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How is light intensity and exposure measured?

April 26, 2017exposure intensity light measured

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How is light intensity and exposure measured?

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Caronmeasures light intensity using a calibrated radiometer. Photostability testing requires the measurement of light. Visible light intensity is measured in terms of Lux and exposure level in Lux-hr. UVA light intensity is measured in W/m2 and exposure level in W-hr/m2.