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ORED Lighting Applied the latest LED – Cooling and Thermal Management Design in LED Lights

Release time:2015-05-08

As we all know, the life span of an LED depends on the semi-conductor material used as well as the current/heat relationship. The light output of the LED becomes weaker and weaker and once it reaches 50% of its initial value, the life expectancy of the LED has, by definition, been reached. A life span of a few hundred and up to 100,000 hours is possible, but only when avoiding high temperatures which drastically reduce the length of the LED’s life.

The radiant power or the luminous flux of an LED is very much dependent on the temperature of the semi-conductor. This means that the efficiency of the LED clearly diminishes the higher the temperature is.

Even when an LED is referred to as a “cold radiator”, the entire electric energy in the LED is not converted into luminous power. Here, just like other semi-conductors, a large portion of the electric energy (70%-80%) is converted into heat. This is why; unlike thermal radiators (light bulb) thermal management (cooling) is absolutely necessary. The effectiveness or in other words, the efficiency of the LED is the relationship of radiated luminous flux to applied electrical energy and is specified in Lumens per Watt (lm/W).

Figure 1 Illustration of the latest LED cooling design

The above picture shows the latest cooling design applied in our high power LED lights. By using the ø 6mm heat pipe, the heat generated by the lighting quickly transfers to the cooling module of massive radiation fins, efficiently reduce the temperature of the LED lighting chips and extend the lifespan of the lighting source. The heat conductivity hereby reaches 383.8 w/m℃,which significantly reduces the temperature and lengthens LED lifespan.