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Automotive Technology
AUTOS: BMW Aims For Laser Headlights
Bright, focused beams are seen as the next step in lighting development following LEDs; first application expected in electric car.
BMW unveiled laser headlights in its recent i8 electric concept car. (Photo: BMW)
Following the introduction of full LED headlights in its new 6-Series range, BMW is moving onto the next wave of advanced lighting technology for cars: lasers.
BMW engineers are currently working on the introduction of laser light in car headlights, the automaker says, with the aim of improving safety as well as efficiency.
Laser lighting is radically different from sunlight and from the various types of artificial lighting in common use today. For a start, laser lighting is monochromatic, which means the light waves all have the same length. It's also a “coherent” light source, which means that its waves have a constant phase difference.
As a result, laser lighting can produce a near-parallel beam with intensity a thousand times greater than that of conventional LEDs.
The high efficiency of laser lighting means that laser headlights have less than half the energy consumption of LED headlights, in the end helping to save fuel. Whereas LED lighting generates only around 100 lumens (a photometric unit of light output) per watt, laser lighting generates approximately 170 lumens.
Additionally, laser lighting diodes are very small. With a length of just ten microns (µm), laser diodes are 100 times smaller than the square-shaped cells used in conventional LED lighting, which have a side length of one millimeter. This opens up all sorts of new possibilities when design cars.
There’s no risk to humans, animals or wildlife when used in car lighting. BMW says, because the light is not emitted directly but initially converted into a form that is suitable for road traffic. The resulting light is very bright and white.
The technology is expected to debut in production form on the upcoming 2014 BMW i8, and it has been previewed on the i8 Concept. Note, laser lighting is already used in a variety of consumer products, namely CD and DVD players, though in most cases it goes unnoticed by the user.
BMW engineers are currently working on the introduction of laser light in car headlights, the automaker says, with the aim of improving safety as well as efficiency.
Laser lighting is radically different from sunlight and from the various types of artificial lighting in common use today. For a start, laser lighting is monochromatic, which means the light waves all have the same length. It's also a “coherent” light source, which means that its waves have a constant phase difference.
As a result, laser lighting can produce a near-parallel beam with intensity a thousand times greater than that of conventional LEDs.
The high efficiency of laser lighting means that laser headlights have less than half the energy consumption of LED headlights, in the end helping to save fuel. Whereas LED lighting generates only around 100 lumens (a photometric unit of light output) per watt, laser lighting generates approximately 170 lumens.
Additionally, laser lighting diodes are very small. With a length of just ten microns (µm), laser diodes are 100 times smaller than the square-shaped cells used in conventional LED lighting, which have a side length of one millimeter. This opens up all sorts of new possibilities when design cars.
There’s no risk to humans, animals or wildlife when used in car lighting. BMW says, because the light is not emitted directly but initially converted into a form that is suitable for road traffic. The resulting light is very bright and white.
The technology is expected to debut in production form on the upcoming 2014 BMW i8, and it has been previewed on the i8 Concept. Note, laser lighting is already used in a variety of consumer products, namely CD and DVD players, though in most cases it goes unnoticed by the user.
Toyota FT-86 Open Concept
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