"Man-wai Chang" wrote in message
...
Yes if you use a 1.5V blocking oscillator.

http://cappels.org/dproj/ledpage/leddrv.htm

I want one that has the (over?) driver built into the LED...


Some time ago Elektor did a front cover freebie; a tiny PCB with a dedicated
LED drive chip and inductor for voltages down to 0.9V - that's probably as
small as it gets.

Can't remember details but if you google Elektor and click contact from
their home page, you can ask the editor.