High brightness LED brought many compelling features to car manufacturers. In spite that most of these features were derived from the working principles and similar production process of LED indicators-products are much older than themselves and well-proved.
LED taillights, LED signal lamps, LED working lights, LED brake lights can overcome shortcomings that much common in incandescent lights. Usually, vehicles will meet with frequent moderate shocks and vibrations, which may probably cut down the service life of incandescent lamps. Besides, the instantaneous surge current caused by temperature coefficient of filament resistance will accelerate the destruction of bulbs. Thermal loop-an important feature of break lights will definitely shortened the service life of incandescent lamps.
The instantaneous surge current generated by incandescent bulbs made the circuit protection and fault detection be more complicated. Automobile manufacturers have to set the fuse rating and the fault detection threshold large enough, to adapt the inrush current magnitude and duration without causing fuse blows failures or detection failures.
In contrast, when cars in shocks and vibrations that in the normal range of amplitude and frequency, structures of high brightness LED would be much stronger than incandescent bulbs. LEDs have compact structures (small sized) and light weight, which can reduce the mechanical torque generated by shocks and vibrations. The compact construction of high brightness LED contributed to the flexibility in the design of vehicle lighting applications. Within such limited space, designers hope that each compartment can meet the requirements of the overall design of the car. For example, some small cars would not set the CHMSL (Center High Mounted Stop Lamp) module in the rear cover. Instead, manufacturers made use of the feature of compact construction of high brightness LED and embedded them into trunk lids.
Designers also found out several problems about automobile taillights and the control system. These problems were also emerged in other systems that control devices were far apart with devices that under control. LED is essentially a kind of current devices. The combination of electron-hole pairs can emit photons. When increasing the input current, the compound speed and output luminous flux will also be raised. Definitely, the efficiency of this process cannot reach up to 100%, thus the a certain proportion of electrical energy will convert into heat. Unless in very poor working conditions, LED Lights will not break down like incandescent lamps does. But working in a over-heated condition for a long time will also accelerate the light attenuation of LEDs and consequently the service life.