Link4 1800 Cloud

Quantum (PAR) Light Sensor

Measure Exactly What Your Plants Receive

NOTE: THIS IS NOT FOR NEW PROJECTS. CHECK OUT THE NEW LINK4 QUANTUM PAR LIGHT SENSOR HERE.

Take the guesswork out of lighting with Link4’s PAR Light Sensor. Designed to precisely measure PPFD (Photosynthetic Photon Flux Density), this rugged, self-powered sensor gives growers accurate data on how much light plants are actually absorbing—day or night, rain or shine.

Key Benefits:

  • Accurately measures PPFD for optimized plant growth
  • Calibrated for natural sunlight and greenhouse conditions
  • Ideal for aquaponics, hydroponics, and greenhouse environments
  • Rugged, self-cleaning design ensures longevity
  • Self-powered and maintenance-free

$989.00

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Grow smarter with the precision of the PAR Light Sensor.

  • Sensor Range: Visible light spectrum
  • Compatibility: Designed for use with Link4 iGrow systems, not for newer projects
  • Function: Controls curtains, lights, CO₂, and irrigation
Power SupplySelf-powered
Output (sensitivity)0.1 mV per μmol m⁻² s⁻¹
Calibration Factor10 μmol m⁻² s⁻¹ per mV
Measurement RepeatabilityLess than 0.5%
Measurement Range0 to 2,500 μmol m⁻² s⁻¹
Non-linearityLess than 1%
Response TimeLess than 1 ms
Operating Environment-10 to 60C; 0 to 100% relative humidity; can be submerged in water
Field of View180°
Dimensions30.5 mm diameter, 36.6 mm height
CableShielded pigtail cable with marine-grade IP68 M8 connector
1. What does this sensor measure?
It measures PPFD—how much usable light plants receive for photosynthesis.
2. Can I use this outdoors or in aquaponics?
use and ideal for aquaponics setups.
3. How often do I need to clean or maintain it?
Its self-cleaning design minimizes maintenance over time.

Link4 Cloud for Web, Android, and iOS

The Link4 Cloud is the latest innovation to Link4’s Cloud technology, supporting the new Pearl controller.

Monitor and set your controllers from anywhere. Create reports, view graphs, and collect data. Log notes using the Grow Journal. Do all of this and more using the intuitive user interface.

Download on the App StoreGet it on Google Play
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