Spatial Differences in Light Output
                                                                                         
Spatial Differences in Output

Integrating spheres are used to measure the total output of radiation sources for a variety of reasons.  The benefit of using an integrating sphere or goniometric system is their ability to measure the total output of a source independent of spatial differences in output.

Spatial differences are important to understand when determining how to position the device under test and if mounting the source inside the sphere is necessary.

Sources with beam patterns that are narrow, such as lasers and some LEDs, can be accurately and repeatedly measured by mounting them to an external port and pointed into the sphere.  Sources with divergent beam patterns should be mounted in the sphere to ensure complete integration of the signal and accurate measurement.
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