Patent ID: 8317372

Claim:
An LED bulb 2 , comprising: a circuit board 21 having a first surface and a second surface opposite to the first surface; a plurality of LEDs 22 disposed on the first surface of the circuit board; and a heat dissipating structure 23 having a heat dissipating board, wherein the heat dissipating board has a third surface and a fourth surface opposite to the third surface, the third surface is attached to the second surface of the circuit board, and a plurality of heat dissipating bumps are disposed on the fourth surface and gradually decrease in length from a center toward a periphery of the fourth surface; a cover 25 engaged on top of housing 24 to form the closed LED bulb, wherein the cover has no opening on the top, wherein the LEDs are positioned upwards and covered by the cover; and said housing 24 disposed around the circuit board and the heat dissipating structure, wherein the heat dissipating structure is positioned downwards in the housing, wherein the housing has a plurality of openings 240 positioned around the heat dissipating structure in such a way as to draw the heat away from the LEDs on the circuit board through the heat dissipating structure and out of the heat dissipating space through the openings in the housing via air convection in all directions.