Apogee Instruments - SQ-640-SS: Quantum Light-Pollution Sensor

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The Apogee SQ-640-SS is a highly sensitive quantum light-pollution sensor (340 to 1040 nm) designed to detect the small light leaks during dark periods that can disrupt photoperiod -sensitive crops.Stray photons during the dark period can trigger problems such as unwanted flowering response, hermaphroditism, and stunted growth. The SQ-640 is sensitive enough to find leaks the eye and standard PAR sensors miss. It is a specialty sensor that over-ranges under normal grow-light levels.Key Features Extended range 340 to 1040 nm, optimized for low light Detects light leaks that disrupt plant dark periods Helps prevent hermaphroditism and photoperiod stress Analog, SDI-12, or microCache options Built and calibrated in Logan, Utah; NIST-traceable, made in the USA, and backed by an industry-leading 4-year warranty. Why Choose This ModelThe SQ-640 protects photoperiod integrity by finding the light leaks that cause costly crop problems.Ideal Applications Dark-period light-leak audits Photoperiod-room commissioning Blackout and light-deprivation verification Show more