Measure the light that matters, no matter the source

Plant growth is driven by PAR, which occurs at wavelengths between 400 and 700 nm. Not all light contains PAR, and PAR requirements vary between types and growth stages of plants.

The LI-190R Quantum Sensor, included in the LI-250Q package, provides uniform sensitivity across the entire PAR waveband, delivering the most accurate PAR measurements of any sensor on the market.

The LI-190R Quantum Sensor measures PAR inside greenhouses and growth chambers with the same precision from the sun, artificial lighting, or both without the need for calibration or correction factors. Compatible artificial sources include incandescent and high-pressure sodium lamps, high-intensity fluorescent lights, and the rapidly emerging range of LED light systems.

Why take instantaneous PAR measurements?

The LI-250Q package allows you to capture the instantaneous flux of photons (µmol m^-2 s^-1) with wavelengths in the PAR range to assess whether your plants are getting enough light at any one point in time. This assessment depends on your unique lighting requirements and can be used to make informed light management decisions, including:

• Plant placement and spacing
• Types of supplemental lighting
• Distance of supplemental lighting from plants