Inexperienced people read on the box that a flashlight is very bright and happily buy it, they don’t know that brightness drops to half or a third after just 60 seconds! People don’t even imagine such an absurd thing! Except for Imalent, I have not seen any manufacturer declare the runtime of the turbo and the High in the specs. This is a real scam. Manufacturers are well aware that if they declare the duration of high levels of output, their sales will drop dramatically.
It is a truly ridiculous and dishonest question. Today many EDCs reach 3500Lm but only sustain them for a minute and they get hot. The Imalent MS03 claims 13000Lm but after just 45 sec. they drop to 2000Lm! What are the sense and the use of such a light? IMO it is a 2000Lm light! The same problem affects large flashlights with high output. Their large size and weight are justified only by their big output which however lasts for a short time. At the lower levels, all that mass becomes useless.
The sustainable light level is the most important element of a flashlight and should be stated first in the tables. The turbo is an accessory level, an emergency light that can be activated for short moments in case of need. A performance lasting one minute cannot be considered the flagship feature of a flashlight.
If you want a flashlight with a large sustainable output then you have to turn to HIDs. In the photo, the last image shows the Lemax LX70-SP beam: 7000Lm, over 4 Km (declared) of throw and 80 minutes runtime with no step-down. And the light doesn’t heat up in the slightest! But it costs more than $6000.
The only LED flashlight that can sustain the turbo with no step-down, that I know of, is the original BLF-GT, with huge mass and little output. But it works just with throwers where the essential element is the size of the reflector, much more than the output. Yet it is very heavy and bulky.