8+ years ago, I bought a Petzel Zipka (I think) which has a retractable cord instead of a headband. I'm still going with the original batteries. It weighs 2 oz and is very compact and take it with me every trip.

It's helpful whenever I tuck in at night, and or awake before morning. It's great for middle-of-the-night potty runs so I don't trip over mine or other's tent cord, and it's always useful for adjusting my tent thru nightime storms and checking out things that go bump in the night. It's a basic safety item for me.