We study the thermal behavior of white LEDs by using the efficient stable thermal model. The sample of white LEDs with a correlated color temperature of 6500 K is utilized in this study. The relation of forward current on the thermal behavior in encapsulanted volume is studied in both theoretical and empirical ways. Simulation and experimental results have indicated the advantages of the thermal model not only in studying thermal behavior but also in thermal management and packaging of white light-emitting diodes.