Comparison Chart

Spectral Errors
Features
APOGEE QUANTUM SENSORS |
Original & Full-Spectrum Series
Apogee Instruments Quantum Sensors are the
tool of choice for researchers and agricultural
professionals measuring photosynthecally acve
radiaon (PAR) all over the world. Apogee oers
two types of quantum sensors: a Full-spectrum
Quantum (previously gold) and Original Quantum
Sensor. Consult our spectral response graph to
decide which model is right for your applicaon.
Accurate, Stable Measurements
Cost-eecve, original quantum sensors work
well for broadband radiaon sources (sun,
high-pressure sodium, metal halide, cool white
uorescent lamps), while full-spectrum sensors
are good for all light sources, including LEDs.
Oers a self-cleaning, cosine-corrected head that
is fully-poed for a waterproof design.
Typical PPFD Measurement
Applicaons
• Incoming and reected PPFD over and under
plant canopies in greenhouses, in elds, and in
growth chambers
• Aquac environments including salt water
aquariums and freshwater lakes and streams
Calibraon Traceability
Apogee SQ series quantum sensors are calibrated
through side-by-side comparison to
the mean of four transfer standard sensors under
a reference lamp. The reference sensors are
recalibrated with a quartz halogen lamp traceable
to the Naonal Instute of Standards and
Technology (NIST).
The photosynthecally acve
radiaon measurement tool of
choice for lighng researchers
Sun (Clear Sky) -2.2 0.0 -0.4 -1.0
Sun (Cloudy Sky) -1.7 1.4 -0.2 -1.3
Sun (Reected from Deciduous
Leaves)
-2.0 4.9 -0.8 1.1
Sun (Transmied below Wheat
Canopy)
-1.1 6.4 -0.1 -0.3
Cool White Fluorescent (T5) 0.0 0.0 0.0 0.0
Metal Halide 0.9 -3.7 0.2 -1.7
Ceramic Metal Halide -0.3 -6.0 0.4 -0.7
High Pressure Sodium 0.0 0.8 1.3 1.4
Red/Blue LED (16 % 444 nm, 84 %
667 nm peaks)
-3.4 -65.3 3.5 -1.8
Red/White LED (6.5 % 436 nm, 4.5
% 531 nm, 89 % 668 nm peaks)
-3.0 -60.3 2.6 -1.7
Apogee
SQ-500
Apogee
SQ-110
SQ-120
LI-COR
LI-190
Kipp &
Zonen
PQS 1
Above: Spectral response of original quantum sensor (black) and full-
spectrum quantum sensor (blue) compared to dened response of plants
to radiaon (dashed).