Dec. 08, 2020
The reason why LED is durable is that it does not produce filament fuse. The LED will not stop running directly, but will gradually deteriorate over time. Generally, LED can be used for more than 50,000 hours, and its luminous intensity gradually decreases from the nominal value to about 70%. The main factors affecting the life of LEDs are the following three parts: light source, power supply and housing.
Because Environmentally Friendly Led Lights have strong discreteness, their pressure drop, wavelength, light color and height are very different. Only LEDs with the same index can be used in parallel, and the high voltage drop current is very small. The high voltage drop current is very small, and the color and height of the light are uneven, which shortens the service life of the current. The life of the power supply is also an important reason. The service life of the electrolytic capacitor is 8000 hours at 105℃, the service life of the capacitor is 15000 hours under the condition of 40～60℃, and the electrolytic capacitor can maintain 30,000 hours.
The quality of LED chips is an important factor affecting life. At the same time, the design and material of the chip will also affect the service life of the LED. LED packaging technology is also an important factor affecting LED life. A reliable packaging manufacturer has a great relationship with LED life.
Heat dissipation is one of the important factors affecting LED life. The emission of LED requires current drive. Of the LED power, only about 15% can be efficiently converted into light, and most (about 85%) are converted into heat due to low efficiency. The ambient temperature is very important. The ambient temperature will affect the 5-20 degree heat dissipation of the LED lamp.
The heat accumulation of the LED Lamp not only affects the electrical performance of the LED, but also affects the failure of the LED. Therefore, in order to ensure the service life of LED lamps, heat dissipation has become a key technology in white LED applications. In the application design of LED white light, quickly reducing or dissipating the heat generated by the LED becomes the primary problem.
The quality of LED power supply directly restricts the reliability of LED products. Therefore, the international market has very high demand for efficiency conversion of LED drive power, effective power, constant current accuracy, power supply life and electromagnetic compatibility in the international market, because the function of the power supply in the entire lamp is as important as this. The human heart.
The greater the current flowing through the LED within its current limiting parameter range, the higher its brightness. In other words, the brightness of the LED is proportional to the operating current. However, if the current through the LED exceeds the limit parameter range, the LED will be saturated, which not only reduces the luminous efficiency significantly, but also reduces the service life.
LED is a point light source. If a poor LED is used, the LED will release a large amount of heat during operation, causing the core junction temperature to rise rapidly. The higher the LED power, the greater the thermal effect, and the higher the temperature of the LED chip. This leads to changes in the performance of light-emitting devices and attenuation of electro-optical conversion efficiency, or even failure.
LED is a directional point light source. How to creatively apply this characteristic of LEDs and create a comfortable light environment is the core of the optical design technology of LED lights. Linear Led Lighting itself usually has lenses or transmissive materials to improve light emission efficiency and meet a light distribution of about 120 degrees. It is often referred to as optical design. However, in order to meet the needs of indoor lighting, it is necessary to redistribute the light as needed and distribute the light emitted by the LED twice to achieve a comfortable light environment, which is also an important factor affecting the quality of the LED.