This post is for the cavers that like to make things themselves.
Below is a product sold at Academy Stores in the boating section
http://assets.academy.com/mgen/21/10329821.jpg?is=500,500
It is probably to heavy to rig as a primary light source on the front of the
helmet. But could be rigged in some way for photography. You would
have to design and build your own switch and battery pack.
There are similar products in other stores, but this one comes with a
bracket that would easily mount to a helmet or a tripod.
I would think commercial cave tours could use such a product to light up
remote areas of the tour, where they could use a 12 volt system.
Cavers could also mount it to their vehicles in various places.
David Locklear
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