Par Meter - handheld tester for Photosynthetic Absorbtion Radiation spectrum
PAR is the range of colours used by plants
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This Handheld PAR meter is used to work out what the quality and quantity of light is getting to your plants. A Lux meter only tests brightness in terms of our eyes, and mainly for photography. It does not take into account what colours are being produced and if the plant can use those colours effectively.
For instance - a bright green light might register on a lux meter; but the lack of a total PAR spectrum means we will have a low PAR reading and the plants will do very badly
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