Dave Plowman (News) wrote:

that 400w includes headlights. And very few cars have LED
ones. HID are more common - and vastly more efficient than tungsten. My 35
watt units produce much more light than 55w halogen. I'm not sure how LED
compares to that.

The top-end Audis have optional LED headlights, it mentions 40W per unit
for the dipped beam, but doesn't state the wattage for high-beam.