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This technical article presents the theoretical fundamentals and metrological implementation of photosynthetically active radiation (PAR) measurements. It describes the basics of light measurement with respect to the absorption of light by plants and its effect on plant growth, etc. The spectral light meter products that are described in this paper have been developed by Gigahertz-Optik GmbH with functions specifically developed for this application. They offer particular advantages when assessing LED grow lights, for example, compared to traditional PAR sensors.
