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LED taillights are innovative brake lights and taillights that use long-lasting LED light sources. They can signal other vehicles and pedestrians when a car is braking, turning or turning. LED taillights have excellent light source intensity and can maintain extremely high visibility even in foggy days.
Compared with traditional lamps, light-emitting diodes (LEDs) have a series of technical advantages, among which extremely short response time and long service life are the most important advantages. Seeing the brake lights of the car ahead in time can help reduce the driver's stopping distance. For example, when braking at a speed of 100 km/h under the same conditions, seeing the brake lights of the car ahead in time can reduce the driver's stopping distance by about 5.5 meters.
LED tail light features
The most ideal LED light source to replace traditional light sources has a wide range of uses. Summarize its ten major features:
1: Energy saving - LED car lights are cold light sources. Generally speaking, they consume low power and consume no more than -W. They save more than 70% energy than traditional light sources.
2: Environmental protection - there are no ultraviolet and infrared rays in the spectrum, no heat or radiation, small glare, and the waste is recyclable, no pollution, no mercury elements, safe to touch, and is a typical green lighting LED source.
3: Long life - there are no loose parts in the lamp body, and there are no shortcomings such as filament burning, heat deposition, light attenuation, etc. Under the appropriate current and voltage, the service life can reach 60,000-100,000 hours, which is longer than the life of traditional light sources. More than 10 times longer.
4: High brightness, high temperature resistance.
5: small size.
6: Good stability, LED has strong shock resistance: resin encapsulated, not easy to break, easy to store and transport.
7: High luminous purity, bright colors, no need for lampshade filtering, and light wave error within 10 nanometers.
8: The response speed is fast, no hot start time is required, and the light can be emitted within microseconds. The traditional glass bulb has a 0.3 second delay to prevent rear-end collisions.
9. The meaning of limit parameters
(1) Allowable power consumption Pm: the maximum value of the product of the forward DC voltage applied to both ends of the LED and the current flowing through it. If this value is exceeded, the LED will become hot and damaged.
(2) Maximum forward DC current IFm: the maximum forward DC current allowed. Exceeding this value can damage the diode.
(3) Maximum reverse voltage VRm: the maximum allowed reverse voltage. Exceeding this value, the LED may be damaged by breakdown.
(4) Working environment topm: the ambient temperature range in which the light-emitting diode can work normally. Below or above this temperature range, the light-emitting diode will not work properly and its efficiency will be greatly reduced.
Advantages and Disadvantages of LED Tail Lights
Advantage
1: Long life, generally up to tens of thousands or even hundreds of thousands of hours. Some people think that if future car lighting uses LED, there will be no need to replace lamps throughout the car's service life.
Two: high efficiency and low energy consumption. LED light sources can directly produce red, amber and other colors required by automobile lamps without color filtering, without loss, and the power utilization rate is as high as over 80%.
Three: The light quality is high, it is an environmentally friendly product with basically no radiation, and it is a "green" light source.
Four: The structure of LED is simple, with an internal bracket structure, sealed with transparent epoxy resin around, and has good earthquake resistance.
Five: There is no delay in lighting, and the lighting response speed is fast (nanosecond level), suitable for use with fast-moving objects.
6: Suitable for low-voltage operation and can be used in automobiles.
Seven: LED occupies a small space, and designers can change the lamp mode at will to diversify the car's shape. Automobile manufacturers favor LED, which is entirely determined by the advantages of LED itself.
Shortcoming
1: The cost is high. Taking LED reversing lights as an example, an LED reversing light costs nearly 30 yuan, while a light bulb costs only 3 yuan, most of which is the cost of the LED light. The high price makes it impossible for ordinary cars to install LED lights, and the market cannot be promoted.
2: It is difficult to popularize LED car headlights. They have poor heat dissipation and are prone to light decay if heat dissipation is not handled properly. Affects the service life of car lights.
3: There are no industry standards and product quality is uneven;
4: Light pattern design is a little difficult;
5: Not suitable for long-term lighting. If lighting is used for a long time, simple heat dissipation design should be considered;
6: Poor maintenance performance;
7: The point light source makes the appearance of the lamp have a certain gap from the light bulbs we are used to, and people's acceptance is challenged.
LED tail light characteristics
1. Reliability and service life
2. Efficiency/lumens per watt
Compared to standard incandescent lamps, LEDs produce more light output per unit of electricity consumed. But when compared to halogen lamps, the actual light output advantage of LEDs is not obvious. The latest LEDs have excellent lumens-per-watt values, but some of these values are achieved under optimized conditions and usually not at the highest output conditions. Generally speaking, when the current of an LED increases, the light output does not increase linearly. So even if the LED outputs x lumens at 0.5A, it won't output 2x lumens at 1.0A.
3. Response speed
Taking brake lights and direction indicator tubes as an example, assuming the vehicle speed is 125 kilometers per hour, that is, 35 meters per second, the hot start time of the incandescent lamp is about 250 milliseconds, and the fast-responsive LED can emit light about 8 meters earlier. Brake warning to effectively avoid car collision. The same goes for indicator lights.
4. Directionality
Another key feature is the way the LED emits light. Unlike incandescent lamps, LEDs emit light only through one surface, which is good for headlights and chart lighting applications, but may not be suitable for other lighting applications such as cabin lighting.
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