A sun simulator is the most important measurement device in the solar industry. It measures the electrical characteristics of solar cells and modules at the end of the production process or in the field. In the industry, the discussion about using Xenon or LED is ongoing for years. The following comparison provides data, not only for the cost saving achieved by using LED but also about the measurement quality.
For a long time, the most common light source for a sun simulator were Xenon flash tubes. They have a spectrum closely matching the sun light, providing the means to measure the power output of a PV module without exposing it to the real sun light.