I have Lightforce 50w HID on the front of the UG and they are rated to a couple of kms. I can tell you they are bright enough over length that you loose the fact there is a car in front of you and blare passed them until you engage the rear reflectors of the car then you feel bad. What is really average though it you then dip the light 1.5kms behind them and drive in the bloody dark until you catch them and overtake.

Our Vendor LEDLightCo sell a light very similar to the first link but without the defuser for spread. Spot down teh centre and the smaller LEDs for spread.. I was in there today, they look Sik!!