I have one of these and they are scary, it's like having a shaft of sunlight. I think you could temperarily blind someone with it. On widebeam you can easily light up the front of a house, on narrow beam it throws a light for a couple of hundred yards.
They are strange in that the narrow beam is rectangular showing the shape of the LED. The light is like a projector light, pure white.
There are Uk sellers too, about £8.00 delivered.
This one is rated at 300 lumense 5 watts, they also do a 500 lumens version, I think you would pay ffor that in diminished battery life.
I paid nearly £40 for the pro lenser head torch, this one blows it out of the water.