Malkoff M91 with a 16340 will give you about 500 lumens for 15 minutes. Not so practical but if you want a pocket rocket it’s a blast. Also will run on cr123 for about 100 lumens with a decent run time.
Personally not looking into Malkoff due to price range. But I do come across LFs often. LF does offer the single-cell (3-3.7V) D26 variant running at around 1.5A (previously 1.2A). They also have a tri-LED variant which yields very good area illumination IMO.Try Malkoff drop-in or Lumens Factory's.
Just one thing to note. Per LF, their modules have been tested and verified only on genuine SF hosts in stock form. So if you have clones, or legoed SF setups, any dimensional discrepancies could result in the failure of such modules due possible electrical contact issues. So be careful.I have an old 6P clone that I've upgraded several times over the years with Lumens Factory drop ins.