Patent ID: 6873110

Claim:
An HID single light emitting point lamp tube switching device for switching the lamp tube between a far light position and a near light position; the HID single light emitting point lamp tube having a light emitting point therein, initially the HID single light emitting point being positioned in a first position; comprising: a first relay having a first coil and a first pair of joints; the first coil being connected to a switching for switching the lamp tube between a far light position and a near light position; a second relay having a second coil and a second pair of joints; a strong current coil having a first end connected to one joint of the second relay and a second end connected to a power source; the strong current coil being magnetically coupled to the light emitting point in the HID single light emitting point lamp tube; a weak current coil having a second end connected to one joint of the first relay and a second end connected to a power source; the current provided by the weak current coil being weaker then that of the strong current coil; the weak current coil being magnetically coupled to the HID single light emitting point; a timer having an output connected to second coil in the second relay; one input of the timer being connected to the second end of the strong current coil; and another input of the timer being connected to the other joint of the pair of joint of the first relay; wherein by the current from the strong current coil and the weak current coil, the HID single light emitting point is magnetically induced so as to move to a second position; when the switch is positioned to cause the first coil to conduct, the strong current coil and weak current coil are induced at the same time, so that the HID single light emitting point are moved to the second position, and at end of a time period set in the timer, the strong current coil will be interrupted, so that only the weak current coil is actuated to maintain the HID single light emitting point in the second position; wherein the first position is a far light position which cause the HID single light emitting point to emit far light, and the second position is a near light position which cause the HID single light emitting point to emit near light; and wherein the second position is a far light position which cause the HID single light emitting point to emit far light, and the first position is a near light position which cause the HID single light emitting point.