How to choose good LED lamps
LEDs last because they don't have problems with blown filaments. The LED doesn't stop functioning outright, but it does gradually degrade over time. Generally, LEDs can be used for more than 50,000 hours, and their luminous intensity will gradually drop from the nominal value to about 70%. The main reasons for affecting the life of LEDs are the following three components: light source, power supply and housing.
1. Light source
The quality of the LED chip is an important factor affecting the life, and the design and material of the chip can affect the life of the LED. LED packaging technology is also an important factor affecting the life of LEDs. A reliable packaging manufacturer has a great relationship with the life of LEDs.
2. Design of the power supply
Because of the strong discreteness of LEDs, the voltage drop, wavelength, light color, and height are very different. Only LEDs with the same indicators above can be used in parallel. On the contrary, the current of the voltage drop is large, and the current of the high voltage drop is very small. Causes uneven light color and height, and shortens the life of high current. The life of the power supply itself is also an important reason. Generally, electrolytic capacitors have a lifespan of 8,000 hours at 105°C, 15,000 hours at 40-60°C, and 30,000 hours without electrolytic capacitors.
3. Heat dissipation design
Heat dissipation is one of the important reasons affecting the life of LEDs. The light-emitting of LEDs needs to be driven by current. Only about 15% of the electrical energy input to the LEDs is effectively converted into light, and most of them (about 85%) are converted into heat due to ineffectiveness. Among them, the ambient temperature is very important, and the ambient temperature can affect the change of the heat dissipation temperature of the LED lamps by 5~20 degrees.
1. Heat dissipation
The heat build-up of LED lamps not only affects the electrical performance of the LED, but may also eventually lead to the failure of the LED. Therefore, in order to ensure the life of the LED lamp, heat dissipation has become a key technology in the application of white light LEDs, and reducing or rapidly dissipating the heat generated by the LED has become the primary issue in the application design of white light LEDs.
2. Light source material
LEDs are point light sources. If poor LEDs are used, the LEDs will emit a lot of heat during operation, causing the die junction temperature to rise rapidly. The higher the LED power, the greater the heating effect. The increase in LED chip temperature will This leads to changes in the performance of light-emitting devices and attenuation of electro-optical conversion efficiency, and even failure in severe cases.
3. Drive power
The quality of the LED power supply directly restricts the reliability of the LED products. Therefore, foreign customers in the international market have very high requirements for the efficiency conversion, effective power, constant current accuracy, power supply life, and electromagnetic compatibility of the LED drive power supply. The role of lamps is as important as the human heart.
4. Drive current
The greater the current flowing through the LED within its current limit parameters, the higher its luminous brightness. That is, the brightness of the LED is proportional to its operating current. But if the current flowing through the LED exceeds the limit parameter range, the LED will Saturation will occur, which not only greatly reduces the luminous efficiency, but also shortens the service life.
Five, light distribution processing
LED is a directional point light source. How to creatively apply this feature of LED to create a comfortable light environment is the core of LED lighting design technology. The LED light source itself generally has a lens or a transmission material, which is used to improve the light output efficiency and meet the light distribution distribution of about 120 degrees of light output, which is generally called a primary optical design. However, in order to meet the various needs of indoor lighting, it is necessary to redistribute the light according to the needs, and how to redistribute the light emitted by the LED to achieve a comfortable light environment also affects the LED products.
important factor in quality.
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