Peak Eiger without QTC?

[parnass]

...
Here it is with the 1.6 volt alkaline next to a high CRI HDS rotary on level 16.
I will start runtime test soon.

I cannot see the image you posted. It probably requires one to login to Google or somesuch for viewing.

 

[Tre_Asay]

That should be fixed now, google keeps changing settings.
Anyways I did a runtime test of 36 hours and the battery was at 1.13 volts after. It was surprising as the flashlight was still giving off a fair amount of light and I could not tell if it has dimmed much.
This should make a great backup flashlight as a pack of batteries would be worth months of light, plus as it has no problems starting at lower voltages it should make a great joule thief for scavenged batteries. :candle: