An Etendue how-to: A brief introduction to etendue in projection systems

DMD Optical Efficiency for Visible Wavelengths
http://www.ti.com/lit/pdf/DLPA083

Etendue is a geometric property of light that quantifies the throughput
capability of an optical system. This training explains this optical property
in detail, how to calculate it for various DLP DMDs and its effect on various
display light sources.




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