I find this an interesting light. But I am not impressed of the stated runtimes. Compared to, for example, Fenix TK21:
Olight i6: 80lm for 5,8h, 420lm for 1h
Fenix TK21: 172lm for 5h 10min, 449lm for 1h 50min.
I know that there are difference in efficiency between different drivers, but the differences seems to be too big, both have an XM-L emitter, and TK21 has around twice the performance...