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A pyranometer is a radiometric instrument designed to measure global horizontal irradiance (GHI), the total solar energy arriving on a horizontal surface from the entire sky dome. Widely used for photovoltaic performance monitoring, meteorological stations, solar resource assessment and climate research, pyranometers are commonly grouped by sensing principle and by the official ISO 9060 classification

What Exactly Is PAR (Photosynthetically Active Radiation)?Photosynthetically Active Radiation (PAR) defines the range of light photons that plants can utilise to drive photosynthesis, converting carbon dioxide and water into biomass, sugars and crop yields. Unlike human‑oriented lux meters which measure perceived brightness, quantum PAR sensors count photons, reporting PPFD (Photosynthetic Photon Flux Density) in μmol/m²·s