How to quantify beam shape? And discussions on many related topics: optics - TIR & reflector, thrower vs flooder, throw calculation, beam angle, cd/lm parameter, etc., etc. Did I miss anything? :-)

Flashlight Modding and DIY Parts
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This is a good article that I believe has been quoted a few times on discussions regarding beam behavior. I am no expert on this topic, merely grabbing screen shots of some of the slides that I found interesting, in particular how depth affects the beam.

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