Patent ID: 8063574

Claim:
Alight emitting diode illuminating device, comprising: a light emitting diode (LED) light source; a heat dissipating device thermally connected to the LED light source; a temperature detector thermally connected to the LED light source, the temperature detector being configured for detecting the working temperature of the LED light source; a power supply; and a pulse width modulator, the power supply being electrically connected to the pulse width modulator for providing electric power to the pulse width modulator, wherein the pulse width modulator is configured for operating at a direct current (DC) output mode, if the working temperature detected by the temperature detector is lower than a predetermined temperature, where the pulse width modulator provide a direct current or a direct voltage to the LED light source; or at a pulse output mode, if the working temperature is higher than or equal to the predetermined temperature, where the pulse width modulator provide a pulse current or pulse voltage to the LED light source.