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When choosing an LED grow light, one of the most important factors to understand is PAR (Photosynthetically Active Radiation). Unlike wattage alone, PAR measures the light wavelengths that plants can use for photosynthesis, making it a better indicator of grow light performance. This guide explains what PAR is, why it matters, how it differs from other lighting measurements, and what to consider when selecting an LED grow light for indoor gardening, horticulture, or commercia