Electric bicycles are equipped with LED headlights. Why do cars still use LED headlights as gimmicks?

There are actually several reasons for this problem! The first reason is factory production. In order to make a profit, many manufacturers don't install led light sources, so an electric car can earn 50 yuan, and there are many cars produced by manufacturers, so the profits are also considerable, especially some protective parts of LED light sources. In order to save money, as long as the function of light source is realized, manufacturers will no longer install those protective components, and earn a penny for every penny earned.

For example, many electric vehicles in our market are replaced by led lighting, which is energy-saving and beautiful, but the heat dissipation of LED lamp beads and lampshades is definitely more expensive than halogen lamps and hernia lamps, so this is why only high-end electric vehicles will install LED light sources. The price of cars and electric cars with LED light sources is much more expensive than that of cars with halogen lights, so although the cost has increased, the profits that manufacturers can earn are higher.

Moreover, the driving speed of electric vehicles is slow, and basically it is enough to light LED lights, while the requirements for installing LED lights on cars are much higher. It is necessary to ensure not only the width of light, but also the range of light, as well as a series of problems such as penetration, concentration, brightness and service life in rainy and foggy weather, so this greatly increases the cost of LED lamps. Of course, LED lamps also have the advantages of energy saving, slow light decay and high brightness, especially the service life of high-quality LEDs.

Therefore, although both of them are equipped with LED lights, their manufacturing costs are quite different. For example, cars have to adjust the number of light sources and lenses in order to ensure the brightness and penetration of LED light sources. This part of the cost is still very high, especially now many car companies make headlights feel as complicated as science fiction, and the manufacturing cost of an LED light source in the car is often more expensive than that of an electric bicycle!

I believe riders have understood that although thousands of electric vehicles have installed led light sources, they are still different from the LED light sources on cars, which riders should know. Why do you think this is?

Many people may think that this is the true face of LED car headlights. I can only say that it's not that simple. Most of the LED lamps sold in the market now are similar to this, and this form is only an alternative, just like the incandescent lamp used in our family before, and now it is replaced by LED bulbs, which is a replacement, not a real LED car headlights.

Let's calculate the cost of the LED lamp shown above. The approximate bill of materials is: a lamp board (copper-based)+two lamp beads (calculated by CREE)+middle heat-conducting copper sheet+aluminum radiator+fan+drive module+other fasteners, all made of good brand materials, and the calculation cost does not exceed 100 yuan. The electric bicycle mentioned in the question also uses this kind of lamp, and its material may be worse and the cost will be lower.

Real steam lamp LED headlights need to be matched in optical design, thermal design, structural design, electrical control and service life. I have read an article about disassembling Citroen C6 (parameter | picture) LED headlights before, and I can get a general understanding of its internal structure.

On the LED control unit, you can clearly see the dense convex columns, which are metal materials used to increase the heat dissipation area.

The high beam and the low beam are separated and equipped with special reflective cups and lenses.

Disassembly begins like this, consisting of lamp beads, circuit boards, radiators, reflective cups and lenses.

In order to solve the heat dissipation problem of LED headlights, it is necessary to add active heat dissipation to the metal radiator, that is, the fan (a better fan can offset the total cost of a replaceable LED headlight mentioned above). This is Citroen's LED headlight assembly. If you switch to Audi, BMW should be more complicated and costly.