3.4 LED performance

The use of LEDs has been increasing dramatically over the last few years. At the beginning, heat dissipation from LED junction was not a problem because low-power LEDs were used. However, modern high-power LEDs dissipate much higher portion of heat which has to be removed from the junction in order to maintain high efficacy, reliability and lifetime of LED-based light source.

Basic parameters to evaluate LED performance are (Figure 3.4.1):

•    Junction temperature – Tj
•    Thermal resistance – Rj-a

Junction Temperature Thermal resistance

Figure 3.4.1:
Basic parameters to evaluate LED performance.

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