A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting as their brightness increases. Introduced in , early LEDs emitted low-intensity red light, but modern versions are available across visible, ultraviolet, and infrared wavelengths, with very high brightness levels.
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All LEDs have at least one anode, or positive lead, and one cathode, or negative lead. Sometimes there is more than one in order to accommodate dual colors or multiple chips in one LED package. There is always a flat spot or notch to denote the cathode side. The anode is connected to the post, and the cathode is connected to the anvil, which holds semiconductor die, where the light is actually produced.
When a light-emitting diode is switched on, electrons are able to recombine with electron holes within the device, releasing energy in the form of photons, or light. This effect is called electroluminescence, and the color of the light is determined by the energy gap of the semiconductor. Integrated optical components may be used to shape the radiation pattern of the light. LEDs have many benefits compared to standard light sources, including lower energy consumption, longer life, improved physical robustness, smaller size, and faster on/off switching.
To use LEDs in automotive applications, multiple LED chips are designed into a bulb assembly, and wired in order to provide the necessary voltage and current to run the bulbs reliably. The use of LED can provide longer-lasting, brighter, more reliable bulbs when compared to standard bulbs.
LEDs are designed to emit specific wavelengths of light, which is interpreted as different colors by the human eye. This is determined by the material that makes up the p-n junction on the LED, where the electrons jump and emit photons of light. The most common materials used are AlGaInP and InGaN. There is no actual "white" color wavelength, so to create white light, a blue LED is topped with a material that emits yellow wavelengths, the combination of which produces a white color to the human eye. This is why most white LEDs have a yellow color when they are off.
Automotive LEDs are offered in many different colors. When shopping for LED bulbs for your exterior, be sure to check your state's laws on colored bulbs in your vehicle. Many states do not allow for colored bulbs on the exterior of the vehicle, such as the licence plate lights. It is also important to purchase the bulb color that matches the color of your housing to allow for the effective transmission of the proper color wavelength through the reflector. For example, if your sidemarker has an amber housing, you would want to purchase an amber bulb, not a white bulb.
Ok, let&#;s go straight to our topic today, top secret of led chip.
When you were asking the LED chip for the led outdoor flood lights, led high bay lamp, led panel light or other led products. Usually, you will get the follow answer
1) Epistar chip, this is the most common answer you get from the salesmen
2) Cree, Citizen, Nichia
3) Philips Chip
4) Bridgelux chip
5) San&#;an Chip
We will analyze them one by one, so that you can understand the secret of led chip.
Epistar chip
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If the manufacture told you that the chip is from Epistar. Possibly, he was lying to you. Because they actually was using San&#;an. So, why the manufacture cheat their clients?
It is because most clients will think that Epistar chip is more reliable, but the truth is that San&#;an chip has the same quality as Epistar chip for general lighting. So, you don&#;t worry about the quality and stability. Actually, San&#;an is the biggest led chip manufacture in China mainland.
Cree, Citizen and Nichia Chip
If the manufacture told that their products were using Cree , Citizen or Nichia chip, they are telling you the truth. You don&#;t need to doubt that, because the price of those chip are higher than others, and it is easy to buy these led. There is no need to cheat you.
Bridgelux chip
This chip is more common on the COB, and it is a big brand from USA. There is only one thing you need to pay attention on Bridgelux. When someone was telling that it is from Bridgelux chip, it is better that you ask him one more question. Is the package also by Bridgelux ? Because the price would be different if the package was doing by Bridgelux.
Philips Chip
Today, many many led manufacturers are using Philips SMD on their products, high bay led retrofit bulbs, led flood light bulbs, and other industrial lighting. And many big China package factories also produce this type of SMD with very reliable quality.
So, you can relax that if the manufactures told you that they are using Philips SMD.
San&#;an Chip
This is the biggest Chip manufacturer in China mainland. If a salesman was telling you that they are using San&#;an chip, congratulation, you are meeting a honest man, and I think he is very confidence on the quality of their product. Just give him a chance and try their product.
Some of you will say, ok, now I already know about those chip after reading this article. But, how can I recognize the chip exactly ?
The best and the only reliable way is to send the sample to the original manufacturer, and asking them to help to check the authenticity. But this procedure will take you a long time, and not every company provide the service.
So, for the general lighting product, our suggestion is that just try to buy some samples to test, no matter what kinds of chip, the technology is already very mature. There is no need to pay much worry on that.
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