I love LED flashlights because they tend to use less batteries and are a bit more compact than flashlights of the past. Remember the large Maglite flashlights with D batteries? As much as I like the flashlight doubling as a potential weapon, I prefer the smaller sized flashlights.
The SureFire UB3T Invictus flashlight blasts a full 800 lumens on the highest setting. You won't want to spend too much time with the UB3T on it's highest setting as it will only last 1.7 hours before the batteries die. There are 8 selectable brightness levels, the lowest setting will give you a full 150 hours of light.
The Invictus is machined from high-strength aerospace aluminum, has a battery gauge, and a strobe feature. All this can be yours for $385, ouch.