Patent ID: 7157859

Claim:
A lighting device that allows a plurality of light emitting diodes to light up, the plurality of light emitting diodes including a first light emitting diode and a second light emitting diode that are connected in series, the lighting device comprising: current setting sections that are connected in series to the first light emitting diode and the second light emitting diode respectively to constitute a first serial circuit and a second serial circuit, the current setting sections setting a forward current value flowing through the first light emitting diode and the second light emitting diode; and a first shunt section and a second shunt section that are respectively connected in parallel to the first serial circuit and the second serial circuit, the shunt sections each shunting a current when a voltage higher than a rated voltages of each of the light emitting diodes of the serial circuits is applied to each of the serial circuits, wherein the first and second shunt sections include a first Zener diode and a second Zener diode respectively, the first and second Zener diodes being connected in parallel to the first and second serial circuits respectively, and Zener voltages of the first and second Zener diodes are different from each other.