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Par meters vs LUX meters. We discuss the differences and why they cannot be directly compared.

How they work.

Why you need a good quality Quantum PAR meter like the SpotOn by Innoquest.

LUX meters do not measure photosythetic light. They only measure the relative brightness of a lightsource. PAR meters measure the quanitity of photosythetic light landing on the sensor at any given moment.

PAR meters measure photosythetic light between 400-700nm wavelengths which is the ideal range for plant growth. LUX meters do not read spectral wavelengths.

Quality PAR meters like the SpotOn Quantum PAR meter also correct for "azimuth" which is light that is transmitted from the side and not just directly into the sensor. LUX meters do not measure Azimuth light levels.

The SpotOn PAR Meter also measures DLI or daily light integral which is the total amount of photosythetic light over a 24 hour period. This is an important measurement for greenhouse lighting levels as the sun passes over each day, providing different light levels as it does. And for indoor growing where lights are using advanced dimming setups to simulate clouds, sunrise and sunset to mimic nature.



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