Hi!
looking at your review (review: nitecore TM16 - final!), the driver uses MP2380 step down converter (http://datasheet.octopart.com/MP2380DN-LF-Z-Monolithic-Power-Systems-datasheet-13697575.pdf).
I see only voltage control (not current) in this converter. So probably you just need to adjust the voltage devider to higher voltage?
It seems to me that R207 and R206 (precise resistors 100 and 150Ohm , may be i’m wrong) are the part of voltage divider, may be there are some more resistors (I dont see those on pictures from review).