematic biases |
| Maximum Flow | 750 µmol s-1 | 1400 µmol s-1 | Faster measurements and more latitude in larger chamber designs |
| Chamber Overpressure | Manual | Automatic/measured/ user controlled | Creates small outward flow from chamber to counteract inward diffusion leaks |
| Range Matching | No Air goes from leaf chamber to reference analyzer | Yes Reference air goes directly to both analyzers | Faster and more accurate range matching |
| Temperatures | |||
| Operating Temperature Range | 0 -50 °C | 0-50 °C | Wide operating range for both instruments |
| Leaf Temperature Control Range | ± 6 °C from ambient | ± 10 °C from ambient | Expanded range of temperature control adds experimental flexibility to the instrument |
| Leaf Temperature Sensor | Type E fine wire thermocouple | Type E fine wire thermocouple (more robust design with capability to do 2X measurements) | Maintains low thermal mass of fine wire while improving reliability of sensor |
| Tleaf Derived from Energy Budget | Available | Available | Non-contact determination of Tleaf from energy budget calculation due to accurate, more uniform characterization of light on leaf, and more precision on H2O measurement |
| Software | |||
| Dynamic Assimilation Technique | No | Yes | Saves time, improves measurement quality, and allows for measurements under dynamic environmental conditions |
| Console Display | Backlit 8x40 character LCD with character key control | Large color touch screen | Interactive and easy to view |
| Sensor Head Display | None | Three lines of variables | Ability to view data when console display is not in view |
| Illustrated Workflow of Environmental Controls | No | Yes | Intuitive and easy to learn for users of all experience levels |
| Customizable Background Programs | No | Yes | Customize CO2 and light response curves or create a unique sampling protocol to standardize experiments and data collection |
| System Alerts | A few | Many | More warnings and alerts help guide users to optimal performance and data collection |
| System Tests | Limited | Automated | Easy to check instrument functionality |
| Power | |||
| Ah Per Battery (When New) | 3.4 (3.4 X 2 = 6.8 Ah per charge) | 6.8 (6.8 X 2 = 13.6 Ah per charge) | |
| Battery Power Density | 2.1 Ah/kg | 15.1 Ah/kg | Provides more power in a smaller battery |
| Weight/Ergonomics | |||
| Total System Weight, Fully Configured | 12.69 kg | 9.98 kg | Easier to carry |
| Wheeled Carrying Case | No | Yes | Roll, rather than carry, instrument case |
| Dedicated Accessories Case | No | Yes | Ergonomic foam inserts for organization of accessories |
| Tripod for Console | No Sensor head mount only | Yes | Can be used to support either the sensor head or console |
| Carrying Harness | No | Yes | Can be used to support either the sensor head or console |
| Fluorometer | |||
| Leaf Aperture | 2 cm2 | 2 cm2 or 6 cm2 | A larger chamber aperture allows for more uniform light distribution, which improves fluorescence and gas exchange measurement accuracy |
| Fluorometer Saturating Flash | 7,000 µmol m-2s-1 | 16,000 µmol m-2s-1 | Capable of significantly higher flash intensities, which allows for more accurate estimation of maximum fluorescence and derived parameters |
| Multiphase™ Flash Fluorescence Capable | Yes | Yes | Multiphase Flash fluorescence protocol estimates maximum light-adapted chlorophyll fluorescence (Fm') at lower flash intensities, reducing potentially negative flash-induced effects |
| Induction Kinetics | No | Yes | High-frequency modulation provides high-resolution transient measurements for induction kinetics |
| Modulation Frequency | Four Presets 0.25, 1, 10, and 20 kHz | Fully customizable dark and light modulation frequencies 10 Hz to 50 kHz | Greater flexibility to suit a variety of research applications and sample materials |
| DC PSII Fluorescence | No | Yes | Takes continuous measurements of chlorophyll fluorescence |
| Data and Communications | |||
| Console Memory | 128 mb operation and 64 mb data storage | 2 GB operation and 8 GB flash data storage | Significantly more memory for faster operation and storage of data |
| Ethernet | Yes | Yes | |
| Miscellaneous | |||
| Chamber Latching Mechanism | Manually adjusted pressure | Constant pressure | More uniform, consistent pressure on leaf |
| Improved Chemical Columns | No | Yes | Easier to fill, seal, and attach to the console, requiring minimal maintenance. |
| Console Maintenance | Many internal replaceable fuses and a filter | Internal resettable fuses and one console filter | Reduced maintenance requirements |
Leaf Chamber(s)
LI-6800 chambers and light sources accommodate leaves of nearly any shape and size, algae, and other aquatic organisms. See which ones are ideal for your environmental work.
Explore