In article , Bob Robinson says...

I'm working on a similar project at the moment. Here's what my research
has yielded so far. The majority of ultra bright leds do operate in the
20-40ma range, and the forward voltage is around 1.5-1.7V.

Agree on the questionable lifespan for the batteries, but
my experience with the white leds is, they're really blue
ones with a bit of yellow phospor. As such, they have
higher (four volt-ish IIRC) turn on voltages.

Jim

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