Wife "requesting" I sell a few things before I make any more purchases.
I have a Ptech Byte headlamp FS.
It runs off 2xAAA batteries, 42g or 66g with batteries, White light, red LED, lock switch that lets you store it away safely with the batteries inside (I just leave it in my pack.)
Purchased 2016, it's seen a lot of miles but not much use - I've never actually needed to change the batteries.
$20 + Shipping est 10 AU wide.
https://imgur.com/nIkAp8P