Is there any one who can teach me how to calculate the run time of a given flashlight

[Minos2014]

Is there any one who can teach me how to calculate the run time of a given flashlight

what kind of parameters should i know before i start to calculate the run time .

1:The capacity of battery
2:current of the driver
3.......?else

 

[Norm]

:welcome:
There are many existing threads, please continue in the thread of your choice How to calculate the run time.

Or try Run time Calculator - Norm