Mod for Smallsun ZY-A4

I read somewhere on the forum that someone already try to mod this flood to throw flashlight. I'd like to change the original Q3 with an R2 led.
Someone have photo of the modding process (unmounting, etc.)
I try to unmount and it don't seem really difficult but this flashlight have a particular flood to throw mechanism and i don't want o make any damage.

I have to change the circuit (with another with higher current output) or i can use the same circuit?