Light-emitting diode stacked lighting core for lamp bulb

A light-emitting diode stacked lighting core comprising a core top board, a core bottom board, conductor lines connecting the core top board and the core bottom board, a plurality of vertical boards, a plurality of light-emitting diodes, a plurality of rectifiers, and a voltage reduction element, wherein the core top board, the core bottom board, and the vertical boards are all embodied as circuit boards, the core top board and core bottom board are separated from each other by an interval, the vertical boards are mounted vertically in the interval between the core top board and the core bottom board so that the core top board, the core bottom board and vertical boards cooperate to define a hollow space therebetween, the core top board and the vertical boards each having an outside surface on which the light-emitting diodes are arranged, the circuit boards being further provided with the rectifiers at suitable locations, the core bottom board being provided with a circuit that is formed of one of the rectifiers and the voltage reduction element and having two terminals extending downward beyond the core bottom board for coupling with a base of an outer enclosure;

• and wherein opposite ends of each vertical board form extended fitting tabs and the core top board and the core bottom board respectively form openings corresponding to the fitting tabs to receive the fitting tabs to fit therein and to be fixed thereto by means of soldering, whereby the light-emitting diodes of the core top board and the vertical boards are put in electrical connection with each other to form the lighting core that is receivable and fixed in the enclosure.