I've been using my headlamp, a Petzl Tikka, quite a bit recently. Last night it was put to a more domestic use while putting away laundry for the kids who had already gone to bed.
The light has three intensity settings and a strobe that is tons of fun when reading bedtime stories. For my uses, the lowest intensity is often plenty of light. Having the light mounted on my forehead makes it extremely easy to point the beam exactly where I want it as it inherently points where I'm looking.
It runs on three AAA batteries and I've been using my headlamp for 6-12 months on the first set with no signs of dimming. It only weighs a couple of ounces and wears comfortably for hours if necessary although I tend to wrap the strap around the light and stuff it in a coat pocket if I'm not using it continuously just to keep the batteries warm and to prevent loss.
The Tikka runs on LEDs so bulbs should never need replacement and for about $30US it should handle most, if not all, of your outdoor (and indoor) lighting needs.
Thanks for reading,