Since I bought a bike for my girlfriend, I've been loaning her my (expensive) lights. I'd like to get her a set of lights of her own. The tail light is easy, it'll be a PB SF, PDW Danger Zone, or PDW Radbot. They all have good runtime and decent performance.
So, I need the equivalent features in a headlight. I've owned a few PB Blaze headlights, and they always quit working. AA or AAA battery use is a requirement. It needs to be less than $50. It can be a "be seen" light, as she's really only doing neighborhood riding, and we have street lights.