As far as i know David, the HDS is limited to 1a which is pretty much the safe limit of a CR123 cell.................of which the light is developed around. Its no barn burner and never will be, not too long back(10yrs or so) 60lm was the bees knees. 200-300lm is ample for most and it gets Henry his caving run times. It has been pretty much done to death with output, quite a few feel the same. CPF is a super small part of Henry's business here and afaik , he has no plans to change his bullet proof light.
I have the 200lm rotary, i also have lights that can hit 4000lm with not much size difference(for seconds and resulting in aggressive step downs and very warm hands!). The HDS is a purchase for someone who wants that tank of a light, clever efficient driver and great UI. Unfortunately, if WOW output is wanted, HDS is not the light for you. The reflector and 200lm puts out an adequate beam and impressive. Each light is calibrated so 200lm or 350lm is exactly that. Not exaggerated figures from many chinese manufacturers. So maybe one could argue the 350lm HDS is more like a 6-700lm nitecore
My advice would be try one, if its not for you, sell same day! The UI and feel in hand really makes it a special light. But those are just words, try and maybe you will find out why HDS has such a strong following, even if the output is less than many available lights.
Lumens are awesome, but when it comes to just getting on with a job, 100-200lm is more than adequate for me (subjective as with everything i have wrote!)
All 16340 fed lights, lots of size and output differences here...............nothing can replace the 200 hi cri rotary imho