How to Calculate Irradiance of Xenon Arc Tester

In optics, irradiance is the power per unit area of electromagnetic radiation incident on a curved surface. Radiant emittance (radiant exitance) is the power radiated from a surface per unit area. Using the International System of Units, the units of these physical quantities are watts per square meter (W/m2). Irradiance is a crucial parameter in the Xenon Arc Tester. Many people will be curious about its calculation. Here is an introduction to how to calculate it.