Necessity of LED lighting dimmingon July 6th, 2012 at 8:55 AM
Dimming technology to reduce the output power will be significantly improving the working environment of LED lamps and extended lamp life, led light word controller to improve reliability. A key factor to affect the reliability of LED lighting is the temperature.150w LED Red, the higher the ambient temperature, its life and reliability will be a sharp decline. For the power of life and temperature relationship of the LED driver, LED power supply life up to 320,000 hours when the ambient temperature of 25 ° C, when the temperature rose to 60 ° C, the life of the LED power supply will be reduced to only 35,000 hours.
The higher the temperature, the LED 300w chip, the light fades significantly exacerbated. Figure 2 for the Cree’s LED light source light decay curve. It can be seen from the figure LED light decline and its junction temperature is closely related to the so-called junction temperature is the temperature of the semiconductor PN junction, the junction temperature the higher the 50W LED Flood Lights 12-24v source the sooner the light fades, that is, the shorter the life. Can be seen from the chart, if the junction temperature of 105 ° C, the brightness down to 70% of the LED 100w source life of only one thousand hours; junction temperature of 95 ℃, the LED source life, 20,000 hours; junction temperature reduced to 75 ° C , can be a long life of 50,000 hours at 65 ° C, life can be extended to 90,000 hours. In summary, to extend the life of the LED light source LED floodlights controller the key is to reduce the junction temperature.