for me, one of the custom Mako lights (Mako Mark II HO in particular)

why? its small, light weight, ultra reliable, always on me, extremely long running, uses easy to find batteries, simple to operate. its wasn't cheap but the best things never are.

the Mako i own has:

-bomb-proof titanium construction

-is ultra reliable

-super efficient electronics/LED for extreme run time

-21-lumens for 5-hours, and 3-lumens for 80 hours, when using a 1.5V disposable lithium battery

-can use alkaline, primary lithium or rechargeable NiMH (eneloop) 1.5V AAA battery

-lack of breakable glass "cover" lens

-ability to tail-stand

-simple two-level output with lots of twist between them

-ultra-light weight

-long threads requiring over two full turns before engaging the contact (to keep from losing the head)

-very smooth neutral white flood beam

-one-handed operation

-very smooth threads

-smaller than a Chapstick


so, i have little use for: unreliable units, ultra-bright, short-runtime, specialized-dangerous-high-voltage-rechargeable-batteries, lights i don't always carry, lots of fancy modes like strobe, any additional buttons/contacts that may corrode, or lowest-bidder construction quality.

while the mako is hard to come by, there are others much like it that are readily available.

shown here on the left, among my edc tools: