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@Gordon
That's a hard one - you'd have to test - I think it'll depend on the brightness.
analogWrite(LED1,0.99)will certainly use more power thandigitalWrite(LED1,1).There is hardware PWM, but it requires the high-speed oscillator to be on - which will use power even though the processor is asleep.
If you want a dim glow, by far the most power efficient way would be doing
pinMode(LED1,"input_pullup")since then everything can be properly asleep.