1. Malkoff M61N
I don't use it nightly any more, and it's in a MD3 with hi/lo ring right now, but my Malkoff MD2 with original M61N drop-in had thousands of hours of use from >8yrs of being my primary light source on my night shift job before being replaced by a newer and brighter Malkoff.
This light has been dropped on concrete and steel grating many times over the years from doing stuff with the light in my hand without taking time to use its lanyard. The wear around the front edge of the bezel looking almost uniform is due to using a file to smooth out the gouges.
2. Malkoff M60WLF
The >12yr old M60WLF was recently moved to a MD2 host, but started out as my EDC in a bored SF C2-HA, then was switched to the Malkoff VME head on a SF E2D body, where it stayed for quite a few years.
I still use it regularly.
3. Zebralight SC52w
My EDC for about the same amount of time as the M61N was my work light, >8yrs. The edge of its bezel has also seen a file a time or two.
Like the M61N, it was replaced this past winter with a newer model(SC64w HI).
These were 3 of my only 4 handheld lights for most of a decade, before deciding to upgrade everything.
Honorable mention to the Zebralight H52Fw bought around the same time as the SC52w. Not a nightly user, but my hiking/backpacking light that still sees 100% of my use in the woods, unless I bring another light to play with.
Definitely got my money's worth from all 4:thumbsup: