I have a few, but this one remains the most unique and dedicated to a specific use;
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Malkoff E2XTD head on an Oveready E35 body, a SF Z41 tailcap with ZeroRez insert powered by an IMR 18500 cell. Operation is squeeze in a cigar hold for momentary operation, accomplished by backing off the tailcap just a bit from constant on.
This is strictly a defensive use light which at 70k candela will temporarily deprive someone of their vision in a low-light environment. A lot of intensity in a small package.