Small Light Sources

Light Source Characterization

Small light sources, such as bulbs or LEDs, may be characterized by a near-field model for use in optical design applications. To create this model, a precision goniometric system (SIG-400 Source Imaging Goniometer®) with a ProMetric Imaging Colorimeter takes measurements of luminance and color of the light source from multiple viewing angles. The measurement output is a Radiant Source Model™ (RSM) file that describes the near-field luminance distribution around the source. This RSM is supported by all major optical/illumination design software packages and is converted to a ray set using Radiant ProSource® Software. These ray sets support optical design, and allow you to extrapolate a near-field model into a far-field model.