I use the Dorcy 41-4750... my first one has lasted 10 months now, with everyday use on my tool belt.
1) Uses 4 AA batteries- since I'm a big NiCad fan, I use re-chargeables, and they last at least 2 weeks.
2) Strong center beam with a wide cone around it. Perfect for service! So strong you can't look into the beam.
3) Lightweight- used to carry a 2-D Mag-light.