What is the difference between laser headlights and LED headlights?

Huo Jing Optoelectronics Guide: Laser headlights have most of the advantages of LED headlights, such as fast response, low brightness attenuation, small size, low energy consumption and long life. Why does the US law reject laser headlights? Who is the strongest laser headlights and LED headlights? The so-called laser headlights are just auxiliary lights for LED headlights and high beams?

Most people's impressions, if exposed to laser light, the retina of the eye will be damaged, if the driver of the oncoming car on the road is illuminated by the laser headlights... the consequences can't be imagined - but this is obviously a misunderstanding The principle of laser headlights, laser is only the source of excitation of laser headlights, not a direct source.

Taking the BMW i8's laser headlight system as an example, the structure of the laser headlight can be roughly divided into four devices: a laser source, a mirror, a yellow phosphor filter, and a reflective bowl. The blue laser diode emits light, illuminates the mirror, is reflected by the mirror, and is focused to the yellow phosphor filter. The yellow phosphor absorbs the energy of the blue laser, produces white light, and then reflects it again on the reflective bowl. A conical white beam of focused illumination is illuminated to illuminate the front. Therefore, although the blue laser is emitted by the laser diode, the resulting white light is not a true laser.

Since the aurora diode can only emit monochromatic light and cannot directly emit white light, the structure and principle of the laser headlights on the i8 and R8 draw on the common practice of LED headlights, generally in the form of "blue monochromatic light + yellow The combination of a phosphor filter creates the white light we see. Although the principle of the laser headlight is similar to that of the LED headlight, the laser headlight has a light intensity of 1.7 times that of the LED under the premise of the same power, and the laser headlight can be made smaller than the LED headlight.

So what is the difference between laser headlights and LED headlights? ?

The pain point of the laser headlights: The laser is a point source. Although the range is far, but the range width technology bottleneck is the same as the laser probe used to test the distance between the moon and the earth. Point-to-point is the characteristic of the laser. Point-to-face is a problem.

The pain point of the laser headlights is two: the cost is high, and there are only some high-end luxury original car packages.

The pain point of laser headlights: the practicality of the modification of laser headlights in the aftermarket. LED headlights in the after-sales market, Huo Jingguang super concentrated LED headlights can achieve non-destructive replacement of halogen headlights to achieve the original high-definition night driving effect of LED headlights. To upgrade the laser headlights, it is a complicated process to install the laser headlights + LED headlights module. Moreover, the laser light and illumination intensity of the laser headlights, in the original high-end cars, even added smart lights to ensure the safety of the opposite side of the car. For example, the opening condition of BMW's laser headlights can be set above 40km/h, and the laser headlights will also be turned off in case of collision or extreme conditions.

Huo Jing Optoelectronics Science Summary: As the fourth generation of headlights, laser headlights are the improvement of the illumination distance and heat dissipation performance of LED headlights. At the same time, due to its inherent characteristics of intelligent and point-to-point light source, it is decided that the laser headlights will be an important part of the intelligent LED headlight module, rather than an absolute replacement relationship.