I read yesterday from memory that E1320 had run this flashlight at different currents with a single cell and there was no difference in light output running it at 3.8 amps from, I cant remember what amps he was comparing it to edit (found it, post 215 and 220 https://budgetlightforum.com/t/-/8279?page=4 ). Dont quote me exactly on this as I could not find it again. At 2.8 amps I would say that out walking in the bush that this light has a good usable light way past 200 meters. Stepped out at 250 long strides. I will have to see what this thing is like in comparison on the same track. I should of mentioned also that everytime you make a new pill with a different length to the standard item, a new battery tube mast be made to suit.