MCPCB

Nowadays, the hottest consumer application in MCPCB is LED. That’s because the dissipation of heat is getting more attention from the designer. The reason is that both lifespan and luminous decay of LED are all directly linked to the junction temperature of the LED. Moreover, the led junction temperature is also related to energy consumption. According to an experiment conducted by Cree, the time for luminous decay drop to 70% is 100 thousand hours if the temperature is kept at 65 Celsius. Many tests have proved that LED generates heat is because electricity input cannot completely transform to light but heat. The luminous efficiency of LED is about 100lm/W. The electricity-luminous conversion ratio is only between 20~30%. That means about 70% of current input turns into heat. By reducing heat generated, we can increase luminous efficiency and conserve energy.