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Worldwide: Audi introduces laser headlights; follows BMW's lead
Audi Sport Quattro concept car
BMW also has introduced laser headlights, on its electric supercar i8.
The headlights use laser diodes to energize a phosphor that creates white light. According to Audi, the beams have a range of 1640 feet, twice the distance of LED high beams.
Technically, the white-light beam would not have the same coherence as a laser, making it safer for human vision (at least, at normal driving distances -- any very bright light viewed up close could be an eye hazard). An Audi spokesperson said “Our main aim was to not dazzle any drivers, laser technology is much more accurate.”
Because the laser diodes are so tiny -- only a few micrometers in diameter -- the headlight assembly itself can be made smaller as well.
Closeup of the Audi laser headlights
The laser power appears to be about 10 watts, based on an Australian report that “the system is 10,000 times more powerful than a laser pointer”. Such pointers in Australia are limited to 1 milliwatt or 1/1000 watt. It is unclear if this refers to the total power of both headlights, or of a single headlight.
From Car and Driver, and News.com.au. MotorTrend has an excellent article from 2011 describing in detail how the BMW laser headlights work. It contains an account where journalists looked directly into the light without adverse effect.