PAR (Photosynthetically Active Radiation)

Photosynthetically Active Radiation (PAR) refers to the range of light wavelengths, roughly 400 to 700 nanometers, that plants use for photosynthesis. This specific light spectrum provides the energy that plants need to produce sugars and grow. PAR is a critical factor in agriculture, horticulture, and ecological studies, as it measures the amount of usable light available for plant processes. Unlike total sunlight, PAR focuses solely on the light wavelengths that directly influence plant health and productivity, making it a key measurement for understanding and optimizing plant growth environments.