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PAR meter

With the PAR meter you can check the amount of light used by plants for growth and the photosynthetically active radiation.


With the PAR meter you can check the amount of light your plants use for growth.

The light that drives the photosynthesis in plants is photosynthetically active radiation or PAR light. This is also known as quantum light, because it is measured in units of moles impacting an area over time. Measuring quantum light can tell you whether your plants are getting a sufficient amount of light.

"Measuring DLI inside a greenhouse can be very revealing as growers often rely on their eyes to determine light levels and the human eye is a terrible light sensor because it is not as effective at adjusting to different shades of light." James E. Faust (Associate Professor of Horticulture, Clemson University).

You may also be interested in the light meter DLI 100. The system calculates the daily light intensity (DLI) for 24 hours a day.

Product reference for orders: PT-114

Additional information

Light range

400 to 700 nm (PAR)




0 to 1.999 µmol-m-2-s-1



Accurate cosine correction

+3% at 45º and +-7/ at 80º.


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