Just finished researching over 200 models to pick the best headlamps for emergency preparedness. At this point in the headlamp market's development, there's no reason not to buy one of the models that can use either normal disposable batteries or the USB rechargeable ones. That kind of optionality is key in an emergency. The overall winner is the Black Diamond ReVolt. It's well-reviewed and often in the top 10 of other outdoor-oriented headlamp reviews, but usually #5 or so. But for prepping it has the right mix of features like red light night vision, spot and beam modes, battery life meter, lockout mode, waterproofing, etc. Best choice for spares/backups or cheaper options is the Energizer Vision HD+ at $15. Some other decent options too, like the $20 Petzl Takkina (which, like most Petzls, is frustrating because it lacks a lockout feature to prevent accidental turn-ons.) Do you have any favorites?