KeepingItLight
Flashlight Enthusiast
Call me the Missouri flashlight guy, but unless I see a runtime chart such as the one below, I will remain skeptical about any claim that a 1x18650 flashlight will hold its 1000-lumen output for an extended period. The Nitecore EC4, in the chart below, can do it, but it is a 2x18650 flashlight.
Several flashlights have been mentioned in this thread that do not have a step-down, per se, but that does not mean they have flat runtimes. Most/all of them slip into a declining direct-drive-like output after a short period at 1000 lumens.
Peak Beam intensity measured 28400lx @1m giving a beam range of 337m.
There is parasitic drain at 315uA which will fully deplete 3400mAh cells in 1.23 years.
Output on Turbo is never stepped down (partly due to the enhanced heatsinking provided by the die-cast body) and is well regulated for the entire runtime.
[Emphasis added.]
Several flashlights have been mentioned in this thread that do not have a step-down, per se, but that does not mean they have flat runtimes. Most/all of them slip into a declining direct-drive-like output after a short period at 1000 lumens.