Well, the title pretty much says what I want to do. Even if the DS213+ is on top of a living room cupboard, it’s still way to bright .. as I don’t need really need the LED, here’s a quick hack (the ID and the device is taken from the Synology Wiki) on how to disable it on each startup:

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#!/bin/sh

case $1 in
        start)
                echo "Disabling Power LED"
                echo 6 > /dev/ttyS1
                ;;
esac

Just place the file in /opt/etc/init.d/S01leds and the script is gonna turn the LED off during a boot/reboot.