Patent ID: 8408747

Claim:
A light-emitting device comprising: a heat-dissipating base having a solid structure and including a top portion and a bottom portion, the bottom portion of the heat-dissipating base comprising an exposed heat-dissipation surface; a light-emitting unit over the top portion of the heat-dissipating base so as to provide heat conductivity at least from the light-emitting unit to the heat-dissipating base, the light-emitting unit comprising: at least one light-emitting diode for emitting light, with heat being generated as the at least one light-emitting diode emits light, the at least one light-emitting diode having power input terminals for receiving power input to the at least one light-emitting diode, the power input comprising one of an alternating-current input and a direct-current input; and a first electrode and a second electrode, the first electrode and the second electrode being electrically coupled with the input terminals of the at least one light-emitting diode; a housing enclosing at least a portion of the light-emitting unit, the housing covering at least the top portion of the heat-dissipating base; and a first conductive contact and a second conductive contact, the first conductive contact and the second conductive contact being configured to receive an external power supply, the first conductive contact being electrically coupled with the first electrode and the second conductive contact being electrically coupled with the second electrode, the first conductive contact and the second conductive contact being disposed at a location near or below a portion of the heat-dissipating base, wherein the heat-dissipating base has a ventilating hole connecting a space inside the housing and an outside space to allow air from the outside space into the space inside the housing to reach and dissipate heat generated by the light-emitting unit.