Solar irradiance is the number one factor in weathering and photo degradation tests

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Sunlight, either direct or through window glass, is the most important weather factor. The photons, spectrally distributed over UV and longer wavelength regions are responsible for the photo degradation.

Understanding the fundamentals of solar radiation is critical to performing proper weathering and light fastness testing.

In this Technical Guide you learn about:

  • Terminology, definitions, units
  • Solar spectral irradiance distribution
  • Normalization and reference spectra
  • Radiant exposure in Florida vs. Arizona