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+===== Notes on Practical Photometry =====
+==== Radiometry and photometry units for image and vision sensor developers ====
+(relating chip illumination to scene illumination)
+See these {{https://drive.google.com/file/d/0BzvXOhBHjRhec01DUDRxb3M4dE0/view?usp=sharing|Notes on practical photometry}}, written based on work in the [[https://www.ini.uzh.ch/~tobi/bipImager/index.php|Pulsed-Bipolar imager project]] carried out at Synaptics, Foveon and National Semiconductor around 1997 and periodicaly updated.
+There is a magic formula relating chip illumination to scene illumination explained (albeit very concisely) and the error that existed previously is now corrected (March 2017). These notes also explain photometry units: nits, candela, lumens, lux, and they relate incident illumination to luminance of a surface. They include a few actual measurement results comparing lux and nits, and a candle measurement.