Apogee Quantum Light Pollution Sensors (Sq-640)

Many plants are affected by interruptions in dark periods even by extremely dim light. Apogee’s new Quantum Light Pollution Sensor is designed to detect photons from 340-1040 nm that are below the sensitivity level of a typical quantum sensor. Detecting stray photons that disrupt the night is critical in preventing negative effects in plants such as plant hermaphrodism and stunted growth. The patented, dome-shaped aluminum head is cosine-corrected, self-cleaning, and fully-potted for a waterproof design

Features: TYPICAL APPLICATIONS

•Incoming PFD measurements over plant canopies

in indoor greenhouses or in growth chambers,

and reflected or under-canopy (transmitted) PFD

measurements in the same environments

•Measuring extremely dim light that may cause

interruptions in plant dark periods

MULTIPLE OUTPUT OPTIONS

•Analog

•4 to 20 mA

•SDI-12 output

ACCURATE, STABLE MEASUREMENTS

Cosine-corrected with directional errors less than ± 5 % at a solar zenith angle of 75°. Long-term non-stability less than 2 % per year.

HIGH QUALITY CABLE

Pigtail-lead sensors feature on IP68, marine-grade stainless-steel cable connectors attached directly to the sensor head to simplify sensor removal for maintenance and recalibration

CALIBRATION TRACEABILITY

Apogee Instruments SQ-600 series quantum sensors are calibrated through side-by-side comparison to the mean of four transfer standard quantum sensors under a reference lamp. The transfer standard quantum sensors are recalibrated with a quartz halogen lamp traceable to the National Institute of Standards and Technology (NIST).