See now, this is where being rich (even dealing with budget lights), would be nice. :) One of us could buy 50 budget lights and waste a whole night doing beamshot comparisons. That would be AWESOME.
Hope you enjoy you’re keychain light… I love mine, it’s by far my brightest light and best thrower . Will you use alkalines in this beast or will you stick with eneloops. Does you’re tk41 have a donut hole? Mine does.