Patent ID: 8371717

Claim:
An LED light emitting device, comprising: a lamp housing; an LED light emitting component thermally attached to the lamp housing, wherein the LED light emitting component comprises a heat conductive plate and a plurality of LEDs thermally attached to the heat conductive plate; a power source driver for providing electric energy for the LED light emitting component; a temperature sensor attached to the lamp housing for sensing a surface temperature of an outer surface of the lamp housing; a heat sink thermally connecting the LED light emitting component and the lamp housing, the heat sink comprising a base and a plurality of fins extending outwardly from the base, the base having a semicircular cross section and comprising a planar face and a curved face at an outer circumference of the heat sink, the LED light emitting component being thermally attached on the planar face of the base, the fins being arranged on the curved face of the base and extending spirally along an axis of the base; and a connecting head extending from an end the heat sink, the connecting head electrically connecting each of the LEDs of the LED light emitting component with the power source driver, the lamp housing comprising a main body and an engaging body extending from an end of the main body, the main body having an arced configuration and comprising a curved inner face recessed inwardly, a plurality of inner threads being defined in the inner face of the main body, an engaging hole being defined in the engaging body, the connecting head being inserted into the engaging hole of the engaging body, the fins of the heat sink being threadedly engaged with the inner threads of the main body; wherein when the value of the surface temperature is smaller than a predetermined temperature value, the temperature sensor outputs a control signal to the power source driver to control the power source driver to supply a larger electric current to the LED light emitting component, and the LED light emitting component generates more heat to the lamp housing to increase the surface temperature thereof.