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On Sun, 2 Nov 2025 21:34:46 +0100, Carlos E.R. wrote:

> Those big torches with big batteries should power something with 3000
> lumens.

https://hackaday.com/tag/cree/

The problem with retrofitting a Maglite is the Cree emitters need controllers and heatsinks. Those are the expensive replacements.

https://www.instructables.com/LED-Maglite-CREE-XM-L-Modification/

That's a DIY  Here's a commercial module.



https://lumencraft.com/home/158-3500-lumen-3x-xhp50-dropin-bulb-for-magltie-6-d-cell.html

https://www.candlepowerforums.com/threads/maglite-led-or-cree-maglite-upgrade.398018/

Nice write up discussing the cheap drop-ins versus high output.