Electric lamp circuit and structure using light emitting diodes

An electric lamp circuit comprising a light emitting circuit (41) including a plurality of LEDs (D11..DMN) arranged in a matrix form of M rows x N columns, a power source (42) for supplying an AC voltage to the light emitting circuit, and a variable resistor circuit (43) for adjusting the amount of current flowing to the light emitting circuit (41). The LEDs (D11..DMN) are arranged in a net form. Therefore, eventhough a specific one of the LEDs (D11..DMN) fails, the other LEDs of the same row can normally be turned on. As a result, the failed LED is readily distinguishable, resulting in a reduction in failure repair working time. Further, a variation in the AC voltage is compensated so that the amount of current flowing to the light emitting circuit (41) can be maintained within a predetermined range. Therefore, a lighting failure of the light emitting circuit (41) can be avoided and overcurrent can be prevented from flowing to the light emitting circuit (41). These have the effect of extending the product's life span. Moreover, an ambient brightness of a lamp is sensed and a light intensity of the light emitting circuit (41) is adjusted in accordance with the sensed result, thereby reducing power consumption. Further, a circuit regenerator (79, 88) is provided to, eventhough all LEDs of a specific column fail, transfer current to LEDs or the subsequent column, thereby preventing operation incapability.