A one watt LED is equivalent to a 1.25 watt halogen is equivalent to a 0.5 watt H.I.D.

Please check the base post on the light selection guide sticky. This is all explained. The comparsons with a one watt Luxeon LED is way off the reality. The Luxeon emits about 25 lumens, my halogen emits 1000 lumens, and a HID emits about 600 lumens. A Luxeon rates as a blinky on my bike. A rider with a 3 LED light showed up on a club ride last March. The three other riders had lights 50 to 100 times as powerful.