Well OK, and certainly thanks. But it still doesn't make sense. Look at this multi-mode C3:
https://www.candlepowerforums.com/posts/2207113
A light rated to take up to 4.2v.
Give it 1.2v and somehow it boosts enough to deliver 25 light units. The circuitry boosted it by over 100%, by at least 1.8v
Give it 2xaa, somewhere between 2.4 and 3v and it outputs more like 53 light units.
Give it 3.7v and it outputs more still, something like 68 light units.
So, what's this thing doing? It ain't boosting by percentage, if it doubled the 3.7V it would be over. And it ain't boosting by a consistent amount of volts, I don't think, or the 3.7v cell would have stuffed 5.5v into it and poof!
so I'm left with some kind of curve, but why? If it could boost 1xaa by at least 1.8v it could have pushed the 2xaa to at least 4.2v, and that's more then the 3.7v. Or am I to think that it can boost to over 4.2 on the output. If so, there has to be a limit to what can be done, but the light states it can accept a 14500, so..
I can only assume this light is both boost and buck (in a $20 light?) And I must next assume it somehow gates current delivery based on input voltage (why else is the 2xaa not deliverying full light output?).
But is this a reasonable assumption? Or a better explanation?
My thanks to all that take time to consider,
dan