Lithium Battery Pack,6V Lithium Battery Pack,6 Volt Lithium Battery,Crv3 Lithium Battery Jiangmen Hongli Energy Co.ltd , https://www.honglienergy.com
Laser headlights have many of the advantages of LED headlights, such as fast response time, minimal brightness degradation, compact size, low power consumption, and long lifespan. However, why does U.S. law prohibit their use? Which is more powerful between laser and LED headlights? Are laser headlights just auxiliary lights for LEDs or high beams?
Many people think that exposure to laser light could damage the retina, and if a driver oncoming is hit by laser headlights, the consequences would be unimaginable. However, this is a misunderstanding of how laser headlights work. In reality, the laser is just an excitation source, not the direct light output.
Take the BMW i8's laser headlight system as an example. The structure consists of four main components: a laser source, a mirror, a yellow phosphor filter, and a reflective bowl. A blue laser diode emits light, which illuminates the mirror, reflects off it, and is focused onto the yellow phosphor filter. The phosphor absorbs the blue laser energy and converts it into white light, which is then reflected again by the reflective bowl, creating a concentrated white beam for illumination.
Although the blue laser is emitted from the laser diode, the resulting white light is not a true laser. Instead, it’s similar to the way LED headlights produce white light—by combining blue light with a yellow phosphor. While the principle is similar, laser headlights offer 1.7 times the light intensity of LEDs at the same power level and can be made smaller.
So, what's the difference between laser and LED headlights? One major challenge with laser headlights is their point-source nature. Although they have a long range, spreading the light evenly over a wide area remains a technical challenge, similar to the limitations of lasers used in space exploration.
Another issue is cost. Laser headlights are currently only found in high-end luxury vehicles, making them inaccessible to most consumers. Additionally, modifying existing systems in the aftermarket is complex. Unlike LED headlights, which can often be upgraded without major modifications, installing laser headlights requires integrating a laser module along with LED components. This process is not only complicated but also requires advanced smart lighting systems to ensure safety, such as automatically turning off the laser in case of collision or extreme conditions.
For instance, BMW's laser headlights are designed to activate only above 40 km/h and will shut off in emergencies. As the fourth generation of automotive lighting, laser headlights improve upon LED technology in terms of illumination distance and heat management. However, due to their intelligent and point-source characteristics, they are more likely to be integrated into smart LED modules rather than replacing them entirely.