>... but, the point is that with only 1.7V drop on the LED, the other
> 3.3V drop is the bulk of where your battery power goes

True. I did suggest either no resistor, perhaps not advisable with
hindsight, or a low value resistor and PWM so that more power
is available as light. And way back when, a separate adjustable
duty cycle oscillator ANDed with the logic signals. That would
also protect the LEDs if code locked up

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