I'm still learning about the device tree in general and am definitely fumbling about a bit.
Pi Zero W draws basically zero current when shutdown with
sudo shutdown now. After adding the line
/boot/config.txt, the current drawn actually increases after shutdown, from around 80mA to around 140mA.
I wish to have a led turn on as soon as the PI is booting, and then turn it off in my program when all processes are ready. The above line was the most promising solution I could find for making the led turn off on shutdown, and on immediately after power on.
My PIs are going to be battery powered, in a situation where physically disconnecting power may not be particularly practical. Using a relay may be possible, and necessary, but for now I'd like to know if a solution exists to avoid power consumption after shutdown.