This Lego build will get you there with little-to-no compromise;
Malkoff Bodyguard v.2 head - 1,000 lumens/approx. 12,000 candela on high (eight seconds) then it drops to low (250 lumens), head measure 1-inch in diameter. Sign up for the newsletter and get 20% off your first purchase. Out of stock items are replenished within a week or two.
Lumens Factory E-Series clone body - can also be found on their ebay store
Lumens Factor E-series twisty tailcap - can also be found on their ebay store
16650 2500mAh rechargeable cell and a suitable charger (like
this one).
You'll also be able to run this light on two CR123A batteries.
@
Clusterfrack and @
BillSWPA also run the Bodyguard lights, perhaps they can chime-in as well.
This is my version of this light using a SF Lumamax body found on ebay with a
Malkoff E-series tailcap. AOL as shown is 5-1/8" would be about a quarter inch shorter with twisty tailcap. This is one of my favorite lights, rides clipped in a front pocket unnoticed;
Option 2
This is a P-series light so it's a little wider in diameter; body is 1-inch and head is 1-3/16" ;
Malkoff MD2-M61HOT - 740 lumens/20,000 candela. It's a one mode light but is available with a high/low bezel switch (loosen bezel for low). Low is only about 5 lumens though.
Surefire Z41 twisty tailcap - common on ebay, here's
one listing
IMR 18650 flat top cell - you would need to use
this specific cell, protected cell is too long to fit in body when using SF twisty tailcap.
AOL with twisty would be 4.75 inches, not including the rubber button. It would look something like this (the shorter one, both with a
Raven Concealment pocket clip);