Abstract: The present disclosure is directed to an apparatus for extending useful life of barricade warning light. The apparatus comprises a light source; a battery having an output voltage; and an oscillator circuit connected to the battery. The oscillator circuit drives the light source in either a first or alternate mode, wherein the first mode the light source flashes within a desired flasher frequency range and the alternate mode the light source is continually illuminated. The oscillator biased such that the oscillator circuit automatically switches from the first mode into the alternate mode at an optimal value for the battery output voltage. A method for extending useful life of barricade warning light is also disclosed.