Auto Express test process:
Auto Express tested a total of eight lamps, all of type D1S. This type is installed primarily in relatively recent models. The test took place in the light tunnel at OSRAM’s xenon lamp centre in Berlin.
Auto Express on the test process: "We used the same formula as we do for rating halogen bulbs, combining output measured at 50 and 75 meters in front of the car on dipped lights to get a beam rating. These D1S bulbs have their own built-in igniter, and were burned in for four minutes to give a stable output. An average of two bulbs formed the rating."
News: XENARC NIGHT BREAKER UNLIMITED - winner of the AUTO BILD xenon lamp test 2015