Lighting device for multiple input voltages

A lighting device for multiple input voltages, comprising:

• a light-emitting unit, which has a plurality of light emitting diode (LED) lamp strings, one of the LED lamp strings including a plurality of alternating-current (AC) LEDs;
• and
• a plurality of driving circuits for emitting light, each being electrically connected with the light-emitting unit, wherein one of the driving circuits receives an AC input voltage different from other AC input voltages, converting the AC input voltage into a working voltage for use by the light-emitting unit;
• wherein each of the driving circuits includes:
• a surge protection device for inputting the AC input voltage;
• and
• a rectifier being electrically connected with the surge protection device, and rectifying the AC input voltage into the working voltage through the surge protection device for use by the light-emitting unit;
• wherein a threshold voltage provided by each of the surge protection devices of the driving circuits to prevent a surge is different from each other, so that the AC input voltage received by the driving circuits are different from each other, and the high-voltage protection ranges provided by the surge protection device in each of the driving circuits against surges are different from each other.