The instant invention relates to a solid state low voltage power supply controller which reduces a conventional 120 volt AC power source to 12 volt pulsating DC for the purpose of operating a single "point of use" light source wherein the low voltage power supply is in proximate location to the light source. A pulse width modulator integrated circuit operating in conjunction with a field effect transistor induces energy in the secondary of a step-down transformer to provide a reduced pulsating DC current to a lamp load. A feedback voltage from the secondary winding of the stepdown transformer operates to set the gain of internal circuitry of the integrated circuitry to provide a predetermined constant pulsating DC voltage and a predetermined limited range of power wattage. A feedback voltage operates to reduce current drawn by overcurrent demands on the primary of the transformer.