The claimed high output and the claimed smallish battery capacity (for the runtime and output) are incompatible statistics. Something about this is badly overstated. I suspect it’s both the output and the runtime. And maybe the battery capacity, too.
@werehatrack While there are brands with “honest” specifications, this probably isn’t one.
With quality components, these specs are actually easy to meet while complying with a common industry standard. Under that standard, the lumen output is only measured once, 30 seconds after the flashlight is turned on. The light is allowed to get much dimmer after that and still advertise the peak brightness.
In the real world, the most cost effective way to get a flashlight that will consistently produce a constant 3000 lumens for 3.5 hours, is to buy a dimmable 10,000 or more lumen work light, that works with cordless tool batteries that you already own and use. Lights that are run at a fraction of their maximum brightness can last for years without a noticable loss of brightness.
Cordless tool batteries and chargers are a considerable investment, so this doesn’t make sense if you don’t already own some.
@caffeineguy It’s been demonstrated that the actual output of the vast majority of high-claimed-output LED illumination devices on Amazon (and elsewhere) is around two percent of the stated level at power-on, and falls from there. I suspect that this one’s actual output is closer to 400 to 450 lumens at 30 seconds, and the high-setting runtime is more credibly closer to two hours. I sincerely doubt that the light level hits 3K at any time. If the single 18650 inside really has that (impossible according to honest-manufacturer published specs) 4Ah capacity at ~3.6V, the cell has a total of 14.4Wh of power to deliver. But 3000 lumens for three hours requires a power consumption of not less than 27W continuously, so that battery cannot possibly provide the power to run a 3000 lumen output for more than about 30 minutes. More probably, I suspect that the battery has a capacity closer to 1.6Ah, the LEDs have an output around 450 lumens initially and falling to about 300, and the runtime on the high setting is about two to two and a half hours.
For purposes of comparison, I have an LED lantern whose actual 30-second-after-power-on output is around 1600 lumens, and its high-setting runtime on its internal two-18650 pack (rated at 2.2Ah each) is about 110 minutes - but it also has a four-D cavity which, if populated, gives it a runtime of more than six hours total.