Due to their high efficiency and significant energy saving potential, LEDs are being developed as lighting sources. Since the total luminous flux generated by a single LED is considerably lower than other light sources, the total light output must be increased with higher forward currents and packages of multiple LEDs to be competitive. However, both of these solutions increase the junction temperature, which degrades the performance of the LED. Furthermore, as the operating temperature goes up, the light intensity decreases, the lifetime is reduced, and the light color changes.