The development of all things follows its natural laws. Halogen lamps are banned in the European Union, and LED headlights have also been pushed into a new wave. Even so, some car owners still think that halogen lamps are better，they like halogen lamps because halogen lamps have strong penetrating power, which is one of the few advantages of halogen lamps. Even so, it does not mean that LEDs are not as good as halogen lamps in terms of penetration. Penetration and color temperature are related to light. When installing car lights, just do not install too white light. If you are still worried, you can install color-changing lights, which are suitable for all-weather use.
Everyone knows that the rise of semiconductor materials in the LED field has been truly remarkable. Like all things, there are inevitably pros and cons, and the downsides of semiconductor materials are quite evident. Semiconductor materials that require stable operating environments due to high environmental temperature demands are a clear drawback. LEDs are no exception to this rule.
Analysis of LED car headlight decay
It is undeniable that LED car headlights boast an extended lifespan, often reaching up to 30,000 hours, surpassing the longevity of traditional light sources by several folds. They typically do not necessitate frequent replacements. Additionally, they are energy-efficient, environmentally friendly, radiation-free, and exhibit a quick response time. Their compact dimensions offer enhanced versatility in design, leading to a diverse range of shapes.
LED car headlights have become the mainstream choice in automotive lighting nowadays. High-power LEDs in these headlights have a notably low energy conversion efficiency. Typically, only 10%-25% of the electrical energy in car LEDs is transformed into light, with the rest being converted into heat. While traditional halogen lamps generate more heat than LEDs, their output brightness remains stable regardless of heat. Their heat design primarily focuses on maintaining uniform temperature inside the housing. However, the light output of LEDs can be affected by their own heat generation or the high temperatures in the engine compartment, impacting the stability of the PN junction temperature. Crucial parameters like LED light flux and wavelength are directly influenced by the PN junction temperature. This unfavorable temperature cycle can lead to a decrease in luminous efficiency and a rapid decrease in lifespan, commonly known as light decay.
So, how do we tackle the issue of light decay caused by high temperatures? There are two main methods: designing effective heat pathways and using materials with excellent thermal conductivity.
I look forward to delving into the detailed explanation of the hot channel design in the next article, as well as providing recommendations for three materials known for their excellent thermal conductivity.
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