How hard is building my own light?

[MascaratumB]

I’d say to you to look at this post/thread and eventually get in contact with gchart.

AA Flashlights - "Cockroach" / "Vampire" / "Drain-me-till-I'm-empty"

A member here approached me about making a low output, long runtime boost driver to fit the Convoy T2 (aka Manta Ray S1, also available as a host at Kaidomain). Target output was ~1 lumen. No mode switching. Currently 17mm but could be made to be 15mm or about any size. I went through a couple iterations and ended up creating one that ran an XM-L2 at 2.5mA for ~0.7 lumen for 98 hours on a 900 mAh AAA Eneloop Pro. So on a AA battery, it should run for 12+ days. It runs down to ~0.7 V. Current i…