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ePAR and ePFD Sensors

Apogee Instrument's ePAR and ePRD sensors/meters provide a research grade measurement of photon flux density (PFD) beyond the standard range of 400-700 nm (PAR).
Apogee's new 380-760 nm Extended Photosynthetically Active Radiation (ePAR) and 340-1040 nm Extended Photon Flux Density (ePFD) sensors are designed for making total photon flux intensity measurements of wider ranges than traditional PAR sensors that measure 400-700 nm.
The new Apogee ePAR sensor was created in 2021 to measure the newly defined 380-760 nm ePAR radiation range that emerging research is showing to be photosynthetically active beyond the traditional 400-700 nm range. Many next generation LED fixtures, the sun, and other light sources emit these extended photosynthetic wavelengths, but they have not been measurable by traditional PAR meters until now. Much of the transformative work to define the ePAR range was conducted by Dr. Shuyang Zhen and Dr. Bruce Bugbee at Utah State University's Crop Physiology Laboratory. A few of the many articles discussing Dr. Zhen and Dr. Bugbee's research into ePAR can be found here, here, here, and here.
The ePFD sensor was created in 2020 to measure the total intensity of photons in the 340-1040 nm range. This wide measurement range is useful for applications like studying the photomorphogenic effect of UV, far-red, and even infrared security lights, which can affect certain plants during their dark periods. Because of the extra-wide measurement cutoffs of this sensor, it is not recommended for PAR measurements under any light source except LEDs where all wavelengths are known to be within the traditional 400-700 nm PAR or 380-760 nm ePAR range.

ePAR and ePFD Explained with Dr. Bruce Bugbee

Spectral Response
The ePAR sensor has a spectral range of 380 to 760 nm ± 5 nm. The ePFD sensor has a spectral range of 340 to 1040 nm ± 5 nm. The spectral responses can be seen in the graph below.
Graph showing the spectral response of an ePAR and Extended Range PFD sensor
Accurate, Stable Measurements
Sensors are cosine-corrected to maintain their accuracy when radiation comes from low zenith angles. The sensors measure PFD with a cosine response accurate within ± 5 % at 75° zenith angle. Long-term non-stability determined from multiple replicate quantum sensors in accelerated aging test and field conditions is less than 2 % per year.
Typical Applications
Total ePAR and ePFD intensity measurements over plant canopies in all growing environments, monitor and adjust grow lights, research plant morphogenic activity, and photobiology studies.
Apogee ePAR and ePFD sensors also available as handheld meter.
An Apogee ePAR and ePFD with microcache micrologger.
An Apogee Extended Range PFD sensor head.
Rugged, Self-cleaning Housing
Patented domed shaped sensor head (diffuser and body) facilitate runoff of dew and rain to keep the sensor clean and minimize errors caused by dust blocking the radiation path. Sensors are housed in a rugged anodized aluminum body and electronics are fully potted.
Calibration
To ensure accuracy each sensor is carefully calibrated in controlled conditions and traceable to NIST reference standards. The extended sensors are pre-calibrated for all light sources, though it is recommended SQ-620 series sensors are only used under LEDs.
Mounting
The AL-120 Solar Mounting Bracket with Leveling Plate facilitates mounting the sensor to a mast or pipe. The AL-100 Solar Sensor Leveling Plate is designed to level the sensor while sitting on a flat surface or mounting to a surface.
Output Options
Available in multiple analog output options including 0 to 40 mV, 0 to 2.5 V, 0 to 5 V, and 4 to 20 mA ranges. Digital output options include a digital “smart” sensor that uses USB communication and custom software to interface directly to a computer, SDI-12, and Modbus protocols. Sensors are also available attached to a hand-held meter with digital readout. The analog versions of these sensors (SQ-610, SQ-620) work with our µCache Bluetooth Micro Logger.
High Quality Cable
Pigtail-lead sensors feature an IP68, marine-grade stainless-steel cable connector to simplify sensor removal for maintenance and recalibration. Cable is shielded-twisted pair wire with a TPR jacket for high water resistance, UV stability, and flexibility in cold conditions.
Warranty and Support
All Apogee products are backed by an industry-leading four year warranty and outstanding customer support.

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PQ-610 Package: microCache and ePAR sensor with 30 cm cable
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PQ-610 Package: microCache and ePAR sensor with 30 cm cable

$619.00
PQ-612 Package: microCache and ePAR Sensor with 2 meter cable
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PQ-612 Package: microCache and ePAR Sensor with 2 meter cable

$639.00
PQ-620 Package: microCache and ePFD sensor with 30 cm cable
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PQ-620 Package: microCache and ePFD sensor with 30 cm cable

$619.00
PQ-622 Package: microCache and ePFD Sensor with 2 meter cable
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PQ-622 Package: microCache and ePFD Sensor with 2 meter cable

$639.00
MQ-610: 380-760 nm ePAR Meter
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MQ-610: 380-760 nm ePAR Meter

$568.00
MQ-620: 340-1040 nm ePFD Meter
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MQ-620: 340-1040 nm ePFD Meter

$568.00
SQ-610-SS 380-760 nm ePAR Sensor
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SQ-610-SS 380-760 nm ePAR Sensor

$415.00
SQ-612-SS 380-760 nm 0-2.5 V output ePAR Sensor
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SQ-612-SS 380-760 nm 0-2.5 V output ePAR Sensor

$460.00
SQ-614-SS 380-760 nm 4-20 mA output ePAR Sensor
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SQ-614-SS 380-760 nm 4-20 mA output ePAR Sensor

$515.00
SQ-615-SS 380-760 nm 0-5 V output ePAR Sensor
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SQ-615-SS 380-760 nm 0-5 V output ePAR Sensor

$460.00
SQ-616: 380-760 nm USB output ePAR Sensor
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SQ-616: 380-760 nm USB output ePAR Sensor

$465.00
SQ-617-SS 380-760 nm SDI-12 ePAR Sensor
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SQ-617-SS 380-760 nm SDI-12 ePAR Sensor

$515.00
SQ-618-SS Modbus Digital Output 380-760 nm ePAR Sensor
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SQ-618-SS Modbus Digital Output 380-760 nm ePAR Sensor

$515.00
SQ-620-SS 340-1040 nm ePFD Sensor
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SQ-620-SS 340-1040 nm ePFD Sensor

$415.00
SQ-622-SS 340-1040 nm 0-2.5 V output ePFD Sensor
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SQ-622-SS 340-1040 nm 0-2.5 V output ePFD Sensor

$460.00
SQ-624-SS 340-1040 nm 4-20 mA output ePFD Sensor
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SQ-624-SS 340-1040 nm 4-20 mA output ePFD Sensor

$515.00
SQ-625-SS 340-1040 nm 0-5 V output ePFD Sensor
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SQ-625-SS 340-1040 nm 0-5 V output ePFD Sensor

$460.00
SQ-626: 340-1040 nm USB output ePFD Sensor
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SQ-626: 340-1040 nm USB output ePFD Sensor

$465.00
SQ-627-SS 340-1040 nm SDI-12 ePFD Sensor
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SQ-627-SS 340-1040 nm SDI-12 ePFD Sensor

$515.00
AT-100 microCache Bluetooth Micro Logger
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AT-100 microCache Bluetooth Micro Logger

$319.00
AA-100: Protective Carrying Case
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AA-100: Protective Carrying Case

$24.00
AL-100: Solar Sensor Leveling Plate
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AL-100: Solar Sensor Leveling Plate

$44.00
AL-120 Solar Mounting Bracket with Leveling Plate
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AL-120 Solar Mounting Bracket with Leveling Plate

$64.00
AM-310: Sensor Wand
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AM-310: Sensor Wand

$62.00

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About Apogee Instruments, Inc.

Address:
721 West 1800 North
Logan, UT 84321
United States of America

Hours: Monday-Friday 8 AM- 5 PM MST

Main Line / Order Status: (435) 792-4700
or sales@apogeeinstruments.com

Technical Sales and Support: (435) 245-8012
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  • products
    • Pyranometers
    • Quantum (PAR, ePAR, ePFD) Sensors / Meters
    • Daily Light Integral Measurement
    • Infrared Radiometers
    • Aspirated Radiation Shield
    • Spectroradiometers
    • Net Radiometer
    • Pyrgeometers
    • Humidity Probes
    • Temperature Sensors
    • Leaf and Bud Temperature Sensor
    • Oxygen Sensors
    • UV Sensors
    • Chlorophyll Concentration
    • Barometric Pressure
    • PAR Meters for Aquariums
    • microCache Bluetooth Micro Logger
    • Red - Far-red and PAR-FAR Sensors
    • Photometric Sensor
    • PRI Sensors
    • Solar Energy PV Monitoring
    • Accessories
    • Calibration Services
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    • Contact Us
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