Many other manufacturers like olight or Acebeam writes e.g. 5 + 200minute or similar for the output of 7000 / 1500 Lumen. So from other flashlights you can clearly see the stepdown.
If you look at the output levels and runtimes, yo see with little math that there must be a stepdown.
Output: 1100LM, 6800LM, 11526LM
Runtime: 4.7h, 4h, 3.5h
The ratio from 6800lm for 4h to 1100lm for 4.7h does not make sens, if it has no stepdown.
Sorry, that you have to learn it that way.
I think the best solution for you would be to build a flashlight with large 100W cob-led, a big passive CPU Cooler and a lipo-battery.