Learn more about Radiometry and photometry

What is radiometry ?

Radiometry is the measurement of optical radiation, which is electromagnetic radiation within the frequency range between 3×1011 and 3×1016 Hz. This range corresponds to wavelengths between 0.01 and 1000 micrometres (m m), and includes the regions commonly called the ultraviolet, the visible and the infrared. Two out of many typical units encountered are watts/m2 and photons/sec-steradian. Read More

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Quantities and units used in photometry They are basically the same as the radiometric units except that they are weighted for the spectra...