Thermally conductive material development factory analysis of temperature will affect the LED light decay, its analysis of the use of dimming technology to reduce the output power will significantly improve the working environment of LED lamps and lanterns, extend the life of the lamps and lanterns to improve reliability. The key factor affecting the reliability of LED lamps and lanterns is the temperature. Whether it is the LED driver power supply or LED chips, the higher the ambient temperature, its life and reliability will drop sharply. Figure 1 shows the relationship between the life of the LED driver power supply and temperature, when the ambient temperature is 25 ℃ LED power supply life up to 320,000 hours, while when the temperature rises to 60 ℃, LED power supply life will be shortened to only 35,000 hours.

After testing found that the higher the temperature, the LED chip light decay is also significantly increased. LED light decay and its junction temperature is closely related to the so-called junction temperature is the temperature of the semiconductor PN junction, the higher the junction temperature, the earlier the LED light source light decay, is the shorter the life. If the junction temperature of 105 ℃, brightness down to 70% of the LED light source life of only 10,000 hours; junction temperature of 95 ℃ when the LED light source life of 20,000 hours; and junction temperature reduced to 75 ℃, life can be up to 50,000 hours, 65 ℃ when the life can be extended to 90,000 hours. In summary, the key to extending the life of the LED light source is to reduce the junction temperature. Currently, there are thermally conductive silicone grease and thermally conductive double-sided adhesive widely used in LED products, electronics, electrical, power modules, backlighting and other fields, its thermal conductivity can meet the needs of heat dissipation for high-power LED applications, and can provide a complete set of heat treatment design solutions.

As the output power decreases, the drive power supply's own losses will also decrease, and its case temperature will also decrease. 200W LED drive power supply output power and case temperature curve. When the ambient temperature is 25 ℃ full-load output, the shell temperature of 50 ℃, and the use of dimming technology to control the output of only 50% of the power, the shell temperature drops to 40 ℃, the life will be doubled, reliability can be increased by 25%-40%. Traditional incandescent or HID due to the inability to dimming, the seventies, Japan's energy crisis, the use of interval lighting method to try to save energy. However, due to uneven illumination of the road, resulting in visual problems for passers-by, security and road traffic accidents rose sharply, and finally had to give up the interval lighting method. The rapid development of dimming technology will bring LED lighting dimming system into a new field, so that the green environmental protection and energy saving LED lighting applications for a wide range of popularization and promotion.