Incorporates a voltage control circuit to efficiently control voltage at the base lamp regardless of battery terminal voltage. Efficiently regulates the voltage at the Paglight base to 12 VDC, regardless of battery voltage, thereby extending battery run time up to 25%, and dramatically improving lamp filament life while achieving a constant and correct color temperature output. Can be used with all 12 VDC halogen lamps. Fits into the back of the lamp body enabling variants of unit type or wattage to be changed without changing the bulb: