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Originally Posted by cjmarsh81
The forward voltage of the LED I used is 2.6V.
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Ah OK, I was assuming it was closer to 2.0V like most red LEDs, sorry. A 15 Ohm would do for alkaline batteries then, and (as you say), none for the NIMH.
I'd be interested in seeing charge pump circuit, shouldn't be too hard to add a switch and maybe do something about the 90V.
BTW, have you seen "the joule thief"?
http://www.emanator.demon.co.uk/bigclive/joule.htm