Hm. Okay.
The setup with the least power lost is with a 12V battery and as many LEDs in series as I can fit. I did a quick calculation and got that the battery wouldn't even last an hour, though. (12V battery that I'm using has 55mAh or something teensy, and the circuit setup has a current of...
They're white LEDs, which I believe are functionally the same as blue ones anyway, right?
I know series is more efficient, but I'm trying to maximize the battery life while minimizing power loss. With a low-voltage battery (which is really going to be multiple AA batteries together), I have...
I'm making an array of 11 3.3V LEDs, and I've got multiple various setups possible depending on source voltage (batteries supplying either 6V, 9V, or 12V) and whether I decide to put a bunch of the LEDs in a combination of series/parallel or all in parallel.
I need to maximize battery life, so...