The video below shows a machinist making a custom housing for
LED headlamp for a caver. Turn off the sound, as he is just babbling.
The design is very similar to the Phaethon.
https://www.youtube.com/watch?v=1foW9Rr8sFc
http://www.phaethoncavinglight.com/phaethon.html
There are all kinds of fancy caving lights now.
https://hackaday.io/project/20569-darkstar-mkii
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