I have a small 2xAAA, 3-5mm-LED light (this one) that has no driving circuitry whatsoever - it just hooks the LEDs straight to the two cells. This, of course, gives abysmal output.
I'm looking into building a small circuit to drive the three LEDs at about 30 or 40 mA each from fresh cells. Now, I know how to build a joule thief, but the stock design is only good for 1.2/1.5V input and output for one LED.
How do I modify it so that it works for my application?