To remove your personal information from the web, visit https://joindeleteme.com/ACTIONLAB20 and use the code ACTIONLAB20 for 20% off. For international plans, please visit https://international.joindeleteme.com
Flashlight I used: https://amzn.to/3Lj2fM3
Good summaries of Etendue:
https://www.mikewoodconsulting.com/articles/Protocol%20Winter%202012%20-%20Etendue.pdf
https://what-if.xkcd.com/145/
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brightest flashlight, the action lab, MS32, Imalent MS32, World's Brightest FLashlight,
