Patent ID: 8322889

Claim:
A lamp comprising: a light emitting diode device; a heat sink in thermal communication with the light emitting diode device; a channel having an inlet, an outlet and a constriction disposed along the channel between the inlet and the outlet, the heat sink defining at least a portion of the channel; a piezoelectric element; a blade including a free end and an attached end, the blade being disposed in the channel and connected to the piezoelectric element, wherein the piezoelectric element is activated to move the blade side to side in the channel to create air vortices, the constriction in the channel and the blade cooperating with one another such that a vortex that is generated as the blade moves toward a first side of the channel is compressed against the first side of the channel and expelled towards the outlet of the channel; wherein the outlet of the channel has a cross-sectional area Ao and the channel has a cross-sectional area A upstream from the outlet, wherein Ao<A; and wherein the channel has a cross-sectional area Ac at a narrowest point of the constriction, wherein Ao<Ac.