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If you just want to solve the problem, go buy a LED headlamp. There are now quite a variety available on the market. A bunch of years ago this wasn't the case, and I built my own. It drives 4 wh...
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#1: Attribution notice removed
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System
·
2020-06-03T15:54:13Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/3167 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/