An integrating sphere is an excellent tool for producing a highly uniform distribution of light. Integrating spheres are also used to measure many types of light sources, including LEDs. Light rays are introduced into the interior of a spherical shell, where they repeatedly scatter until they escape through a circular exit port cut through the shell. This tutorial will show you how to: • Create the integrating sphere with a circular exit port. • Create a detector surface outside the exit port. • Add a surface property to the TracePro property database. • Assign the new surface property to the integrating sphere. • Perform a simple raytrace with and without importance sampling. • View the results on an irradiance map, as well as in tables.