I wasn't aware of any Halloween 'tradition' in my country. Porchlights? In my neighbourhood it's merely kids' excuse to play dress up and (hopefully) acquire free candy.
Yes, there is no real tradition to speak of here. The outside lights being lit is supposed to signal availability. If it's on, kids are welcome to come knocking. If it's not, then they are not. Or so it has been said. It is not being followed. Everyone around my parts knock on every door, light or no light.