Radiometry is a broad field encompassing all techniques for measuring electromagnetic radiation, including the measure of visible light
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Measurment of light, measurement with light
Gigahertz-Optik is a German company founded in 1986. Today they boast one of the most extensive ranges of spectral broadband lightmeters and spectral measurement instruments on the market. Gigahertz-Optik also offers laboratory recalibration (with multiple certifications) for all of their instruments to ensure that all their products maintain the highest possible calibration and traceability. In the end, this guarantees the most accurate measurements of spectral sensitivity and irradiance.