In a freezing workshop, I did some measurements on a Gaggione LLC07N collimator in a bike light I made a long time ago, after replacing the original ancient led with a Cree XP-G. The distance between the white screen and the lens front is 1600mm. The three tiny spots in the beam (photo below) are ...
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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/sometimes-numbers-work-well-2018-03/
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